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Advances in Condensed Matter Physics

Geometric Phase in a Controllable Coupling of Superconducting Flux Qubits

元新 乔

Published Jan 1, 2017• 0 citations
Publisher

Abstract

几何相位是量子力学中的一个重要概念，通过使用Lewis-Riesenfeld不变理论，我们提出了超导磁通量子比特的可控耦合的几何相位。 Geometric phase is an important concept in quantum mechanics. By using the Lewis-Riesenfeld in-variant theory, we propose the Geometric phase in a controllable coupling of superconducting flux qubits.

DOI
10.12677/cmp.2017.63008

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几何相位是量子力学中的一个重要概念，通过使用Lewis-Riesenfeld不变理论，我们提出了超导磁通量子比特的可控耦合的几何相位。 Geometric phase is an important concept in quantum mechanics. By using the Lewis-Riesenfeld in-variant theory, we propose the Geometric phase in a controllable coupling of superconducting flux qubits.
通过使用Lewis-Riesenfeld不变量理论，我们研究了超导量子位的量子相干可调耦合中的几何相位。发现几何相位与隧道分裂，直流能量偏置和HF信号等无关。这一结果对量子计算有一定的意义。 By using the Lewis-Riesenfeld invariant theory, we have studied the geometric phase in a quantum coherent tunable coupling of superconducting qubits. The geometric phase has nothing to do with the tunnel splitting, but also the dc energy bias and the HF signal. This result has certain significance to the quantum computation.
通过使用Lewis-Riesenfeld不变量理论，我们研究了大约瑟夫逊结量子比特中拉比振荡的几何相位。发现几何相位与偏置电流的直流和微波脉冲无关，也与微波的转换频率无关。 By using the Lewis–Riesenfeld invariant theory, we have studied the geometric phase of Rabi oscillations in a large Josephson-junction qubit. The geometric phase has nothing to do with the dc and microwave pulses of bias current, and is independent of the transitions frequencies of microwaves.
通过使用Lewis-Riesenfeld不变理论，已经研究了具有双模运算符和相位运算符的广义Jaynes-Cummings模型中的几何相位。与动力学相位相比，一个周期情况下的几何相位与双光子场的频率无关，光子和原子之间的耦合系数以及原子跃迁频率。显然，几何相具有纯几何和拓扑特征，这意味着几何相位代表了厄米线性束中的和乐。 By using the Lewis-Riesenfeld invariant theory, the geometric phase in a generalized Jaynes-Cummings model with double mode operators and phase operators has been studied. Compared with the dynamical phase, the geometric phase in a cycle case is independent of the frequency of the double photon field, the coupling coefficient between photons and atoms, and the atom transition frequency. It is apparent that the geometric phase has the pure geometric and topological characteristics, which means that the geometric phase represents the holonomy in the Hermitian linear bundles.
利用Lewis-Riesenfeld不变量理论，研究了推广的含时二能级虚光子过程的 Jaynes-Cummings模型。发现周期情况下的几何相位与光子场的频率、光子和原子之间的耦合系数以及原子跃迁频率无关。 By using the Lewis-Riesenfeld invariant theory, we have studied the geometric phase in a generalized time-dependent Jaynes-Cummings model with imaginary photon process for two-level atoms interacting with light field. It is found that the geometric phase in a cycle case has nothing to do with the frequency of the photon field, the coupling coefficient between photons and atoms, and the atom transition frequency.
In a ring of s-wave superconducting material the magnetic flux is quantized in units of Φ0=h2eΦ_0 = \frac{h}{2e}Φ0​=2eh​. It is well known from the theory of Josephson junctions that if the ring is interrupted with a piece of d-wave material, then the flux is quantized in one-half of those units due to a additional phase shift of πππ. We reinterpret this phenomenon in terms of geometric phase. We consider an idealized hetero-junction superconductor with pure s-wave and pure d-wave electron pairs. We find, for this idealized configuration, that the phase shift of πππ follows from the discontinuity in the geometric phase and is thus a fundamental consequence of quantum mechanics.