Room-temperature entanglement between single defect spins in diamond

被引：372

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

页码：139 / 143

页数：5

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