Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes

Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states invol...
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Autor*in:	A M Steane [verfasserIn] J P Home T P Harty D J Szwer S C Webster D N Stacey D M Lucas D T C Allcock N M Linke V M Schäfer C J Ballance D P L Aude Craik

Format:	Artikel
Sprache:	Englisch

Erschienen:	2015

Schlagwörter:	Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics

Übergeordnetes Werk:	Enthalten in: Nature - London : Macmillan Publishers Limited, part of Springer Nature, 1869, 528(2015), 7582, Seite 384
Übergeordnetes Werk:	volume:528 ; year:2015 ; number:7582 ; pages:384

Links:	Volltext Link aufrufen Link aufrufen Link aufrufen

DOI / URN:	10.1038/nature16184

Katalog-ID:	OLC1969652438

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520			\|a Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing.
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allfields	10.1038/nature16184 doi PQ20160211 (DE-627)OLC1969652438 (DE-599)GBVOLC1969652438 (PRQ)a2089-5309685a8de6bcfa57a65d0c98eb3852cee2c722c1519b9eae2bc05115f433690 (KEY)0072945020150000528758200384hybridquantumlogicandatestofbellsinequalityusingtw DE-627 ger DE-627 rakwb eng 070 500 DNB 500 AVZ BIODIV fid A M Steane verfasserin aut Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing. Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics J P Home oth T P Harty oth D J Szwer oth S C Webster oth D N Stacey oth D M Lucas oth D T C Allcock oth N M Linke oth V M Schäfer oth C J Ballance oth D P L Aude Craik oth Enthalten in Nature London : Macmillan Publishers Limited, part of Springer Nature, 1869 528(2015), 7582, Seite 384 (DE-627)129292834 (DE-600)120714-3 (DE-576)014473941 0028-0836 nnns volume:528 year:2015 number:7582 pages:384 http://dx.doi.org/10.1038/nature16184 Volltext http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-MAT SSG-OLC-FOR SSG-OLC-SPO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-FOR GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_62 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_100 GBV_ILN_101 GBV_ILN_110 GBV_ILN_120 GBV_ILN_154 GBV_ILN_160 GBV_ILN_168 GBV_ILN_170 GBV_ILN_171 GBV_ILN_211 GBV_ILN_267 GBV_ILN_290 GBV_ILN_294 GBV_ILN_601 GBV_ILN_647 GBV_ILN_754 GBV_ILN_2001 GBV_ILN_2002 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2015 GBV_ILN_2016 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2026 GBV_ILN_2095 GBV_ILN_2116 GBV_ILN_2120 GBV_ILN_2121 GBV_ILN_2173 GBV_ILN_2219 GBV_ILN_2221 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4046 GBV_ILN_4125 GBV_ILN_4219 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4302 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4314 GBV_ILN_4317 GBV_ILN_4320 GBV_ILN_4324 GBV_ILN_4700 AR 528 2015 7582 384
spelling	10.1038/nature16184 doi PQ20160211 (DE-627)OLC1969652438 (DE-599)GBVOLC1969652438 (PRQ)a2089-5309685a8de6bcfa57a65d0c98eb3852cee2c722c1519b9eae2bc05115f433690 (KEY)0072945020150000528758200384hybridquantumlogicandatestofbellsinequalityusingtw DE-627 ger DE-627 rakwb eng 070 500 DNB 500 AVZ BIODIV fid A M Steane verfasserin aut Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing. Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics J P Home oth T P Harty oth D J Szwer oth S C Webster oth D N Stacey oth D M Lucas oth D T C Allcock oth N M Linke oth V M Schäfer oth C J Ballance oth D P L Aude Craik oth Enthalten in Nature London : Macmillan Publishers Limited, part of Springer Nature, 1869 528(2015), 7582, Seite 384 (DE-627)129292834 (DE-600)120714-3 (DE-576)014473941 0028-0836 nnns volume:528 year:2015 number:7582 pages:384 http://dx.doi.org/10.1038/nature16184 Volltext http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-MAT SSG-OLC-FOR SSG-OLC-SPO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-FOR GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_62 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_100 GBV_ILN_101 GBV_ILN_110 GBV_ILN_120 GBV_ILN_154 GBV_ILN_160 GBV_ILN_168 GBV_ILN_170 GBV_ILN_171 GBV_ILN_211 GBV_ILN_267 GBV_ILN_290 GBV_ILN_294 GBV_ILN_601 GBV_ILN_647 GBV_ILN_754 GBV_ILN_2001 GBV_ILN_2002 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2015 GBV_ILN_2016 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2026 GBV_ILN_2095 GBV_ILN_2116 GBV_ILN_2120 GBV_ILN_2121 GBV_ILN_2173 GBV_ILN_2219 GBV_ILN_2221 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4046 GBV_ILN_4125 GBV_ILN_4219 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4302 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4314 GBV_ILN_4317 GBV_ILN_4320 GBV_ILN_4324 GBV_ILN_4700 AR 528 2015 7582 384
