Application of quantum algorithms to direct measurement of concurrence of a two-qubit pure state |
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| Authors: | Wang Hong-Fu and Zhang Shou |
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| Affiliation: | Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China;Department of Physics, College of Science, Yanbian University, Yanji 133002, China |
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| Abstract: | 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. |
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| Keywords: | concurrence quantum algorithm entanglement measure |
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