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Directly measuring the concurrence of atomic two-qubit states through the detection of cavity decay

Li-Hua Zhang, Ming Yang, Zhuo‐Liang Cao

The European Physical Journal DMay 1, 201412 citations

The Relation of Concurrence and Purity for Multi-Qubit of Pure States

Wei Jin, Peilin Zhao, Junling Che +1 more

International Journal of Theoretical PhysicsJul 10, 20201 citation

Simple Scheme for Directly Measuring Concurrence of Two-Qubit Pure States in One Step

Rong‐Can Yang, Lin Xiu, Zhiping Huang +1 more

In the present work, a simple scheme for the direct measurement of the concurrence of two-qubit pure states is proposed. The scheme is based on trapped ions and only needs one step when the two identical pure states are given. The vibrational mode in our proposal is only virtually excited, which is important in view of decoherence. Furthermore, the scheme is feasible based on current technologies.

Communications in Theoretical PhysicsFeb 1, 200913 citations

Application of quantum algorithms to direct measurement of concurrence of a two-qubit pure state

Hong‐Fu Wang, Zhang Shou

This paper proposes a method to measure directly the concurrence of an arbitrary two-qubit pure state based on a generalized Grover quantum iteration algorithm and a phase estimation algorithm. The concurrence can be calculated by applying quantum algorithms to two available copies of the bipartite system, and a final measurement on the auxiliary working qubits gives a better estimation of the concurrence. This method opens new prospects of entanglement measure by the application of quantum algorithms. The implementation of the protocol would be an important step toward quantum information processing and more complex entanglement measure of the finite-dimensional quantum system with an arbitrary number of qubits.This paper proposes a method to measure directly the concurrence of an arbitrary two-qubit pure state based on a generalized Grover quantum iteration algorithm and a phase estimation algorithm. The concurrence can be calculated by applying quantum algorithms to two available copies of the bipartite system, and a final measurement on the auxiliary working qubits gives a better estimation of the concurrence. This method opens new prospects of entanglement measure by the application of quantum algorithms. The implementation of the protocol would be an important step toward quantum information processing and more complex entanglement measure of the finite-dimensional quantum system with an arbitrary number of qubits.

Chinese Physics BJul 1, 200910 citations

Observable Correlations in Two-Qubit States

Shunlong Luo, Qiang Zhang

Journal of Statistical PhysicsJul 1, 200941 citations

Continuous measurement of two qubits

MAO W, D. V. Averin, Rosario Fazio +1 more

Jan 1, 20050 citations

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