Proposal for direct measurement of concurrence via visibility in a cavity QED system

TL;DR

This paper proposes an experimental method using cavity QED technology to directly measure the entanglement (concurrence) of a two-qubit cavity system through atomic visibility, applicable to any pure initial state.

Contribution

It introduces a novel scheme that links atomic visibility to concurrence, enabling direct measurement of entanglement in cavity QED systems.

Findings

The scheme can measure concurrence directly from atomic visibility.

It works for any pure initial state of the two-qubit cavity system.

The method leverages existing cavity QED technology with flying atoms.

Abstract

An experimental scheme is proposed that allows direct measurement of the concurrence of a two-qubit cavity system. It is based on the cavity-QED technology using atoms as flying qubits and relies on the identity of the two-particle visibility of the atomic probability with the concurrence of the cavity system. The scheme works for any arbitrary pure initial state of the two-qubit cavity system.