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

• URL: http://arxiv.org/abs/2411.10208v1
• Date: Fri, 15 Nov 2024 14:13:04 GMT
• Title: Quantum sensing with duplex qubits of silicon vacancy centers in SiC at room temperature
• Authors: Kosuke Tahara, Shin-ichi Tamura, Haruko Toyama, Jotaro J. Nakane, Katsuhiro Kutsuki, Yuichi Yamazaki, Takeshi Ohshima,
• Abstract summary: The silicon vacancy center in Silicon Carbide (SiC) provides an optically addressable qubit at room temperature in its spin-$frac32$ electronic state. We propose a sensing scheme based on duplex qubit operation in the quartet, using microwave pulses with two resonant frequencies to simultaneously operate $left |+3/2rangle, |+1/2rangle right$ and $left |-1/2rangle, |-3/2rangle right$.
• Score: 1.8218298349840023
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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 $|m=\pm 3/2\rangle$ and $|m=\pm 1/2\rangle$ states, and optical pumping does not create a population difference between $|+1/2\rangle$ and $|-1/2\rangle$ states. Thus, operating one qubit (e.g., $\left\{|+3/2\rangle, |+1/2\rangle \right\}$ states) leaves the population in the remaining state ($|-1/2\rangle$) 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 $\left\{ |+3/2\rangle, |+1/2\rangle \right\}$ and $\left\{ |-1/2\rangle, |-3/2\rangle \right\}$. Experimental results demonstrate that this approach doubles signal contrast in optical readout and improves sensitivity in AC magnetometry compared to simplex operation.

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