Quantum-state transfer in staggered coupled-cavity arrays

TL;DR

This paper demonstrates high-fidelity quantum-state transfer in a staggered coupled-cavity array by exploiting bi-localized modes and modular design to optimize transfer speed and fidelity.

Contribution

It introduces a novel approach using staggered couplings and bi-localized modes for efficient quantum-state transfer in coupled-cavity arrays.

Findings

Bi-localized modes enable high-fidelity QST.

Modular array design shortens QST time.

Resonance conditions optimize transfer regimes.

Abstract

We consider a coupled-cavity array, where each cavity interacts with an atom under the rotating-wave approximation. For a staggered pattern of inter-cavity couplings, a pair of field normal modes each bi-localized at the two array ends arise. A rich structure of dynamical regimes can hence be addressed depending on which resonance condition between the atom and field modes is set. We show that this can be harnessed to carry out high-fidelity quantum-state transfer (QST) of photonic, atomic or polaritonic states. Moreover, by partitioning the array into coupled modules of smaller length, the QST time can be substantially shortened without significantly affecting the fidelity.