Abstract
The transfer of quantum entanglement (or quantum coherence) is not only fundamental in quantum mechanics but also important in quantum information processing. We here propose a way to achieve the coherent transfer of W-class entangled states of qubits among different cavities. Because no photon is excited in each cavity, decoherence caused by the photon decay is suppressed during the transfer. In addition, only one coupler qubit and one operational step are needed and no classical pulses are used in this proposal; thus, the engineering complexity is much reduced and the operation is greatly simplified. We further give a numerical analysis showing that high-fidelity transfer of a three-qubit W state is feasible within the present circuit QED technique. The proposal can be applied to a wide range of physical implementations with various qubits such as quantum dots, nitrogen vacancy centers, atoms, and superconducting qubits.
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Acknowledgments
C.P.Y. was supported in part by the National Natural Science Foundation of China under Grant Nos. 11074062 and 11374083, the Zhejiang Natural Science Foundation under Grant No. LZ13A040002, and the Funds from Hangzhou Normal University under Grant Nos. HSQK0081 and PD13002004. Q.P.S. was supported in part by the National Natural Science Foundation of China under Grant Nos. 11504075 and 11247008 and the Zhejiang Natural Science Foundation under Grant No. LQ12A05004. This work was also supported by the Funds of Hangzhou City for the Hangzhou City Quantum Information and Quantum Optics Innovation Research Team.
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Su, QP., Liu, T. & Yang, CP. Transferring multipartite entanglement among different cavities. Quantum Inf Process 15, 215–231 (2016). https://doi.org/10.1007/s11128-015-1153-3
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DOI: https://doi.org/10.1007/s11128-015-1153-3