Entanglement and nonclassicality of photon-added two-mode squeezed thermal state

TL;DR

This paper introduces photon-added two-mode squeezed thermal states, analyzes their nonclassicality and entanglement properties, and demonstrates their potential usefulness for quantum teleportation, showing photon addition enhances entanglement more than subtraction.

Contribution

It presents a new class of entangled states created by photon addition to TMSTS, deriving their normalization and analyzing their nonclassicality and entanglement properties.

Findings

Photon addition enhances entanglement more effectively than photon subtraction.

Photon-added TMSTS exhibit significant nonclassicality as shown by Wigner function negativity.

Symmetrical photon-added TMSTS improve quantum teleportation performance.

Abstract

We introduce a kind of entangled state---photon-addition two-mode squeezed thermal state (TMSTS) by adding photons to each mode of the TMSTS. Using the P-representation of thermal state, the compact expression of the normalization factor is derived, a Jacobi polynomial. The nonclassicality is investigated by exploring especially the negativity of Wigner function. The entanglement is discussed by using Shchukin-Vogel criteria. It is shown that the photon-addtion to the TMSTS may be more effective for the entanglement enhancement than the photon-subtraction from the TMSTS. In addition, the quantum teleportation is also examined, which shows that symmetrical photon-added TMSTS may be more useful for quantum teleportation than the non-symmetric case.