Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Generation of sub-Poissonian pulses of light

Ruo-Ding Li, Sang-Kyung Choi, Chonghoon Kim, Prem Kumar

Published May 1, 1995• 20 citations
Publisher

Abstract

Sub-Poissonian pulses of light are generated by means of traveling-wave optical parametric deamplification. Upon direct detection the quantum noise on the deamplified pulses is measured to be below the shot-noise limit by as much as 0.5\ifmmode\pm\else\textpm\fi{}0.2 dB (11\ifmmode\pm\else\textpm\fi{}4 %). The parametric-gain dependence of the measured Fano factor---direct-detection noise as a fraction of the shot-noise limit---agrees with the quantum theory of the amplifier when diffraction effects are taken into account.

DOI
10.1103/physreva.51.r3429

Related papers

Gaussian-wave theory of sub-Poissonian light generation by means of travelling-wave parametric deamplification

Ruo-Ding Li, S -K Choi, Prem Kumar

A Gaussian wave theory is developed to analyse the sub-Poissonian light generated by means of a travelling-wave optical parametric deamplification. The Gaussian spatial profile of the pump beam limits the observable Fano factor to -3 dB (0.5). Gain-induced diffraction of the signal beam and classical fluctuations of the pump-signal relative phase cause further degradation. The theory is compared with our recent experimental results, and excellent agreement is found after the effect of non-ideal photoelectron efficiency is taken into account.

Quantum and Semiclassical Optics Journal of the European Optical Society Part B•Aug 1, 1995•3 citations

Observation of sub-Poissonian light in traveling-wave second-harmonic generation

Sun-Hyun Youn, Sang-Kyung Choi, Prem Kumar +1 more

We report the generation of sub-Poissonian pulses of light by means of traveling-wave second-harmonic generation (SHG) in a type II phase-matched nonlinear crystal. On direct detection, the quantum noise on the output light, which is polarized orthogonally to the input fundamental field, is measured to be below the shotnoise limit by as much as 0.3 +/- 0.2 dB (6 +/- 4%). We show that the input fundamental-power dependence of the measured Fano factor, direct-detection noise as a fraction of the shot-noise limit, is in qualitative agreement with the quantum theory of SHG.

Optics Letters•Oct 1, 1996•22 citations

Amplitude squeezing of light by means of a phase-sensitive fiber parametric amplifier

Dmitry Levandovsky, Michael Vasilyev, Prem Kumar

We experimentally demonstrate generation of bright sub-Poissonian light by means of parametric deamplification in a phase-sensitive fiber amplifier that is based on a balanced nonlinear Sagnac interferometer. On direct detection, the photocurrent noise falls below the shot-noise limit by (0.6 +/- 0.2) dB (1.4 dB when corrected for detection losses). To observe the noise reduction we employed a scheme that used two orthogonally polarized pulses to cancel the noise that arises from the predominantly polarized guided-acoustic-wave Brillouin scattering in the fiber. We also present a simplified semiclassical theory of quantum-noise suppression by this amplifier, which is found to be in good agreement with the experimental results.

Optics Letters•Jul 15, 1999•65 citations

Use of parametric down-conversion to generate sub-Poissonian light

P. R. Tapster, John Rarity, J.S. Satchell

Two highly noise-correlated light beams are generated by nondegenerate parametric down-conversion. We report the production of sub-Poissonian light in one of the beams by using negative feedback (to the pump) from the other. This nonclassical light source has a postdetection Fano factor of 0.78 over a limited frequency range near 50 Hz with an intensity of about 60 pW.

Physical Review A•Apr 1, 1988•81 citations

Sub-shot-noise measurements with pulsed twin beams of light

Jianming Huang, Orhan Aytür, Prem Kumar

Recently, we have observed as much as 7 dB of quantum-noise reduction in the direct difference detection of twin-beam signal and idler outputs from a traveling-wave optical parametric amplifier (OPA).1 The OPA, which consists of a type-II phase-matched KTiOPO4 crystal, is pumped by the second harmonic of a mode-locked and Q-switched Nd:YAG laser. Here we describe an experiment in which we used these twin-beam pulses to improve on the optimal (shot-noise-limited) direct-detection signal-to-noise ratio (SNR) that can be achieved with coherent-state pulses of light of the same peak power.

Annual Meeting Optical Society of America•Jan 1, 1990•0 citations

Observation of high-intensity sub-Poissonian light using an optical parametric oscillator

Jerome C. Mertz, A. Heidmann, Claude Fabre +2 more

We report the observation of high-intensity sub-Poissonian light using the correlated ``twin'' beams generated by an optical parametric oscillator. The intensity fluctuations in one of these beams are reduced by a feedforward correction mechanism that monitors the intensity of the second beam. The observed reduction in noise power is up to 24% below the shot-noise limit.

Physical Review Letters•Jun 11, 1990•101 citations
Sub-Poissonian pulses of light are generated by means of traveling-wave optical parametric deamplification. Upon direct detection the quantum noise on the deamplified pulses is measured to be below the shot-noise limit by as much as 0.5\ifmmode\pm\else\textpm\fi{}0.2 dB (11\ifmmode\pm\else\textpm\fi{}4 %). The parametric-gain dependence of the measured Fano factor---direct-detection noise as a fraction of the shot-noise limit---agrees with the quantum theory of the amplifier when diffraction effects are taken into account.
A Gaussian wave theory is developed to analyse the sub-Poissonian light generated by means of a travelling-wave optical parametric deamplification. The Gaussian spatial profile of the pump beam limits the observable Fano factor to -3 dB (0.5). Gain-induced diffraction of the signal beam and classical fluctuations of the pump-signal relative phase cause further degradation. The theory is compared with our recent experimental results, and excellent agreement is found after the effect of non-ideal photoelectron efficiency is taken into account.
We report the generation of sub-Poissonian pulses of light by means of traveling-wave second-harmonic generation (SHG) in a type II phase-matched nonlinear crystal. On direct detection, the quantum noise on the output light, which is polarized orthogonally to the input fundamental field, is measured to be below the shotnoise limit by as much as 0.3 +/- 0.2 dB (6 +/- 4%). We show that the input fundamental-power dependence of the measured Fano factor, direct-detection noise as a fraction of the shot-noise limit, is in qualitative agreement with the quantum theory of SHG.
We experimentally demonstrate generation of bright sub-Poissonian light by means of parametric deamplification in a phase-sensitive fiber amplifier that is based on a balanced nonlinear Sagnac interferometer. On direct detection, the photocurrent noise falls below the shot-noise limit by (0.6 +/- 0.2) dB (1.4 dB when corrected for detection losses). To observe the noise reduction we employed a scheme that used two orthogonally polarized pulses to cancel the noise that arises from the predominantly polarized guided-acoustic-wave Brillouin scattering in the fiber. We also present a simplified semiclassical theory of quantum-noise suppression by this amplifier, which is found to be in good agreement with the experimental results.
Recently, we have observed as much as 7 dB of quantum-noise reduction in the direct difference detection of twin-beam signal and idler outputs from a traveling-wave optical parametric amplifier (OPA).1 The OPA, which consists of a type-II phase-matched KTiOPO4 crystal, is pumped by the second harmonic of a mode-locked and Q-switched Nd:YAG laser. Here we describe an experiment in which we used these twin-beam pulses to improve on the optimal (shot-noise-limited) direct-detection signal-to-noise ratio (SNR) that can be achieved with coherent-state pulses of light of the same peak power.