Nondestructive interaction-free atom-photon controlled-NOT gate

TL;DR

This paper introduces a probabilistic, nondestructive atom-photon controlled-NOT gate that leverages a ring resonator and Raman transitions, enabling high-fidelity quantum logic operations without destroying the photon or atom states.

Contribution

It proposes a novel nondestructive, interaction-free CNOT gate using atom-photon interactions with realistic ion-trap and resonator setups, advancing quantum information processing capabilities.

Findings

Achieves a 50% success probability for the gate operation.

Demonstrates strong atom-photon coupling in a realistic ion-trap setup.

Shows how the resonator can control superpositions of atomic states.

Abstract

We present a probabilistic (ideally 50%) nondestructive interaction-free atom-photon controlled-NOT gate, where nondestructive means that all four outgoing target photon modes of the gate are available and feed-forwardable. Individual atoms are controlled by a stimulated Raman adiabatic passage transition and photons by a ring resonator with two outgoing ports. Realistic estimates we obtain for ions confined in a Paul trap around which the resonator is mounted show that a strong atom-photon coupling can be achieved. It is also shown how the resonator can be used for controlling superposition of atom states.