Frequency up/down conversion by multiphoton pumping in superconducting qubit circuits
Frequency up/down conversion by multiphoton pumping in superconducting qubit circuits
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DOI：
10.1088/1361-6455/ab91e4
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
H. Jooya;G. Sun;J. Pan;P. Wu;S. Han
中科院分区：
文献类型：
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作者：
H. Jooya;G. Sun;J. Pan;P. Wu;S. Han
我们提出了一种在通量超导量子位电路中进行多光子频率上/下转换的通用方案，由一对靠近和远离量子位谐振调谐的微波驱动。通量量子位可以设计成具有强非谐性，使得两个最低本征态在能量上与较高本征态很好地分离。通过将量子位耦合到具有相同拉比频率的双色微波场，我们演示了三光子状态中两个最低能级之间的高阶非线性跃迁。向上和向下转换均通过多模式 Floquet 形式主义进行呈现和准确解释。直观的图论方法阐明了多光子泵浦和群体捕获的物理原理。解析解还说明了如何在广泛的频率范围内实现所需的单光子或多光子泵浦过程的可控性。所提出的设计和理论方法适用于维持未来超导量子机的互连性。
We propose a versatile scheme for multiphoton frequency up/down conversion in flux superconducting qubit circuits, driven by a pair of microwaves tuned near and far off the qubit resonance. Flux qubits can be engineered with strong anharmonicity such that the two lowest eigenstates are energetically well separated from the higher ones. We demonstrate the high order non-linear transitions between the two lowest levels in the three-photon regime, by coupling the qubit to bichromatic microwave fields with the same Rabi frequencies. Both up and down conversions are presented and accurately interpreted with many-mode Floquet formalism. An intuitive graph theoretic approach elucidates the physics of multiphoton pumping and population trapping. The analytical solutions also illustrate how controllability is achievable for desired single- or multiphoton pumping processes in a wide range of frequencies. The proposed design and theoretical approach are applicable in maintaining the inter-connectivity of future superconducting quantum machines.