Low-frequency quantum sensing

• URL: http://arxiv.org/abs/2209.13870v1
• Date: Wed, 28 Sep 2022 07:06:01 GMT
• Title: Low-frequency quantum sensing
• Authors: E. D. Herbschleb, I. Ohki, K. Morita, Y. Yoshii, H. Kato, T. Makino, S. Yamasaki, N. Mizuochi
• Abstract summary: Ramsey sequences allow precise measurement of direct current fields, while Hahn-echo-like sequences measure alternating current fields. We propose to bridge the gap with a fitting-based algorithm with a frequency-independent sensitivity to coherently measure low-frequency fields.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Exquisite sensitivities are a prominent advantage of quantum sensors. Ramsey sequences allow precise measurement of direct current fields, while Hahn-echo-like sequences measure alternating current fields. However, the latter are restrained for use with high-frequency fields (above approximately $1$ kHz) due to finite coherence times, leaving less-sensitive noncoherent methods for the low-frequency range. In this paper, we propose to bridge the gap with a fitting-based algorithm with a frequency-independent sensitivity to coherently measure low-frequency fields. As the algorithm benefits from coherence-based measurements, its demonstration with a single nitrogen-vacancy center gives a sensitivity of $9.4$ nT Hz$^{-0.5}$ for frequencies below about $0.6$ kHz down to near-constant fields. To inspect the potential in various scenarios, we apply the algorithm at a background field of tens of nTs, and we measure low-frequency signals via synchronization.

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