allfields_unstemmed	10.1038/nature16184 doi PQ20160211 (DE-627)OLC1969652438 (DE-599)GBVOLC1969652438 (PRQ)a2089-5309685a8de6bcfa57a65d0c98eb3852cee2c722c1519b9eae2bc05115f433690 (KEY)0072945020150000528758200384hybridquantumlogicandatestofbellsinequalityusingtw DE-627 ger DE-627 rakwb eng 070 500 DNB 500 AVZ BIODIV fid A M Steane verfasserin aut Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing. Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics J P Home oth T P Harty oth D J Szwer oth S C Webster oth D N Stacey oth D M Lucas oth D T C Allcock oth N M Linke oth V M Schäfer oth C J Ballance oth D P L Aude Craik oth Enthalten in Nature London : Macmillan Publishers Limited, part of Springer Nature, 1869 528(2015), 7582, Seite 384 (DE-627)129292834 (DE-600)120714-3 (DE-576)014473941 0028-0836 nnns volume:528 year:2015 number:7582 pages:384 http://dx.doi.org/10.1038/nature16184 Volltext http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-MAT SSG-OLC-FOR SSG-OLC-SPO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-FOR GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_62 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_100 GBV_ILN_101 GBV_ILN_110 GBV_ILN_120 GBV_ILN_154 GBV_ILN_160 GBV_ILN_168 GBV_ILN_170 GBV_ILN_171 GBV_ILN_211 GBV_ILN_267 GBV_ILN_290 GBV_ILN_294 GBV_ILN_601 GBV_ILN_647 GBV_ILN_754 GBV_ILN_2001 GBV_ILN_2002 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2015 GBV_ILN_2016 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2026 GBV_ILN_2095 GBV_ILN_2116 GBV_ILN_2120 GBV_ILN_2121 GBV_ILN_2173 GBV_ILN_2219 GBV_ILN_2221 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4046 GBV_ILN_4125 GBV_ILN_4219 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4302 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4314 GBV_ILN_4317 GBV_ILN_4320 GBV_ILN_4324 GBV_ILN_4700 AR 528 2015 7582 384
allfieldsGer	10.1038/nature16184 doi PQ20160211 (DE-627)OLC1969652438 (DE-599)GBVOLC1969652438 (PRQ)a2089-5309685a8de6bcfa57a65d0c98eb3852cee2c722c1519b9eae2bc05115f433690 (KEY)0072945020150000528758200384hybridquantumlogicandatestofbellsinequalityusingtw DE-627 ger DE-627 rakwb eng 070 500 DNB 500 AVZ BIODIV fid A M Steane verfasserin aut Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing. Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics J P Home oth T P Harty oth D J Szwer oth S C Webster oth D N Stacey oth D M Lucas oth D T C Allcock oth N M Linke oth V M Schäfer oth C J Ballance oth D P L Aude Craik oth Enthalten in Nature London : Macmillan Publishers Limited, part of Springer Nature, 1869 528(2015), 7582, Seite 384 (DE-627)129292834 (DE-600)120714-3 (DE-576)014473941 0028-0836 nnns volume:528 year:2015 number:7582 pages:384 http://dx.doi.org/10.1038/nature16184 Volltext http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-MAT SSG-OLC-FOR SSG-OLC-SPO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-FOR GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_62 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_100 GBV_ILN_101 GBV_ILN_110 GBV_ILN_120 GBV_ILN_154 GBV_ILN_160 GBV_ILN_168 GBV_ILN_170 GBV_ILN_171 GBV_ILN_211 GBV_ILN_267 GBV_ILN_290 GBV_ILN_294 GBV_ILN_601 GBV_ILN_647 GBV_ILN_754 GBV_ILN_2001 GBV_ILN_2002 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2015 GBV_ILN_2016 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2026 GBV_ILN_2095 GBV_ILN_2116 GBV_ILN_2120 GBV_ILN_2121 GBV_ILN_2173 GBV_ILN_2219 GBV_ILN_2221 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4046 GBV_ILN_4125 GBV_ILN_4219 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4302 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4314 GBV_ILN_4317 GBV_ILN_4320 GBV_ILN_4324 GBV_ILN_4700 AR 528 2015 7582 384
allfieldsSound	10.1038/nature16184 doi PQ20160211 (DE-627)OLC1969652438 (DE-599)GBVOLC1969652438 (PRQ)a2089-5309685a8de6bcfa57a65d0c98eb3852cee2c722c1519b9eae2bc05115f433690 (KEY)0072945020150000528758200384hybridquantumlogicandatestofbellsinequalityusingtw DE-627 ger DE-627 rakwb eng 070 500 DNB 500 AVZ BIODIV fid A M Steane verfasserin aut Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing. Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics J P Home oth T P Harty oth D J Szwer oth S C Webster oth D N Stacey oth D M Lucas oth D T C Allcock oth N M Linke oth V M Schäfer oth C J Ballance oth D P L Aude Craik oth Enthalten in Nature London : Macmillan Publishers Limited, part of Springer Nature, 1869 528(2015), 7582, Seite 384 (DE-627)129292834 (DE-600)120714-3 (DE-576)014473941 0028-0836 nnns volume:528 year:2015 number:7582 pages:384 http://dx.doi.org/10.1038/nature16184 Volltext http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014 GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-PHY SSG-OLC-CHE SSG-OLC-MAT SSG-OLC-FOR SSG-OLC-SPO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-FOR GBV_ILN_11 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_62 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_100 GBV_ILN_101 GBV_ILN_110 GBV_ILN_120 GBV_ILN_154 GBV_ILN_160 GBV_ILN_168 GBV_ILN_170 GBV_ILN_171 GBV_ILN_211 GBV_ILN_267 GBV_ILN_290 GBV_ILN_294 GBV_ILN_601 GBV_ILN_647 GBV_ILN_754 GBV_ILN_2001 GBV_ILN_2002 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2015 GBV_ILN_2016 GBV_ILN_2018 GBV_ILN_2020 GBV_ILN_2026 GBV_ILN_2095 GBV_ILN_2116 GBV_ILN_2120 GBV_ILN_2121 GBV_ILN_2173 GBV_ILN_2219 GBV_ILN_2221 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4046 GBV_ILN_4125 GBV_ILN_4219 GBV_ILN_4251 GBV_ILN_4277 GBV_ILN_4302 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4313 GBV_ILN_4314 GBV_ILN_4317 GBV_ILN_4320 GBV_ILN_4324 GBV_ILN_4700 AR 528 2015 7582 384
