Virtual-photon-induced quantum phase gates for two distant atoms trapped in separate cavities

TL;DR

This paper presents a scheme for implementing quantum gates between two distant atoms in separate cavities via virtual photon interactions, enabling scalable quantum networks without photon excitation.

Contribution

The proposed method achieves long-distance quantum gates without photon excitation or transport, enhancing robustness against decoherence and advancing quantum networking capabilities.

Findings

Gate operation is insensitive to thermal photon decoherence.

No photon excitation or transport occurs during the gate.

The scheme supports scalable quantum information processing.

Abstract

We propose a scheme for implementing quantum gates for two atoms trapped in distant cavities connected by an optical fiber. The effective long-distance coupling between the two distributed qubits is achieved without excitation and transportation of photons through the optical fiber. Since the cavity modes and fiber mode are never populated and the atoms undergo no transitions, the gate operation is insensitive to the decoherence effect when the thermal photons in the environment are negligible. The scheme opens promising perspectives for networking quantum information processors and implementing distributed and scalable quantum computation.