Unambiguous atomic Bell measurement assisted by multiphoton states

TL;DR

This paper proposes a method for unambiguous Bell measurement of atomic qubits using multiphoton states and resonant atom-field interactions in optical cavities, enabling potential advances in quantum communication.

Contribution

It introduces a novel scheme for unambiguous Bell measurement leveraging multiphoton states and postselection, advancing quantum measurement techniques.

Findings

Unambiguous Bell measurement achievable via projection onto coherent states.

Method enables potential quantum repeater components.

Theoretical analysis confirms feasibility of the approach.

Abstract

We propose and theoretically investigate an unambiguous Bell measurement of atomic qubits assisted by multiphoton states. The atoms interact resonantly with the electromagnetic field inside two spatially separated optical cavities in a Ramsey-type interaction sequence. The qubit states are postselected by measuring the photonic states inside the resonators. We show that if one is able to project the photonic field onto two coherent states on opposite sites of phase space, an unambiguous Bell measurement can be implemented. Thus our proposal may provide a core element for future components of quantum information technology such as a quantum repeater based on coherent multiphoton states, atomic qubits and matter-field interaction.