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arXiv 1902.07155quant-phcond-mat.quant-gascond-mat.stat-mech
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在量子模拟器中测量伊辛模型的复配分函数零点

Measuring complex partition function zeroes of Ising models in quantum simulators

Abijith Krishnan, Markus Schmitt, Roderich Moessner, Markus Heyl

摘要:

研究复杂控制参数空间中配分函数的零点,可以正式理解多体系统的临界行为如何在热力学极限下出现,尽管有限系统存在各种不可行定理。在这项工作中,我们提出了协议,可以实现在量子模拟器来测量复杂的配分函数零的经典伊辛模型的位置。该协议完全基于简单的两个量子比特门,本地自旋旋转和沿两个正交量化轴的投影测量的实现。除了提出一个典型的经典模型的测量结果的数值模拟,我们讨论了投影噪声的影响和最先进的量子模拟平台上的实施的可行性。

英文摘要:

Studying the zeroes of partition functions in the space of complex control parameters allows to understand formally how critical behavior of a many-body system can arise in the thermodynamic limit despite various no-go theorems for finite systems. In this work we propose protocols that can be realized in quantum simulators to measure the location of complex partition function zeroes of classical Ising models. The protocols are solely based on the implementation of simple two-qubit gates, local spin rotations, and projective measurements along two orthogonal quantization axes. Besides presenting numerical simulations of the measurement outcomes for an exemplary classical model, we discuss the effect of projection noise and the feasibility of the implementation on state of the art platforms for quantum simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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