CEP Stabilized Dual-Comb Spectroscopy for Quantum Enhanced Sensing

Recent insights suggest that squeezed light frequency combs may be a promising quantum-enhanced sensing platform, however typical 2nd and 3rd order squeezing techniques are naturally sensitive to phase noise [1]. Development of techniques such as feed-forward stabilization systems have allowed us to achieve advanced control of the carrier envelope phase (CEP), yielding record-low levels of timing jitter over long timescales [2, 3]. We demonstrate the benefits of enhanced CEP stabilization in mode-locked lasers for both squeezed and conventional dual-comb spectroscopy (DCS). Through simulations of a stabilized system operating at 1550 nm, we show that reducing jitter improves the resolution of fingerprint peaks near the beat signal. The response is analyzed using both simulated and open-source experimental data in the telecom frequency regime, revealing improved signal-to-noise ratios in both the frequency and time domains. We evaluate the sensitivity and separability via machine learning approaches such as spectral clustering. We discuss the impact that such CEP stabilization and ML integration has on implementing quantum-enhanced spectroscopy using squeezed light DCS.

[1] K. L. Dooley, et. al. Opt. Express 23, 8235-8245 (2015)

[2] R. Lemons, et. al. Opt. Lett. 44, 5610-5613 (2019)

[3] J. Hirschman, et al. Opt. Express 28.23, 34093-34103 (2020)