引力波的量子模拟

Quantum Emulation of Molecular Force Fields: A Blueprint for a Superconducting Architecture

In this work, we propose a flexible architecture of microwave resonators with tunable couplings to perform quantum simulations of problems from the field of molecular chemistry. The architecture builds on the experience of the D-Wave design, working with nearly harmonic circuits instead of qubits. This architecture, or modifications of it, can be used to emulate molecular processes such as vibronic transitions. Furthermore, we discuss several aspects of these emulations, such as dynamical ranges of the physical parameters, quenching times necessary for diabaticity, and, finally, the possibilit…

椭圆直写波导阵列中的双光子量子行走

Two-photon quantum walks in an elliptical direct-write waveguide array

集成光学为通过连续时间量子行走仿真量子系统提供了理想的测试平台。本文研究了椭圆波导阵列中双光子态的演化。我们通过相干光层析成像的光子芯片，并使用结果来预测时间上不可区分和可区分的双光子输入，然后我们与实验观察比较之间的明显差异。我们的工作突出了在三维波导结构中模拟相干量子现象的可行性。

Quantum emulation of coherent backscattering in a system of superconducting qubits

In condensed matter systems, coherent backscattering and quantum interference in the presence of time-reversal symmetry lead to well-known phenomena such as weak localization (WL) and universal conductance fluctuations (UCF). Here we use multi-pass Landau-Zener transitions at the avoided crossing of a highly-coherent superconducting qubit to emulate these phenomena. The average and standard deviation of the qubit transition rate exhibit a dip and peak when the driving waveform is time-reversal symmetric, analogous to WL and UCF, respectively. The higher coherence of this qubit enabled the real…

Molecular Excited State Calculations with Adaptive Wavefunctions on a Quantum Eigensolver Emulation: Reducing Circuit Depth and Separating Spin States

Ab initio electronic excited state calculations are necessary for the quantitative study of photochemical reactions, but their accurate computation on classical computers is plagued by prohibitive scaling. The Variational Quantum Deflation (VQD) is an extension of the Variational Quantum Eigensolver (VQE) for calculating electronic excited state energies, and has the potential to address some of these scaling challenges using quantum computers. However, quantum computers available in the near term can only support a limited number of circuit operations, so reducing the quantum computational co…

使用矩阵乘积态快速模拟费米子线路

Fast emulation of fermionic circuits with matrix product states

本文提出FQE软件库的矩阵乘积态扩展MPS-FQE，基于对称化适应MPS近似费米子波函数，作为FQE直接替代品实现更高效的大规模费米子线路近似模拟，并展示了在量子相位估计、VQE、Trotter误差评估及量子动力学等应用中处理比全态矢量模拟器更大系统的能力。

量子统计驱动拓扑相变的电路仿真

Electric circuit emulation of topological transitions driven by quantum statistics

本研究预测双粒子相互作用系统中量子统计可驱动拓扑相变，以含任意子的扩展一维Hubbard模型验证该机制，并提出用谐振电路仿真该系统的严谨方法。