硅空位自旋的计算增强型高维量子门

Gang Fan, Fang-Fang Du
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引用次数: 0

摘要

基于高维希尔伯特空间的量子门可以为有效加快量子计算速度和执行复杂的量子逻辑运算提供可行的途径。在本文中,我们提出了一种针对四硅空位自旋的 2 位 4 次元受控不(CNOT)量子门,其中硅空位中心的前两个电子自旋态被编码为控制量子位,而其他量子位则被编码为目标量子位。所提议的协议是在辅助光子的帮助下实现的,辅助光子是连接四个独立单面光纳腔中四个无运动硅空位自旋的公共数据总线。此外,CNOT 栅极通过执行与单光子探测器的不同结果相对应的关系前馈操作,以确定性的方式针对辅助光子工作。此外,它还可以推广到其他固态量子系统。在现有技术条件下,2-双位 CNOT 门的效率和保真度都很高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Computation-Enhanced High-Dimensional Quantum Gate for Silicon-Vacancy Spins
Qudit-based quantum gates in high-dimensional Hilbert space can provide a viable route towards effectively accelerating the speed of quantum computing and performing complex quantum logic operations. In the paper, we propose a 2-qudit $4\times4$-dimensional controlled-not (CNOT) gate for four silicon-vacancy spins, in which the first two electron-spin states in silicon-vacancy centers are encoded as the control qudits, and the other ones as the target qudits. The proposed protocol is implemented with assistance of an ancillary photon that serves as a common-data bus linking four motionless silicon-vacancy spins placed in four independent single-sided optical nanocavities. Moreover, the CNOT gate works in a deterministic manner by performing the relational feed-forward operations corresponding to the diverse outcomes of the single-photon detectors to be directed against the ancillary photon. Further, it can be potentially generalized to other solid-state quantum system. Under current technological conditions, both the efficiency and fidelity of the 2-qudit CNOT gate are high.
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