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4 October 2023 Quantum enhanced probes of magnetic circular dichroism
Benjamin J. Lawrie, Chengyun Hua, Seongjin Hong, Matthew Feldman, Claire Marvinney, Raphael Pooser, Alberto Marino
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Proceedings Volume PC12692, Quantum Communications and Quantum Imaging XXI; PC126920A (2023) https://doi.org/10.1117/12.2677669
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Magneto-optical spectroscopies are increasingly powerful probes of spin excitations in quantum materials, but at cryogenic temperatures, the laser excitation can be highly non-perturbative. While balanced photodetection can be used to suppress classical noise sources, the photon shot noise limit fundamentally constrains the measurement sensitivity for a given laser power. Here, we have used a two-mode squeezed light source to suppress noise below the shot noise level for magnetic circular dichroism measurements, thus enabling lower power measurements with reduced photothermal effects. We also describe the fundamental sensitivity limits for quantum enhanced interferometric and intensity-difference magneto-optical Kerr effect and circular dichroism spectroscopies.
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Benjamin J. Lawrie, Chengyun Hua, Seongjin Hong, Matthew Feldman, Claire Marvinney, Raphael Pooser, and Alberto Marino "Quantum enhanced probes of magnetic circular dichroism", Proc. SPIE PC12692, Quantum Communications and Quantum Imaging XXI, PC126920A (4 October 2023); https://doi.org/10.1117/12.2677669
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KEYWORDS
Circular dichroism spectroscopy
Magnetism
Quantum enhancement
Quantum probes
Quantum signals
Quantum shot noise
Signal processing
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