Near-perfect quantum teleportation between continuous and discrete encodings

TL;DR

This paper demonstrates near-perfect quantum teleportation between discrete-variable single-photon states and continuous-variable coherent states using hybrid entanglement and nonlinear optics, surpassing previous success probabilities.

Contribution

It introduces a method employing cross-Kerr nonlinearity and linear optics to achieve almost perfect teleportation from DV to CV encodings, a significant improvement over prior limitations.

Findings

Near-unit success probability for CV to DV teleportation.

Almost perfect teleportation from DV to CV achieved.

Utilization of cross-Kerr nonlinearity enhances teleportation fidelity.

Abstract

Quantum teleportation between polarized single-photon and phase-opposite coherent states is studied using a hybrid entangled resource and entangled coherent states. The polarized single-photon qubit represents a discrete-variable (DV) quantum system, whereas the phase-opposite coherent-state qubit constitutes a continuous-variable (CV) system. While teleportation from CV to DV can be achieved with near-unit success probability, the reverse process is usually limited to a maximum success probability of $1/2$. We demonstrate that, by employing cross-Kerr nonlinearity together with passive linear optical components such as polarizing beam splitters, beam splitters, and phase shifters, almost perfect teleportation from DV to CV encodings can also be achieved.