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Fast population transfer and entanglement preparation among four superconducting flux qubits
Laser Physics Letters ( IF 1.7 ) Pub Date : 2020-08-26 , DOI: 10.1088/1612-202x/abab13
Peng Xu 1, 2, 3 , Sheng-Mei Zhao 1
Affiliation  

We propose a scheme whereby we optimized the driven pulses applied on qubits to realize fast and robust population of quantum state transfer and entanglement generation between four superconducting flux qubits based on adiabatic passage. The quantum state was transferred from one qubit to another directly with high fidelity through applying an inverted set of pulses. Moreover, the resident time of the quantum state populated on the qubits could be controlled by adjusting the time delay between the driven pulses during the transfer process. Analysis of the dynamics demonstrates that the scheme is insensitive to inhomogeneous qubit–resonator coupling, and even for large detuning regimes of the qubit–resonator interaction, high-fidelity quantum state transfer and entanglement generation can be obtained. Our results also show that the effect of decoherence due to resonator decay and qubit relaxation could be negligible with currently existing technology.

中文翻译:

四个超导通量量子位之间的快速种群转移和纠缠准备

我们提出了一种方案,通过该方案,我们可以优化施加在量子位上的驱动脉冲,以基于绝热通道实现四个超导通量量子位之间快速,稳健的量子态转移和纠缠生成。通过施加一组倒置的脉冲,量子态直接以高保真度从一个量子位转移到另一个量子位。此外,可以通过在传输过程中调整驱动脉冲之间的时间延迟来控制量子位上驻留的量子状态的驻留时间。动力学分析表明,该方案对不均匀的量子位-谐振器耦合不敏感,即使对于量子位-谐振器相互作用的大失谐状态,也可以获得高保真量子态转移和纠缠生成。
更新日期:2020-08-27
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