Bourassa Alexandre, Anderson Christopher P, Miao Kevin C, Onizhuk Mykyta, Ma He, Crook Alexander L, Abe Hiroshi, Ul-Hassan Jawad, Ohshima Takeshi, Son Nguyen T, Galli Giulia, Awschalom David D
Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA.
Department of Physics, University of Chicago, Chicago, IL, USA.
Nat Mater. 2020 Dec;19(12):1319-1325. doi: 10.1038/s41563-020-00802-6. Epub 2020 Sep 21.
Nuclear spins in the solid state are both a cause of decoherence and a valuable resource for spin qubits. In this work, we demonstrate control of isolated Si nuclear spins in silicon carbide (SiC) to create an entangled state between an optically active divacancy spin and a strongly coupled nuclear register. We then show how isotopic engineering of SiC unlocks control of single weakly coupled nuclear spins and present an ab initio method to predict the optimal isotopic fraction that maximizes the number of usable nuclear memories. We bolster these results by reporting high-fidelity electron spin control (F = 99.984(1)%), alongside extended coherence times (Hahn-echo T = 2.3 ms, dynamical decoupling T > 14.5 ms), and a >40-fold increase in Ramsey spin dephasing time (T*) from isotopic purification. Overall, this work underlines the importance of controlling the nuclear environment in solid-state systems and links single photon emitters with nuclear registers in an industrially scalable material.
固态中的核自旋既是退相干的原因，也是自旋量子比特的宝贵资源。在这项工作中，我们展示了对碳化硅（SiC）中孤立硅核自旋的控制，以在光学活性双空位自旋和强耦合核寄存器之间创建纠缠态。然后，我们展示了SiC的同位素工程如何实现对单个弱耦合核自旋的控制，并提出了一种从头算方法来预测使可用核存储器数量最大化的最佳同位素分数。我们通过报告高保真电子自旋控制（F = 99.984(1)%）、延长的相干时间（哈恩回波T = 2.3 ms，动态解耦T > 14.5 ms）以及同位素纯化使拉姆齐自旋退相时间（T*）增加40倍以上来支持这些结果。总体而言，这项工作强调了在固态系统中控制核环境的重要性，并将单光子发射器与工业可扩展材料中的核寄存器联系起来。
