Effect of Emitters on Quantum State Transfer in Coupled Cavity Arrays

TL;DR

This paper investigates how emitters affect quantum state transfer in coupled cavity arrays, introducing a Monte Carlo method to optimize couplings for high fidelity transfer and analyzing emitter placement effects.

Contribution

It presents a novel Monte Carlo approach to solve the inverse eigenvalue problem for optimizing quantum state transfer in cavity arrays with emitters.

Findings

Monte Carlo method effectively finds optimal couplings for high fidelity transfer

Emitter placement significantly influences transfer efficiency

Exact diagonalization reveals dynamics of polariton wave functions

Abstract

Over the last decade, conditions for perfect state transfer in quantum spin chains have been discovered, and their experimental realizations addressed. In this paper, we consider an extension of such studies to quantum state transfer in a coupled cavity array including the effects of atoms in the cavities which can absorb and emit photons as they propagate down the array. Our model is equivalent to previously examined spin chains in the one-excitation sector and in the absence of emitters. We introduce a Monte Carlo approach to the inverse eigenvalue problem which allows the determination of the inter-cavity and cavity-emitter couplings resulting in near-perfect quantum state transfer fidelity, and examine the time dependent polariton wave function through exact diagonalization of the resulting Tavis-Cummings-Hubbard Hamiltonian. The effect of inhomogeneous emitter locations is also evaluated.