Photon number distribution of squeezed light from a silicon nitride microresonator measured without photon number resolving detectors
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915281050271744 |
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| author | Brusaschi, Emanuele Borghi, Massimo Bacchi, Marcello Liscidini, Marco Galli, Matteo Bajoni, Daniele |
| author_facet | Brusaschi, Emanuele Borghi, Massimo Bacchi, Marcello Liscidini, Marco Galli, Matteo Bajoni, Daniele |
| contents | The measurement of the photon number distribution (PND) allows one to extract metrics of non-classicality of fundamental and technological relevance, but in principle it requires the use of detectors with photon number resolving (PNR) capabilities.In this work we reconstruct the PND of two-mode pulsed squeezed light generated from a silicon nitride microresonator using threshold detectors and variable optical attenuations. The PNDs are characterized up to 1.2 photons/pulse, through which we extracted an on-chip squeezing level of 6.2(2) dB and a noise reduction factor of -3.8(2) dB. The PNDs are successfully reconstructed up to an Hilbert space dimension of 6x6. The analysis performed on the photon-number basis allows us to characterize the influence of a spurious thermal background field that spoils the photon number correlations. We evaluate the impact of self and cross phase modulation on the generation efficiency in case of a pulsed pump, and validate the results through numerical simulations of the master equation of the system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13406 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photon number distribution of squeezed light from a silicon nitride microresonator measured without photon number resolving detectors Brusaschi, Emanuele Borghi, Massimo Bacchi, Marcello Liscidini, Marco Galli, Matteo Bajoni, Daniele Quantum Physics The measurement of the photon number distribution (PND) allows one to extract metrics of non-classicality of fundamental and technological relevance, but in principle it requires the use of detectors with photon number resolving (PNR) capabilities.In this work we reconstruct the PND of two-mode pulsed squeezed light generated from a silicon nitride microresonator using threshold detectors and variable optical attenuations. The PNDs are characterized up to 1.2 photons/pulse, through which we extracted an on-chip squeezing level of 6.2(2) dB and a noise reduction factor of -3.8(2) dB. The PNDs are successfully reconstructed up to an Hilbert space dimension of 6x6. The analysis performed on the photon-number basis allows us to characterize the influence of a spurious thermal background field that spoils the photon number correlations. We evaluate the impact of self and cross phase modulation on the generation efficiency in case of a pulsed pump, and validate the results through numerical simulations of the master equation of the system. |
| title | Photon number distribution of squeezed light from a silicon nitride microresonator measured without photon number resolving detectors |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.13406 |