Single-Photon-Subtracted-Squeezed-Vacuum-State Based Postselected Weak Measurement and its Applications

TL;DR

This paper explores how postselected weak measurements enhance the nonclassical properties of single-photon-subtracted squeezed vacuum states, improving quantum state features and signal-to-noise ratio for quantum information applications.

Contribution

It demonstrates that postselected von Neumann measurement optimizes nonclassical features of SPSSVS, including squeezing and photon statistics, with potential benefits for quantum information processing.

Findings

Postselected measurement enhances squeezing and nonclassicality.

Improved signal-to-noise ratio over non-postselected schemes.

Potential applications in quantum information processing.

Abstract

In this paper, we study the effects of postselected von Neumann measurement on the nonclassicality of the Single-Photon-Subtracted-Squeezed-Vacuum-State (SPSSVS). We calculate the squeezing effect, Mandel factor, Wigner function, signal-to-noise ratio (SNR)s and state distance function.We found that postselected von Neumann measurement has positive effects on the optimization of SPSSVS. In particular, by properly choosing the anomalous weak value, the nonclassical inherent features of SPSSVS such as squeezing, photon statistics and phase space distribution can be optimized significantly. The advantages of postselected weak measurement on improving the SNR compared to non-postselected measurement scheme is also confirmed. The superiority of SPSSVS based postselected weak measurement in quantum state optimization may have potential applications of in the associated quantum information processing.