Conditional generation of multiphoton-subtracted squeezed vacuum states: loss consideration and operator description

TL;DR

This paper provides a comprehensive operator-based analysis of lossy multiphoton-subtracted squeezed vacuum states, including analytical formulas and simulations for their properties, considering losses at all stages of the process.

Contribution

It offers a detailed operator description and analytical expressions for MSSVSs with loss considerations, extending previous work by including all optical field stages and loss effects.

Findings

Losses significantly affect success probability and squeezing.

Analytical expressions for photon-number distribution and Wigner function are derived.

Numerical simulations illustrate the impact of losses on state properties.

Abstract

In terms of the characteristic functions of the quantum states, we present a complete operator description of a lossy photon-subtraction scheme. Feeding a single-mode squeezed vacuum into a variable beam splitter and counting the photons in one of the output channels, a broad class of multiphoton-subtracted squeezed vacuum states (MSSVSs) can be generated in other channel. Here the losses are considered in the beginning and the end channels in the circuit. Indeed, this scheme has been discussed in Ref. [Phys. Rev. A 100, 022341 (2019)]. However, different from the above work, we give all the details of the optical fields in all stages. In addition, we present the analytical expressions and numerical simulations for the success probability, the quadrature squeezing effect, photon-number distribution and Wigner function of the MSSVSs. Some interesting results effected by the losses are obtained.