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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