Room-temperature entanglement between single defect spins in diamond

被引：363
作者：
Dolde, F. [1 ,2 ]
Jakobi, I. [1 ,2 ,3 ,4 ]
Naydenov, B. [1 ,2 ]
Zhao, N. [1 ,2 ]
Pezzagna, S. [5 ]
Trautmann, C. [6 ,7 ]
Meijer, J. [5 ]
Neumann, P. [1 ,2 ]
Jelezko, F. [1 ,2 ,3 ,4 ]
Wrachtrup, J. [1 ,2 ]
机构：
[1] Univ Stuttgart, Phys Inst 3, Res Ctr SCoPE, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, IQST, D-70569 Stuttgart, Germany
[3] Univ Ulm, Inst Quantenopt, D-89081 Ulm, Germany
[4] Univ Ulm, IQST, D-89081 Ulm, Germany
[5] Ruhr Univ Bochum, RUBION, D-44780 Bochum, Germany
[6] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany
[7] Tech Univ Darmstadt, D-64289 Darmstadt, Germany
来源：
NATURE PHYSICS | 2013年 / 9卷 / 03期
关键词：
MAGNETIC-RESONANCE; COUPLED ELECTRON; COLOR-CENTERS; QUANTUM; REALIZATION; MICROSCOPY; STATES;
D O I：
10.1038/nphys2545
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Entanglement is the central yet fleeting phenomenon of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory(1), it has developed into the most central element of quantum technology. Consequently, there have been a number of experimental demonstrations of entanglement between photons(,)(2) atoms(3), ions(4) and solid-state systems such as spins or quantum dots(5-7), superconducting circuits(8,9) and macroscopic diamond(10). 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.
引用
收藏
页码：139 / 143
页数：5
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