DOE OSTI · 3364736
Phase-Dependent Squeezing in Dual-Comb Interferometry
Abstract
Manipulating the quantum noise of continuous-wave lasers through squeezing has reshaped optical interferometry. However, progress in optical frequency comb interferometry with pulsed squeezed sources has been limited, despite the role of frequency combs in ultraprecise optical metrology. Here, we introduce a new time-domain approach to characterizing squeezed femtosecond light pulses using dual-comb interferometry. Time-domain interferograms are generated via multiheterodyne beating between the modes of a Kerr soliton-squeezed frequency comb and a coherent state comb. The interferogram noise reveals phase-dependent squeezing and antisqueezing, dipping as much as 3.8 ± 0.2 dB below the shot noise level at alternating zero crossings. We model this nonstationary quantum noise as a periodic optical displacement of the squeezed comb by the coherent comb. These results support a route toward quantum-enhanced dual-comb timing applications and high-speed quantum state tomography with dual-comb interferometers.
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Herman, Daniel Issac [University of Colorado, Boulder, CO (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)], Kreider, Molly Kate [University of Colorado, Boulder, CO (United States)], Lordi, Noah [University of Colorado, Boulder, CO (United States)] (ORCID:0009000569702240), Walsh, Mathieu [Université Laval, Quebec City, QC (Canada)] (ORCID:0000000303601664), Tsao, Eugene J. [University of Colorado, Boulder, CO (United States)], Lind, Alexander J. [University of Colorado, Boulder, CO (United States)] (ORCID:0009000503651938), Heyrich, Matthew [University of Colorado, Boulder, CO (United States)], Combes, Joshua [University of Colorado, Boulder, CO (United States)] (ORCID:0000000331995744), Diddams, Scott A. [University of Colorado, Boulder, CO (United States)] (ORCID:0000000221440764), Genest, Jérôme [Université Laval, Quebec City, QC (Canada)] (ORCID:0000000299850480). 2026-04-20. Phase-Dependent Squeezing in Dual-Comb Interferometry. https://doi.org/10.1103/31w7-69c8
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