Photon number distribution of squeezed light from a silicon nitride microresonator measured without photon number resolving detectors

• URL: http://arxiv.org/abs/2406.13406v1
• Date: Wed, 19 Jun 2024 09:54:05 GMT
• Title: Photon number distribution of squeezed light from a silicon nitride microresonator measured without photon number resolving detectors
• Authors: Emanuele Brusaschi, Massimo Borghi, Marcello Bacchi, Marco Liscidini, Matteo Galli, Daniele Bajoni,
• Abstract summary: The photon number distribution (PND) allows one to extract metrics of non-classicality of fundamental and technological relevance. 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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