Quantum teleportation of hybrid qubits and single-photon qubits using Gaussian resources

TL;DR

This study compares the effectiveness of hybrid and single-photon qubits in quantum teleportation over Gaussian channels, revealing conditions under which each type performs better and analyzing the impact of photon losses.

Contribution

It introduces a comparative analysis of hybrid and photonic qubits in quantum teleportation using Gaussian resources, highlighting their relative advantages and robustness.

Findings

Hybrid qubits outperform photonic qubits at low coherent amplitudes.

Photonic qubits perform better at higher amplitudes.

Photon losses degrade teleportation fidelity but do not change the overall character.

Abstract

In this paper, we compare single-photon qubits and hybrid qubits as information carriers through quantum teleportation using a Gaussian continuous-variable channel. A hybrid qubit in our study is in the form of entanglement between a coherent state and a single photon. We find that hybrid qubits outperform photonic qubits when coherent amplitudes of the hybrid qubits are as low as $\alpha\lesssim 1$, while photonic qubits yield better results for larger amplitudes. We analyze effects of photon losses, and observe that the overall character of teleportation for different qubits remains the same although the teleportation fidelities are degraded by photon losses. Our work provides a comparative look at practical quantum information processing with different types of qubits.