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

Frontiers in Optics

Measurement of Conditional Squeezing for non-Gaussian fields

Justin E. Vines, Reeta Vyas, Surendra Singh

Published Jan 1, 2006• 0 citations
Publisher

Abstract

A scheme based on homodyne detection for measuring conditional quadrature fluctuations for non-Gaussian fields is proposed. Results for light from parametric oscillators and fluorescence from an atom in a high-Q cavity are discussed.
DOI
10.1364/ls.2006.ltug3

Related papers

Conditional homodyne detection of light with squeezed quadrature fluctuations

Justin E. Vines, Reeta Vyas, Surendra Singh

We discuss the detection of field quadrature fluctuations in conditional homodyne detection experiments and possible sources of error in such an experiment. We also present modifications to these experiments to help eliminate such errors and extend their range of applicability.

Physical Review A•Aug 24, 2006•6 citations

Non-Gaussian entanglement criteria for atomic homodyne detection

Jaehak Lee, Jiyong Park, Jaewan Kim +2 more

Homodyne measurement is a crucial tool widely used to address continuous variables for bosonic quantum systems. While an ideal homodyne detection provides a powerful analysis, e.g., to effectively measure quadrature amplitudes of light in quantum optics, it relies on the use of a strong reference field, the so-called local oscillator, typically in a coherent state. Such a strong coherent local oscillator may not be readily available, particularly for a massive quantum system like a Bose-Einstein condensate, posing a substantial challenge in dealing with continuous variables appropriately. It is necessary to establish a practical framework that includes the effects of nonideal local oscillators for a rigorous assessment of various quantum tests and applications. We here develop entanglement criteria beyond a Gaussian regime applicable for this realistic homodyne measurement that do not require assumptions on the state of local oscillators. We discuss the working conditions of homodyne detection to effectively detect non-Gaussian quantum entanglement under various states of local oscillators.

arXiv:2401.01228•Physical Review A•Feb 14, 2023•1 citation

Giant violations of classical inequalities by the quantum fluctuations of squeezed light

H. J. Carmichael, H. M. Castro-Beltrán, G. T. Foster +1 more

Summary form only given. The squeezing of an optical field is normally observed in the frequency domain using balanced homodyne detection to measure the fluctuation variance of a selected quadrature amplitude. The scheme amounts to a measurement of sub-Poissonian photon statistics and is sensitive to efficiencies as any such unconditional measurement is. Conditional measurements are independent of efficiencies. We propose a conditional homodyne detection scheme for observing the amplitude fluctuations of squeezed light. The central idea is to sample the photocurrent by triggering on a photon count and hence realize an efficiency independent measurement that resolves the quantum fluctuations in time. Our scheme directly measures the correlation function.

Quantum Electronics and Laser Science Conference•May 12, 2000•0 citations

Large Asymmetric Fluctuations in the Resonance Fluorescence of a Three-Level Atom

H. M. Castro-Beltrán, Luis Gutiérrez, E. R. Marquina-Cruz

The quadrature fluctuations of the fluorescence of the weak transition of a bichromatically driven V-type three-level atom are shown to be asymmetric and giant under conditional homodyne detection, signaling non-Gaussian fluctuations.

Latin America Optics and Photonics Conference•Jan 1, 2014•1 citation

Conditional detection of fluctuations in the light form an atom in a high Q-cavity

Justin Vines, Reeta Vyas, Surendra Singh

Analytical expressions for the conditional intensity and quadrature fluctuations of the light from an atom in a high-Q cavity are derived. Fluctuations of both the squeezed and unsqueezed quadratures are shown to be nonclassical.

Frontiers in Optics•Jan 1, 2005•0 citations

Emergence and degradation of squeezing in resonance fluorescence

H. M. Castro-Beltrán, José R. Herrera-Garza, Levente Horvath

Using master equation and quantum Monte Carlo wavefunction approaches, we study the circumstances surrounding the emergence and degradation of the elusive squeezing of fluctuations in two-level atom resonance fluorescence. For its measurement we suggest conditional homodyne detection (CHD) [G.T. Foster, L.A. Orozco, H.M. Castro-Beltran, H.J. Carmichael, Phys. Rev. Lett. 85, pp. 3149-3152, 2000], which is nearly independent of detector efficiencies, which have harmed previous attemps. Squeezing in resonance fluorescence requires a weak laser, so the average interval between emitted photons is much longer than the regression time to the steady state; here, the spectrum of the out-of-phase quadrature is a negative peak. In CHD, moderate fields generate a non-zero third-order correlation in the dipole fluctuations that contaminates squeezing, making the noise non- Gaussian. If the probability to emit two and even three close photons is still small the additional contribution is also negative, helping to make the full spectrum a bit larger and easier to measure. Strong driving spreads the photoemission distribution, which destroys squeezing, and the third order fluctuations become responsible for the non-classicality of the fluorescence.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Aug 10, 2011•0 citations
Homodyne measurement is a crucial tool widely used to address continuous variables for bosonic quantum systems. While an ideal homodyne detection provides a powerful analysis, e.g., to effectively measure quadrature amplitudes of light in quantum optics, it relies on the use of a strong reference field, the so-called local oscillator, typically in a coherent state. Such a strong coherent local oscillator may not be readily available, particularly for a massive quantum system like a Bose-Einstein condensate, posing a substantial challenge in dealing with continuous variables appropriately. It is necessary to establish a practical framework that includes the effects of nonideal local oscillators for a rigorous assessment of various quantum tests and applications. We here develop entanglement criteria beyond a Gaussian regime applicable for this realistic homodyne measurement that do not require assumptions on the state of local oscillators. We discuss the working conditions of homodyne detection to effectively detect non-Gaussian quantum entanglement under various states of local oscillators.
Summary form only given. The squeezing of an optical field is normally observed in the frequency domain using balanced homodyne detection to measure the fluctuation variance of a selected quadrature amplitude. The scheme amounts to a measurement of sub-Poissonian photon statistics and is sensitive to efficiencies as any such unconditional measurement is. Conditional measurements are independent of efficiencies. We propose a conditional homodyne detection scheme for observing the amplitude fluctuations of squeezed light. The central idea is to sample the photocurrent by triggering on a photon count and hence realize an efficiency independent measurement that resolves the quantum fluctuations in time. Our scheme directly measures the correlation function.
Using master equation and quantum Monte Carlo wavefunction approaches, we study the circumstances surrounding the emergence and degradation of the elusive squeezing of fluctuations in two-level atom resonance fluorescence. For its measurement we suggest conditional homodyne detection (CHD) [G.T. Foster, L.A. Orozco, H.M. Castro-Beltran, H.J. Carmichael, Phys. Rev. Lett. 85, pp. 3149-3152, 2000], which is nearly independent of detector efficiencies, which have harmed previous attemps. Squeezing in resonance fluorescence requires a weak laser, so the average interval between emitted photons is much longer than the regression time to the steady state; here, the spectrum of the out-of-phase quadrature is a negative peak. In CHD, moderate fields generate a non-zero third-order correlation in the dipole fluctuations that contaminates squeezing, making the noise non- Gaussian. If the probability to emit two and even three close photons is still small the additional contribution is also negative, helping to make the full spectrum a bit larger and easier to measure. Strong driving spreads the photoemission distribution, which destroys squeezing, and the third order fluctuations become responsible for the non-classicality of the fluorescence.