Quantum noise in a squeezed-light-enhanced multiparameter quantum sensor

• URL: http://arxiv.org/abs/2506.08190v1
• Date: Mon, 09 Jun 2025 20:00:51 GMT
• Title: Quantum noise in a squeezed-light-enhanced multiparameter quantum sensor
• Authors: Aleksandra Sierant, Diana Méndez-Avalos, Santiago Tabares Giraldo, Morgan W. Mitchell,
• Abstract summary: We study quantum enhancement of sensitivity using squeezed light in a quantum sensor.<n>The hOPM acquires both the dc field strength (scalar magnetometry) and resonantly detects one quadrature of the ac magnetic field at a chosen frequency.<n>We observe these interactions using squeezed light as a tool to control the distribution of quantum noise between $S$ and $S_3$ Stokes components.
• Score: 41.94295877935867
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study quantum enhancement of sensitivity using squeezed light in a multi-parameter quantum sensor, the hybrid rf-dc optically pumped magnetometer (hOPM) [Phys. Rev. Applied 21, 034054, (2024)]. Using a single spin ensemble, the hOPM acquires both the dc field strength (scalar magnetometry), and resonantly detects one quadrature of the ac magnetic field at a chosen frequency (rf magnetometry). In contrast to the Bell-Bloom scalar magnetometer (BBOPM) [Phys. Rev. Lett. 127, 193601 (2021)], the back-action evasion in the hOPM is incomplete, leading to a complex interplay of the three quantum noise sources in this system: photon shot noise, spin projection noise, and measurement back-action noise. We observe these interactions using squeezed light as a tool to control the distribution of optical quantum noise between $S_2$ and $S_3$ polarization Stokes components, and the resulting effect on readout quantum noise and measurement back-action.

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