Measuring the Quantum State of Light

Abstract

A simple model of quantum trajectories Am.

Efficient simulation scheme for a class of quantum optics experiments with non-negative Wigner representation

“…Specifically, consider the case of measurement M of a Gaussian state G with covariance matrix V M . The POVM representation of this measurement is [27]…”

RETRACTED:Generation of Bright Squeezed Light from N Three-Level Atoms Pumped by a Coherent Light: Open Quantum System

“…Squeezed states of light has played a crucial role in the development of quantum physics. Squeezing is one of the nonclassical features of light that have been extensively studied by several authors [1]- [8]. In a squeezed state the quantum noise in one quadrature is below the vacuum-state level or the coherent-state level at the expense of enhanced fluctuations in the conjugate quadrature, with the product of the uncertainties in the two quadratures satisfying the uncertainty relation [1] [2] [4] [9].…”

“…Because of the quantum noise reduction achievable below the vacuum level, squeezed light has potential applications in the detection of week signals and in low-noise communications [1] [3]. Squeezed light can be generated by various quantum optical processes such as subharmonic generations [1]- [5] [10]- [12], four-wave mixing [13] [14], resonance fluorescence [6] [7], second harmonic generation [8] [15], and three-level laser under certain conditions [1] [3] [4] [9] [16]- [27]. Hence it proves useful to find some convenient means of generating a bright squeezed light.…”

Single-photon quantum nonlocality: Violation of the Clauser-Horne-Shimony-Holt inequality using feasible measurement setups

“…1). The resulting photoelectric current is related to the expectation value of a field quadrature operator via the result X θ = ∆I/( √ 2|α LO |), where ∆I is the intensity difference, α LO is the amplitude of the local oscillator field (a laser field), and θ is the phase of the local oscillator [32]. To adopt this detection technique in the CHSH scheme, one must subject an outcome to a binary binning process: when a measurement outcome falls within a certain region, Z + , on the real line we assign a value +1, whereas if it falls in the rest of the real line, Z − , we assign a value −1.…”