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Advances in Condensed Matter Physics

Geometric Phase in a Quantum Coherent Tunable Coupling of Superconducting Qubits

元新 乔

Published Jan 1, 2018• 0 citations
Publisher

Abstract

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.

DOI
10.12677/cmp.2018.71004

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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.
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.
量子计算是一种遵循量子力学规律调控量子信息单元进行计算的新型计算模式。本文利用电流偏置信息总线的Josephson量子位，计算了几何相位。发现该几何相位与大电流约瑟夫逊结、量子振荡器频率、对称约瑟夫逊能量耦合器的偏置电流无关，与施加到第k个量子位的栅极电容、磁通量子、外部电流和栅极电压无关。本文结果对利用约瑟夫森量子比特计算具有一定的理论意义。 Quantum computation is a new computational model which follows the rules of quantum mechanics to control the quantum information unit. This paper calculates the geometric phase by using the Josephson qubits of current-biased information bus. The geometric phase has nothing to do with the bias current of the large current-biased Josephson junction, the quantum oscillator frequency, the coupler with symmetric Josephson energies, and also the gate capacitance, flux quantum, external flux, and gate voltage applied to the kth qubit. The results of this paper have a certain theoretical significance to the calculation of the quantum bit of Josephson.
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.
Nonadiabatic geometric phases have important applications in quantum computation, as they depend only on the global properties of the evolution paths, and thus are robust against certain types of local noise. Experimental implementation is challenging, though, due to the need for complex control of multilevel or multiple quantum systems. This study proposes a delicate gate implementation to solve the problem, based on parametrically tunable resonant coupling between two superconducting transmon qubits, without introducing any auxiliary state. This approach is promising for high-fidelity geometric manipulation and robust solid-state quantum computing.