Coherent properties of single rare-earth spin qubits
Coherent properties of single rare-earth spin qubits
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DOI：
10.1038/ncomms4895
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发表时间：
2014-05-01
影响因子：
16.6
通讯作者：
Wrachtrup, J.
中科院分区：
文献类型：
--
作者：
Siyushev, P.;Xia, K.;Wrachtrup, J.
稀土掺杂晶体是光子量子存储的极好硬件。这些材料的额外功能是通过其允许片上光子网络的波导特性来增加的。然而，稀土单自旋量子比特的检测和相干特性迄今尚未得到证实。本文介绍了钇铝石榴石晶体中Ce ~（3+）离子单电子自旋的高保真光学初始化、有效相干操纵和光学读出的实验结果。在动态解耦下，自旋相干寿命达到T-2 = 2 ms，几乎是有限的测量自旋晶格弛豫时间T-1 = 4.5 ms。强超精细耦合铝核自旋表明，铈电子自旋可以利用光子和长寿命的核自旋记忆之间的接口。结合Ce 3+发射的高亮度和从主体材料中创建光子电路的可能性，这使得铈自旋成为集成量子光子学的有趣选择。
Rare-earth-doped crystals are excellent hardware for quantum storage of photons. Additional functionality of these materials is added by their waveguiding properties allowing for on-chip photonic networks. However, detection and coherent properties of rare-earth single-spin qubits have not been demonstrated so far. Here we present experimental results on high-fidelity optical initialization, effcient coherent manipulation and optical readout of a single-electron spin of Ce3+ ion in a yttrium aluminium garnet crystal. Under dynamic decoupling, spin coherence lifetime reaches T-2 = 2ms and is almost limited by the measured spin-lattice relaxation time T-1 = 4.5 ms. Strong hyperfine coupling to aluminium nuclear spins suggests that cerium electron spins can be exploited as an interface between photons and long-lived nuclear spin memory. Combined with high brightness of Ce3+ emission and a possibility of creating photonic circuits out of the host material, this makes cerium spins an interesting option for integrated quantum photonics.