Quantum information processing and multiatom entanglement engineering with a thermal cavity

TL;DR

This paper presents a fast, thermal-field-insensitive scheme for two-qubit quantum gates and multiatom entanglement in a thermal cavity, advancing quantum information processing with atomic systems.

Contribution

It introduces a novel method to implement quantum gates and generate multiatom entanglement in thermal cavities, overcoming thermal field sensitivity.

Findings

The scheme achieves high-speed gate operation at specific detuning.

It effectively cancels photon-number dependent evolution components.

The method is extendable to multiatom entangled state generation.

Abstract

We propose a scheme for realizing two-qubit quantum phase gates with atoms in a thermal cavity. The photon-number dependent parts in the evolution operator are canceled with the assistant of a strong classical field. Thus the scheme is insensitive to the thermal field. In the scheme the detuning between the atoms and the cavity is equal to the atom-cavity coupling strength and thus the gates operate at a high speed, which is also important in view of decoherence. The scheme can be generalized to generate multiatom entangled states with a thermal cavity.