Soliton microcombs—phase-locked microcavity frequency combs—have become the foundation of several classical technologies in integrated photonics, including spectroscopy, LiDAR and optical computing. Despite the predicted multimode entanglement across the comb, experimental study of the quantum optics of the soliton microcomb has been elusive. In this work we use second-order photon correlations to study the underlying quantum processes of soliton microcombs in an integrated silicon carbide microresonator. We show that a stable temporal lattice of solitons can isolate a multimode below-threshold Gaussian state from any admixture of coherent light, and predict that all-to-all entanglement can be realized for the state. Our work opens a pathway toward a soliton-based multimode quantum resource.
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Communications Physics Open Access 08 October 2022
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We gratefully acknowledge discussions with J. Bowers, T. Zhong, L. Chang, C. Bao, B. Shen, A. Dutt and S. Sun. This work is funded by the Defense Advanced Research Projects Agency under the PIPES and LUMOS programmes and by the IET AF Harvey Prize. M.A.G. acknowledges the Albion Hewlett Stanford Graduate Fellowship (SGF) and the NSF Graduate Research Fellowship. D.M.L. acknowledges the Fong SGF and the National Defense Science and Engineering Graduate Fellowship. Part of this work was performed at the Stanford Nanofabrication Facility (SNF) and the Stanford Nano Shared Facilities (SNSF).
The authors declare no competing interests.
Peer review information Nature Photonics thanks the anonymous reviewers for their contribution to the peer review of this work.
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Guidry, M.A., Lukin, D.M., Yang, K.Y. et al. Quantum optics of soliton microcombs. Nat. Photon. 16, 52–58 (2022). https://doi.org/10.1038/s41566-021-00901-z
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