# Transfer of a Polaritonic Qubit through a Coupled Cavity Array

## TL;DR

This paper presents a method for quantum communication using a coupled cavity array doped with two-level systems, enabling heralded quantum state transfer and network communication.

## Contribution

It introduces a scheme for transferring a polaritonic qubit through a coupled cavity array with photon blockade, allowing heralded quantum communication.

## Key findings

- Successful simulation of dual rail quantum state transfer
- Heralded quantum information arrival via fluorescence measurement
- Quantum communication possible between any cavity pair in the network

## Abstract

We demonstrate a scheme for quantum communication between the ends of an array of coupled cavities. Each cavity is doped with a single two level system (atoms or quantum dots) and the detuning of the atomic level spacing and photonic frequency is appropriately tuned to achieve photon blockade in the array. We show that in such a regime, the array can simulate a dual rail quantum state transfer protocol where the arrival of quantum information at the receiving cavity is heralded through a fluorescence measurement. Communication is also possible between any pair of cavities of a network of connected cavities.