Coherent quantum effects through dispersive bosonic media

TL;DR

This paper demonstrates how two atomic qubits can achieve high-fidelity entangling gates through a dispersive bosonic medium, even with many mediating modes, considering losses and imperfections.

Contribution

It introduces a method for implementing high-fidelity entangling gates via dispersive bosonic media with multiple modes, accounting for realistic imperfections.

Findings

High-fidelity entangling gates are achievable with many mediating modes.

Losses and imperfections have quantifiable effects on gate performance.

Dispersive interactions enable robust quantum gate operations.

Abstract

The coherent evolution of two atomic qubits mediated by a set of bosonic field modes is investigated. By assuming a specific encoding of the quantum states in the internal levels of the two atoms we show that entangling quantum gates can be realised, with high fidelity, even when a large number of mediating modes is involved. The effect of losses and imperfections on the gates' operation is also considered in detail.