Flux qubit with a large loop size and tunable Josephson junctions |
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Authors: | Deng Hui Yu HaiFeng Xue Guang-Ming Tian Ye Ren Jian-Kun Wu Yu-Lin Huang Ke-Qiang Zhao Shi-Ping Zheng Dong-Ning |
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Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | We present the design of a superconducting flux qubit with a large loop inductance. The large loop inductance is desirable for coupling between qubits. The loop is configured into a gradiometer form that could reduce the interference from environmental magnetic noise. A combined Josephson junction, i.e., a DC-SQUID is used to replace the small Josephson junction in the usual 3-JJ (Josephaon junction) flux qubit, leading to a tunable energy gap by using an independent external flux line. We perform numerical calculations to investigate the dependence of the energy gap on qubit parameters such as junction capacitance, critical current, loop inductance, and the ratio of junction energy between small and large junctions in the flux qubit. We suggest a range of values for the parameters. |
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Keywords: | flux qubit four Josephson junctions tunable energy gap |
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