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Hybrid double-dot qubit measurement with a quantum point contact

Hybrid double-dot qubit measurement with a quantum point contact
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摘要 We present the measurement of a hybrid double-dot qubit using a quantum point contact (QPC). To study the dy- namics, we derive the rate equations of the entire system. Numerical results show that QPC current can directly reflect the evolution of the qubit. By adjusting Coulomb interaction, energy mismatch, and QPC tunneling rate, the efficiency and dephasing time can be improved. In addition, the initial state with a hybrid triplet state is superior to that with the purely triplet states on the efficiency. Moreover, the decoherence time is estimated on the magnitude of a microsecond, long enough to implement quantum operations. We present the measurement of a hybrid double-dot qubit using a quantum point contact (QPC). To study the dy- namics, we derive the rate equations of the entire system. Numerical results show that QPC current can directly reflect the evolution of the qubit. By adjusting Coulomb interaction, energy mismatch, and QPC tunneling rate, the efficiency and dephasing time can be improved. In addition, the initial state with a hybrid triplet state is superior to that with the purely triplet states on the efficiency. Moreover, the decoherence time is estimated on the magnitude of a microsecond, long enough to implement quantum operations.
机构地区 Institute of Physics
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第10期17-23,共7页 中国物理B(英文版)
基金 Project supported by the National Natural Science Foundation of China(Grant No.11174358) the National Basic Research Program of China(Grant No.2010CB833102)
关键词 MEASUREMENT DYNAMICS DEPHASING measurement, dynamics, dephasing
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