Robust coherent control of solid-state spin qubits using anti-Stokes excitation

Jun-Feng Wang, Fei-Fei Yan, Qiang Li, Zheng-Hao Liu, Jin-Ming Cui, Zhao-Di Liu, Adam Gali (), Jin-Shi Xu (), Chuan-Feng Li () and Guang-Can Guo
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Jun-Feng Wang: University of Science and Technology of China
Fei-Fei Yan: University of Science and Technology of China
Qiang Li: University of Science and Technology of China
Zheng-Hao Liu: University of Science and Technology of China
Jin-Ming Cui: University of Science and Technology of China
Zhao-Di Liu: University of Science and Technology of China
Adam Gali: Budapest University of Technology and Economics
Jin-Shi Xu: University of Science and Technology of China
Chuan-Feng Li: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Optically addressable solid-state color center spin qubits have become important platforms for quantum information processing, quantum networks and quantum sensing. The readout of color center spin states with optically detected magnetic resonance (ODMR) technology is traditionally based on Stokes excitation, where the energy of the exciting laser is higher than that of the emission photons. Here, we investigate an unconventional approach using anti-Stokes excitation to detect the ODMR signal of silicon vacancy defect spin in silicon carbide, where the exciting laser has lower energy than the emitted photons. Laser power, microwave power and temperature dependence of the anti-Stokes excited ODMR are systematically studied, in which the behavior of ODMR contrast and linewidth is shown to be similar to that of Stokes excitation. However, the ODMR contrast is several times that of the Stokes excitation. Coherent control of silicon vacancy spin under anti-Stokes excitation is then realized at room temperature. The spin coherence properties are the same as those of Stokes excitation, but with a signal contrast that is around three times greater. To illustrate the enhanced spin readout contrast under anti-Stokes excitation, we also provide a theoretical model. The experiments demonstrate that the current anti-Stokes excitation ODMR approach has promising applications in quantum information processing and quantum sensing.

Date: 2021
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DOI: 10.1038/s41467-021-23471-8

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