Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability

• URL: http://arxiv.org/abs/2505.03734v1
• Date: Tue, 06 May 2025 17:59:23 GMT
• Title: Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability
• Authors: Yichen Shen, Ping-Yen Hsieh, Dhruv Srinivasan, Antoine Henry, Gregory Moille, Sashank Kaushik Sridhar, Alessandro Restelli, You-Chia Chang, Kartik Srinivasan, Thomas A. Smith, Avik Dutt,
• Abstract summary: We present a nanophotonic squeezer that produces directly detected squeezing of 5.6 dB $pm$ 0.2 dB.<n>We introduce a seed-assisted detection technique into such nanophotonic squeezers that reveals a quantum frequency comb (QFC) of 16 qumodes.<n>Our results significantly advance both the generation and detection of nanophotonic squeezed light in a broadband and multimode platform.
• Score: 32.121475563036455
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Squeezed light offers genuine quantum advantage in enhanced sensing and quantum computation; yet the level of squeezing or quantum noise reduction generated from nanophotonic chips has been limited. In addition to strong quantum noise reduction, key desiderata for such a nanophotonic squeezer include frequency agility or tunability over a broad frequency range, and simultaneous operation in many distinct, well-defined quantum modes (qumodes). Here we present a strongly overcoupled silicon nitride squeezer based on a below-threshold optical parametric amplifier (OPA) that produces directly detected squeezing of 5.6 dB $\pm$ 0.2 dB, surpassing previous demonstrations in both continuous-wave and pulsed regimes. We introduce a seed-assisted detection technique into such nanophotonic squeezers that reveals a quantum frequency comb (QFC) of 16 qumodes, with a separation of 11~THz between the furthest qumode pair, while maintaining a strong squeezing. Additionally, we report spectral tuning of a qumode comb pair over one free-spectral range of the OPA, thus bridging the spacing between the discrete modes of the QFC. Our results significantly advance both the generation and detection of nanophotonic squeezed light in a broadband and multimode platform, establishing a scalable, chip-integrated path for compact quantum sensors and continuous-variable quantum information processing systems.

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