Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908352097812480 |
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| author | Shen, Yichen Hsieh, Ping-Yen Srinivasan, Dhruv Henry, Antoine Moille, Gregory Sridhar, Sashank Kaushik Restelli, Alessandro Chang, You-Chia Srinivasan, Kartik Smith, Thomas A. Dutt, Avik |
| author_facet | Shen, Yichen Hsieh, Ping-Yen Srinivasan, Dhruv Henry, Antoine Moille, Gregory Sridhar, Sashank Kaushik Restelli, Alessandro Chang, You-Chia Srinivasan, Kartik Smith, Thomas A. Dutt, Avik |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03734 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability Shen, Yichen Hsieh, Ping-Yen Srinivasan, Dhruv Henry, Antoine Moille, Gregory Sridhar, Sashank Kaushik Restelli, Alessandro Chang, You-Chia Srinivasan, Kartik Smith, Thomas A. Dutt, Avik Optics Quantum Physics 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. |
| title | Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2505.03734 |