Room-temperature entanglement between single defect spins in diamond
Room-temperature entanglement between single defect spins in diamond
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DOI：
10.1038/nphys2545
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发表时间：
2013-03-01
期刊：
影响因子：
19.6
通讯作者：
Wrachtrup, J.
中科院分区：
文献类型：
--
作者：
Dolde, F.;Jakobi, I.;Wrachtrup, J.
纠缠是量子物理学的核心但短暂的现象。它曾经被认为是量子理论中一种独特的反直觉性质（1），但现已发展成为量子技术的最核心要素。因此，已经有许多实验证明了光子（，）（2）原子（3），离子（4）和固态系统（如自旋或量子点（5-7），超导电路（8，9）和宏观金刚石（10））之间的纠缠。在这里，我们实验证明了两个工程单固态自旋量子比特（量子比特）在环境条件下的纠缠。缺陷对的光子发射揭示了基态自旋相关。纠缠（保真度= 0.67 +/- 0.04）被证明是由量子态层析成像。此外，通过纠缠交换到核自旋，电子自旋纠缠的寿命延长到毫秒。这些实验标志着朝着可扩展的室温量子器件迈出了重要的一步，该器件在量子信息处理和计量学中具有潜在的用途。
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.