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All-optical control of a solid-state spin using coherent dark states

renchunxiao 添加于 2013/5/3 10:25:21  962次阅读 | 0次推荐 | 0个评论

The study of individual quantum systems in solids, for use as quantum bits (qubits) and probes of decoherence, requires protocols for their initialization, unitary manipulation, and readout. In many solid-state quantum systems, these operations rely on disparate techniques that can vary widely depending on the particular qubit structure. One such qubit, the nitrogen-vacancy (NV) center spin in diamond, can be initialized and read out through its special spin-selective intersystem crossing, while microwave electron spin resonance techniques provide unitary spin rotations. Instead, we demonstrate an alternative, fully optical approach to these control protocols in an NV center that does not rely on its intersystem crossing. By tuning an NV center to an excited-state spin anticrossing at cryogenic temperatures, we use coherent population trapping and stimulated Raman techniques to realize initialization, readout, and unitary manipulation of a single spin. Each of these techniques can be performed directly along any arbitrarily chosen quantum basis, removing the need for extra control steps to map the spin to and from a preferred basis. Combining these protocols, we perform measurements of the NV center’s spin coherence, a demonstration of this full optical control. Consisting solely of optical pulses, these techniques enable control within a smaller footprint and within photonic networks. Likewise, this unified approach obviates the need for both electron spin resonance manipulation and spin addressability through the intersystem crossing. This method could therefore be applied to a wide range of potential solid-state qubits, including those which currently lack a means to be addressed.

作 者:Christopher G. Yalea,1,2, Bob B. Buckleya,1, David J. Christlea,2, Guido Burkardb, F. Joseph Heremansa,2, Lee C. Bassetta, and David D. Awschaloma,c,3
期刊名称: Proceedings of the National Academy of Sciences
期卷页: 第卷 第期 ~页
学科领域:信息科学 » 半导体科学与信息器件 » 半导体晶体与薄膜材料
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原文链接:http://www.pnas.org/content/early/2013/04/18/1305920110.abstract?sid=89a068cb-eb1c-48dd-931b-9a9b4de2bc56
DOI: 10.1073/pnas.1305920110
ISBN: 0027-8424
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相关报道: http://paper.sciencenet.cn/htmlpaper/20135310316328964.shtm
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