Multi-photon quantum communication in quantum networks

TL;DR

This paper introduces a multiphoton-state coherent transport protocol in quantum networks that enables swap gates without external modulation, analyzes its extension to longer chains, and studies decoherence effects.

Contribution

It presents a novel multiphoton transport protocol in coupled-resonator networks that operates without external modulation or coupling engineering, and investigates decoherence impacts.

Findings

Achieved multiphoton swap gate without external modulation.

Extended protocol to arbitrary-length chains with varying couplings.

Analyzed decoherence effects from quantum fluctuations and thermal baths.

Abstract

We propose and analyze a multiphoton-state coherent transport protocol in a coupled-resonator quantum network. A multiphoton swap gate between two antipodes can be achieved with neither external modulation nor coupling strength engineering. Moreover, we extend this result to a coupled-resonator chain of arbitrary length with different coupling strengths. Effects of decoherence via quantum nondemolition interaction are studied with sources including vacuum quantum fluctuation and bath thermal excitations when the bath is in the thermal equilibrium state. These observations are helpful to understand the decoherence effects on quantum communication in quantum coupled-resonator systems.