Quantum nondemolition measurement of the Werner state

TL;DR

This paper proposes a theoretical scheme for quantum nondemolition measurement of the Werner state, applicable to separated qubits, with robustness against dissipation, and discusses potential experimental realization using cavity QED.

Contribution

It introduces a novel scheme for nondemolition measurement of Werner states, extending to separated qubits and considering experimental feasibility with cavity QED.

Findings

Scheme is robust against dissipative effects.

Applicable to both local and separated qubits.

Potential for experimental implementation with cavity QED.

Abstract

We propose a theoretical scheme of quantum nondemolition measurement of two-qubit Werner state. We discuss our scheme with the two qubits restricted in a local place and then extend the scheme to the case in which two qubits are separated. We also consider the experimental realization of our scheme based on cavity quantum electrodynamics. It is very interesting that our scheme is robust against the dissipative effects introduced by the probe process. We also give a brief interpretation of our scheme finally.