language	English
source	Enthalten in Nature 528(2015), 7582, Seite 384 volume:528 year:2015 number:7582 pages:384
sourceStr	Enthalten in Nature 528(2015), 7582, Seite 384 volume:528 year:2015 number:7582 pages:384
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Experiments Quantum physics Quantum theory Isotopes Cooling Quantum Physics Atomic Physics Physics
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container_title	Nature
authorswithroles_txt_mv	A M Steane @@aut@@ J P Home @@oth@@ T P Harty @@oth@@ D J Szwer @@oth@@ S C Webster @@oth@@ D N Stacey @@oth@@ D M Lucas @@oth@@ D T C Allcock @@oth@@ N M Linke @@oth@@ V M Schäfer @@oth@@ C J Ballance @@oth@@ D P L Aude Craik @@oth@@
publishDateDaySort_date	2015-01-01T00:00:00Z
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author	A M Steane
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title	Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
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title_full	Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
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title_sort	hybrid quantum logic and a test of bell's inequality using two different atomic isotopes
title_auth	Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
abstract	Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing.
abstractGer	Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing.
abstract_unstemmed	Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing (QIP). Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing.
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title_short	Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
url	http://dx.doi.org/10.1038/nature16184 http://www.ncbi.nlm.nih.gov/pubmed/26672554 http://search.proquest.com/docview/1750372223 http://arxiv.org/abs/1505.04014
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Bipartite entangled states of identical particles have been generated and studied in several experiments, and postselected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here we use a deterministic quantum logic gate to generate a 'hybrid' entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the state produced, and make a test of Bell's inequality with non-identical atoms. We use a laser-driven two-qubit gate, whose mechanism is insensitive to the qubits' energy splittings, to produce a maximally entangled state of one ^sup 40^Ca^sup +^ qubit and one ^sup 43^Ca^sup +^ qubit, held 3.5 micrometres apart in the same ion trap, with 99.8 ± 0.6 per cent fidelity. We test the CHSH (Clauser-Horne-Shimony-Holt) version of Bell's inequality for this novel entangled state and find that it is violated by 15 standard deviations; in this test, we close the detection loophole but not the locality loophole. Mixed-species quantum logic is a powerful technique for the construction of a quantum computer based on trapped ions, as it allows protection of memory qubits while other qubits undergo logic operations or are used as photonic interfaces to other processing units. The entangling gate mechanism used here can also be applied to qubits stored in different atomic elements; this would allow both memory and logic gate errors caused by photon scattering to be reduced below the levels required for fault-tolerant quantum error correction, which is an essential prerequisite for general-purpose quantum computing.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Experiments</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Quantum physics</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Quantum theory</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Isotopes</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Cooling</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Quantum Physics</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Atomic Physics</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Physics</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">J P Home</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">T P Harty</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">D J Szwer</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">S C Webster</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">D N Stacey</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">D M Lucas</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">D T C Allcock</subfield><subfield code="4">oth</subfield></datafield><datafield 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Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes

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