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One-step quantum phase gate in the ultrastrong coupling regime of circuit QED

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Abstract

In a previous publication (Phys Rev Lett 108: 120501, 2012), Romero et al. proposed an ultrastrong coupling circuit QED system that can implement a two-qubit quantum phase gate with four controlling pulses. Based on this architecture, we demonstrate that an ultrafast two-qubit phase gate can also be realized with only one oscillation and lower coupling strengths. In our operation scheme, two identical qubits evolve synchronously under a single pulse with a duration determined by a specific coupling strength. The phase gate can also be obtained periodically. The influences of parameter fluctuations are estimated. We demonstrate that the fidelities can be greater than 99% if the parameter fluctuations are controlled within 5%.

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Acknowledgements

This work was supported by the National Basic Research Program of China under Grant No. 2013CBA01702, and the National Natural Science Foundation of China under Grant Nos. 61377016, 61575055, 11104049, 61601196 and 10974039, and Specialized Research Fund for the Doctoral Program of Higher education (Grant 20102302120009) and the Program for New Century Excellent Talents in University (NCET-12-0148) and Doctoral Foundation of University of Jinan Grant No. XBS1637.

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Authors and Affiliations

  1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Xuexin Xu, Keya Zhou & Shutian Liu

  2. School of Physics and Technology, University of Jinan, Jinan, 250022, Shandong, People’s Republic of China

    Xin Liu

  3. Department of Electronic Information Engineering, Nanchang University, Nanchang, 330031, People’s Republic of China

    Qinghong Liao

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  1. Xuexin Xu
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Correspondence to Shutian Liu.

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Xu, X., Liu, X., Liao, Q. et al. One-step quantum phase gate in the ultrastrong coupling regime of circuit QED. Quantum Inf Process 16, 214 (2017). https://doi.org/10.1007/s11128-017-1642-7

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