Coherent spin control of a nanocavity-enhanced qubit in diamond
Coherent spin control of a nanocavity-enhanced qubit in diamond
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DOI：
10.1038/ncomms7173
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发表时间：
2015-01-01
影响因子：
16.6
通讯作者：
Englund, Dirk
中科院分区：
文献类型：
--
作者：
Li, Luozhou;Schroeder, Tim;Englund, Dirk
量子信息处理的一个中心目标是通过光子有效地纠缠多个静止量子存储器。在固态系统中，金刚石中的氮空位中心已成为具有二级电子自旋相干时间的优秀光学寻址存储器。最近，两个氮空位存储器之间的量子纠缠和隐形传态已经被证明，但扩展到更大的网络需要更有效的自旋光子接口，如光学谐振器。在这里，我们报道了在强珀塞尔区，使用硅硬掩膜制造工艺，光学质量因子接近10,000，电子自旋相干时间超过200 μ s的氮空位纳米腔系统。该自旋光子接口与片上微波带状线集成，用于相干自旋控制，为量子网络提供了高效的量子存储器。
A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators. Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 mu s using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks.