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arXiv 1504.06385quant-phcond-mat.mes-hallcond-mat.stat-mech
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具有金刚石中氮空位中心电子和核自旋的快速高保真量子门的最优控制

Optimal control of fast and high-fidelity quantum gates with electron and nuclear spins of a nitrogen-vacancy center in diamond

Yi Chou, Shang-Yu Huang, Hsi-Sheng Goan

摘要:

金刚石中带负电荷的氮空位(NV)中心被认为是一种良好的固态量子比特。由NV中心的电子自旋和超精细耦合的氮以及另外附近的碳核自旋组成的系统可以形成用于量子信息处理或作为量子中继器中的节点的若干量子位的量子寄存器。已经报道了几个关于混合电子和核自旋寄存器的令人印象深刻的实验,但到目前为止所实现的量子效率还没有达到或低于容错量子计算(FTQC)所需的阈值。利用基于Krotov方法的量子最优控制理论,在考虑泄漏态、邻近噪声量子比特和远处自旋影响的情况下,我们可以在FTQC的通用量子门集合中实现快速、高保真的单量子比特和双量子比特门,其误差小于FTQC阈值定理所要求的误差.

英文摘要:

A negatively charged nitrogen vacancy (NV) center in diamond has been recognized as a good solid-state qubit. A system consisting of the electronic spin of the NV center and hyperfine-coupled nitrogen and additionally nearby carbon nuclear spins can form a quantum register of several qubits for quantum information processing or as a node in a quantum repeater. Several impressive experiments on the hybrid electron and nuclear spin register have been reported, but fidelities achieved so far are not yet at or below the thresholds required for fault-tolerant quantum computation (FTQC). Using quantum optimal control theory based on the Krotov method, we show here that fast and high-fidelity single-qubit and two-qubit gates in the universal quantum gate set for FTQC, taking into account the effects of the leakage state, nearby noise qubits and distant bath spins, can be achieved with errors less than those required by the threshold theorem of FTQC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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