Quantum sensing with duplex qubits of silicon vacancy centers in SiC at room temperature

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Kosuke Tahara, Shin-ichi Tamura, Haruko Toyama, Jotaro J. Nakane, Katsuhiro Kutsuki, Yuichi Yamazaki, Takeshi Ohshima
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Abstract

The silicon vacancy center in Silicon Carbide (SiC) provides an optically addressable qubit at room temperature in its spin-\(\frac{3}{2}\) electronic state. However, optical spin initialization and readout are less efficient compared to those of spin-1 systems, such as nitrogen-vacancy centers in diamond, under non-resonant optical excitation. Spin-dependent fluorescence exhibits contrast only between \(| m=\pm 3/2\left.\right\rangle\) and \(| m=\pm 1/2\left.\right\rangle\) states, and optical pumping does not create a population difference between \(| +1/2\left.\right\rangle\) and \(| -1/2\left.\right\rangle\) states. Thus, operating one qubit (e.g., \(\left\{| +3/2\left.\right\rangle ,| +1/2\left.\right\rangle \right\}\) states) leaves the population in the remaining state (\(| -1/2\left.\right\rangle\)) unaffected, contributing to background in optical readout. To mitigate this problem, we propose a sensing scheme based on duplex qubit operation in the quartet, using microwave pulses with two resonant frequencies to simultaneously operate \(\left\{| +3/2\left.\right\rangle ,| +1/2\left.\right\rangle \right\}\) and \(\left\{| -1/2\left.\right\rangle ,| -3/2\left.\right\rangle \right\}\). Experimental results demonstrate that this approach doubles signal contrast in optical readout and improves sensitivity in AC magnetometry compared to simplex operation.

Abstract Image

室温下SiC中硅空位中心双量子位的量子传感
碳化硅(SiC)中的硅空位中心在室温下提供了一个自旋\(\frac{3}{2}\)电子态的光学寻址量子比特。然而,在非共振光激发下,与自旋为1的系统(如金刚石中的氮空位中心)相比,光自旋初始化和读出效率较低。自旋依赖荧光仅在\(| m=\pm 3/2\left.\right\rangle\)和\(| m=\pm 1/2\left.\right\rangle\)状态之间表现出对比,光泵浦不会在\(| +1/2\left.\right\rangle\)和\(| -1/2\left.\right\rangle\)状态之间产生种群差异。因此,操作一个量子位(例如\(\left\{| +3/2\left.\right\rangle ,| +1/2\left.\right\rangle \right\}\)状态)会使剩余状态(\(| -1/2\left.\right\rangle\))的种群不受影响,从而影响光学读出的背景。为了解决这个问题,我们提出了一种基于双量子比特操作的传感方案,使用两个共振频率的微波脉冲同时操作\(\left\{| +3/2\left.\right\rangle ,| +1/2\left.\right\rangle \right\}\)和\(\left\{| -1/2\left.\right\rangle ,| -3/2\left.\right\rangle \right\}\)。实验结果表明,该方法提高了光读出的信号对比度,提高了交流磁强计的灵敏度。
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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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