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Room-temperature entanglement between single defect spins in diamond

Dolde, F. and Jakobi, I. and Naydenov, B. and Zhao, N. and Pezzagna, S. and Trautmann, C. and Meijer, J. and Neumann, P. and Jelezko, F. and Wrachtrup, J. (2013):
Room-temperature entanglement between single defect spins in diamond.
In: Nature Physics, Macmillan Publishers Limited, pp. 139-143, 9, (3), ISSN 1745-2473, [Online-Edition: http://dx.doi.org/10.1038/nphys2545],
[Article]

Abstract

Entanglement is the central yet fleeting phenomenon of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory1, it has developed into the most central element of quantum technology. Consequently, there have been a number of experimental demonstrations of entanglement between photons2, atoms3, ions4 and solid-state systems such as spins or quantum dots5, 6, 7, superconducting circuits8, 9 and macroscopic diamond10. Here we experimentally demonstrate entanglement between two engineered single solid-state spin quantum bits (qubits) at ambient conditions. Photon emission of defect pairs reveals ground-state spin correlation. Entanglement (fidelity = 0.67±0.04) is proved by quantum state tomography. Moreover, the lifetime of electron spin entanglement is extended to milliseconds by entanglement swapping to nuclear spins. The experiments mark an important step towards a scalable room-temperature quantum device being of potential use in quantum information processing as well as metrology.

Item Type: Article
Erschienen: 2013
Creators: Dolde, F. and Jakobi, I. and Naydenov, B. and Zhao, N. and Pezzagna, S. and Trautmann, C. and Meijer, J. and Neumann, P. and Jelezko, F. and Wrachtrup, J.
Title: Room-temperature entanglement between single defect spins in diamond
Language: English
Abstract:

Entanglement is the central yet fleeting phenomenon of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory1, it has developed into the most central element of quantum technology. Consequently, there have been a number of experimental demonstrations of entanglement between photons2, atoms3, ions4 and solid-state systems such as spins or quantum dots5, 6, 7, superconducting circuits8, 9 and macroscopic diamond10. Here we experimentally demonstrate entanglement between two engineered single solid-state spin quantum bits (qubits) at ambient conditions. Photon emission of defect pairs reveals ground-state spin correlation. Entanglement (fidelity = 0.67±0.04) is proved by quantum state tomography. Moreover, the lifetime of electron spin entanglement is extended to milliseconds by entanglement swapping to nuclear spins. The experiments mark an important step towards a scalable room-temperature quantum device being of potential use in quantum information processing as well as metrology.

Journal or Publication Title: Nature Physics
Volume: 9
Number: 3
Publisher: Macmillan Publishers Limited
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Apr 2014 09:13
Official URL: http://dx.doi.org/10.1038/nphys2545
Identification Number: doi:10.1038/nphys2545
Funders: The authors would like to acknowledge financial support by the EU through SQUTEC and Diamant, as well as the DFG through SFB/TR21, the research groups 1493 ‘Diamond quantum materials’ and 1482 as well as the Volkswagen Foundation.
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