Quantum teleportation between a continuous-variable optical qumode and a discrete-variable solid-state qubit

TL;DR

This paper proposes a hybrid quantum teleportation scheme between a continuous-variable optical qubit and a discrete solid-state qubit, enabling high-fidelity transfer over realistic conditions for quantum networks.

Contribution

It introduces a novel hybrid entanglement-based teleportation method using light homodyne detection and spin measurement, achieving near-deterministic transfer between different quantum encodings.

Findings

Teleportation fidelity exceeds classical limit under realistic noise conditions.

The scheme enables substantial teleportation distances with high success probability.

A new Bell-state measurement method relies only on light homodyne detection and spin polarization.

Abstract

Quantum teleportation is a fundamental ingredient for quantum information science and technology. In particular, the ability to perform quantum teleportation between quantum systems of different natures and encoding types is crucial for building complex systems, such as distributed quantum internet. Here we propose a scheme to teleport a continuous variable optical qubit, encoded in an optical qumode by means of a superposed coherent state, onto a discrete variable solid-state qubit, associated with a single nitrogen-vacancy center spin in diamond, via a hybrid entanglement. By using a newly developed method for Bell-state measurement, which relies only on light homodyne detection and spin polarization measurement, near-deterministic and -perfect quantum teleportation can be achieved for large coherent-state amplitude input. Taking noise effects into account, we find that the average teleportation fidelity can still exceed the classical limit, enabling substantial teleportation distances under realistic experimental conditions.