Accurate Qubit Control with Single Flux Quantum Pulses
Accurate Qubit Control with Single Flux Quantum Pulses
复制标题
使用单通量量子脉冲进行精确的量子位控制
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Vavilov
中科院分区：
文献类型：
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作者：
R. McDermott;M. Vavilov
我们描述了用单通量量子脉冲的共振串代替微波对谐振子和量子比特模的相干操纵。我们证明了当脉冲间距等于振子的周期时，获得了相干旋转。我们考虑了一种制备亮和暗谐振子指针态的协议。接下来，我们分析一个两态量子比特系统的转动。我们计算了由于单通量量子脉冲的定时抖动和由于量子比特的弱非谐性引起的门误差。结果表明，在序列长度为20 ns的情况下，门的保真度可以达到99.9%以上。
We describe the coherent manipulation of harmonic oscillator and qubit modes using resonant trains of single flux quantum pulses in place of microwaves. We show that coherent rotations are obtained for pulse-to-pulse spacing equal to the period of the oscillator. We consider a protocol for preparing bright and dark harmonic oscillator pointer states. Next we analyze rotations of a two-state qubit system. We calculate gate errors due to timing jitter of the single flux quantum pulses and due to weak anharmonicity of the qubit. We show that gate fidelities in excess of 99.9% are achievable for sequence lengths of order 20 ns.