Presentation Information

9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[9a-E311-2]All-optical quantum sensing using quantum-defect spins: experiments

〇Kazuya Harii¹, Shunsuke Daimon¹, Hidenori Hiraishi², Yasuto Hijikata², Yuichiro Matsushita^3,4,1, Takeshi Ohshima^1,5, Makoto Kohda^5,6 (1.QST, 2.Saitama Univ., 3.Univ. of Tokyo, 4.Quemix, 5.Tohoku Univ., 6.Univ. of Washington)

Keywords:

quantum sensing,silicon vacancy,silicon carbide

We developed a microwave-free magnetic field sensor using silicon vacancies in 4H-SiC, based on spin-state mixing induced by a transverse magnetic field. Using a fluorescence detection system with a 785 nm excitation laser and optical-fiber transmission, we confirmed monotonic changes in fluorescence intensity in weak magnetic fields up to 1.5 mT. This method enables magnetic field estimation solely through fluorescence measurements and is expected to be applicable to compact, low-maintenance sensors that require no electrical power at the sensor head. The presentation will also discuss the dependences on magnetic field angle and excitation light intensity.

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