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International conference on fiber optics and photonics

Towards Multicolor Quantum Correlations in On-chip Frequency Combs

Avik Dutt, Kevin J. Luke, Alexander L. Gaeta, P. Nussenzveig, Michal F. Lipson

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We report strong near-shot-noise-limited correlations of >20 dB between spectrally asymmetric signal and idler modes of a silicon nitride microring based frequency comb, and propose improvements to extend it into the quantum regime.
DOI
10.1364/photonics.2014.t2a.6

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Frequency combs are multimode photonic systems that underlie countless precision sensing and metrology applications. Since their invention over two decades ago, numerous efforts have pushed frequency combs to broader bandwidths and more stable operation. More recently, quantum squeezing and entanglement have been explored in single frequency comb systems for quantum advantages in sensing and signal multiplexing. However, the production of quantum light across multiple frequency combs remains unexplored. In this work, we theoretically explore a mechanism that generates a series of nonlinearly coupled frequency combs through cascaded three-wave upconversion and downconversion processes mediated by a single idler comb. We show how this system generates inter- and intracomb two-mode squeezing and entanglement spanning a very large spectral range, from ultraviolet to mid-IR frequencies. Finally, we show how this system can be engineered to produce on-demand multimode quantum light through covariance matrix optimization. Our findings could enable tunable broadband ghost spectroscopy protocols, squeezing-enhanced pump-probe measurements, and broadband entanglement between spectrally-multiplexed quanta of information.
Our work shows the existence of multipartite quantum correlations in bright frequency combs at the output of a microresonator integrated on silicon nitride platform. Multipartite features go beyond so far reported two-mode correlation and naturally arise due to a cascade of non-linear optical processes that, contrarily to other common experimental configurations, can be initiated by a single-color laser pump. We experimentally illustrate this behaviour by detecting the quantum correlation on the intensity noise spectra of up to 4 bright modes. Presented results, as well as the theoretical and experimental tools dedicated to their measurement, open the way to the exploitation of frequency combs for future quantum technology applications in continuous variable multipartite quantum photonics