Measuring the photon number distribution (PND) of optical states allows one to extract metrics of non-classicality of fundamental and technological relevance, but requires in principle the use of detectors with photon number resolving capabilities (PNR). Here 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, corresponding to an on-chip squeezing level of 6.2(2) dB and a noise reduction factor (photon number difference squeezing) of 3.8(2) dB. The analysis performed on the photon-number basis allows us to additionally characterize the influence of a spurious thermal background field that reduces the photon number correlations.
Squeezed light photon number statistics from a microresonator without photon number resolving detectors
Borghi M.;Brusaschi E.;Bacchi M.;Liscidini M.;Galli M.;Bajoni D.
2024-01-01
Abstract
Measuring the photon number distribution (PND) of optical states allows one to extract metrics of non-classicality of fundamental and technological relevance, but requires in principle the use of detectors with photon number resolving capabilities (PNR). Here 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, corresponding to an on-chip squeezing level of 6.2(2) dB and a noise reduction factor (photon number difference squeezing) of 3.8(2) dB. The analysis performed on the photon-number basis allows us to additionally characterize the influence of a spurious thermal background field that reduces the photon number correlations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
