Optimal teleportation fidelity and its deviation in noisy scenarios

TL;DR

This paper analyzes how noise in resource states and classical communication affects quantum teleportation fidelity and its variability, providing exact formulas and conditions for optimal, non-classical, and dispersion-free teleportation in noisy environments.

Contribution

It derives exact formulas for optimal fidelity and deviation in noisy teleportation, and identifies conditions for non-classical, dispersion-free teleportation despite noise.

Findings

Exact formulas for fidelity and deviation under noise

Conditions for non-classical and dispersion-free teleportation

Scenarios where increased entanglement degrades teleportation quality

Abstract

In this work, we study the combined effects of noisy resource state and noisy classical communication on teleportation fidelity and its deviation. Basically, we consider a teleportation protocol, where a general two-qubit state in canonical form is used as resource, which of course, can be a noisy entangled state. Thereafter, to teleport an unknown qubit, Alice measures her qubits in Bell basis and convey the measurement outcome to Bob via noisy classical channel(s). In particular, we derive the exact formulae of optimal teleportation fidelity and corresponding fidelity deviation where the resource state and the classical communication, both of them can be noisy. We further find conditions for non-classical fidelity and dispersion-free teleportation within the present protocol. In this way, we identify the noisy environments where it is possible to achieve the dispersion-free teleportation without compromising the non-classical fidelity. We also exhibit scenarios where the increase of entanglement in the resource state, may degrade the quality of teleportation. Finally, we discuss on minimum classical communication cost required to achieve non-classical fidelity in our protocol.