arXiv:2510.03900cond-mat.stat-mechcs.LG2025-10被引 1

用涨落响应与机器学习设计低能耗计算协议。

Optimal Computation from Fluctuation Responses

  • 基于涨落响应导出梯度,统一优化系统演化路径与概率分布。
  • 在比特擦除和位翻转任务中达到理论最低功耗或接近最优边界。
  • 适用于噪声环境下的量子门及生物网络等物理信息系统的能效控制。

计算的能耗已成为物理学与计算机科学交叉领域的核心挑战。近年来,统计物理(尤其是随机热力学)的发展使得对远离平衡态、受时变控制协议驱动的信息处理系统中的功、热和熵产生能够进行精确刻画。一个关键未解问题是:如何设计最小化热力学成本的同时保证正确结果的控制协议。为此,我们提出一种统一框架,利用涨落响应关系(FRR)与机器学习识别最优协议。与以往分别优化分布或协议的方法不同,本方法通过FRR导出的梯度联合优化两者。此外,该方法主要依赖从采样噪声轨迹中迭代学习,通常比直接求解控制方程更易实现。我们将框架应用于典型场景——双阱势中的比特擦除与谐振阱的平移,展示了如何构建权衡能耗与任务误差的损失函数。框架可直接扩展至欠阻尼系统,并在欠阻尼比特翻转任务中验证其有效性。在所有测试计算中,该方法均达到理论最优协议或接近已知有限时间下的最优功耗界限。结果为物理信息处理系统中设计热力学高效协议提供了系统性策略,应用涵盖抗噪声量子门、化学与合成生物网络的能效控制。

原文摘要 · Abstract (English)

The energy cost of computation has emerged as a central challenge at the intersection of physics and computer science. Recent advances in statistical physics -- particularly in stochastic thermodynamics -- enable precise characterizations of work, heat, and entropy production in information-processing systems driven far from equilibrium by time-dependent control protocols. A key open question is then how to design protocols that minimize thermodynamic cost while ensur- ing correct outcomes. To this end, we develop a unified framework to identify optimal protocols using fluctuation response relations (FRR) and machine learning. Unlike previous approaches that optimize either distributions or protocols separately, our method unifies both using FRR-derived gradients. Moreover, our method is based primarily on iteratively learning from sampled noisy trajectories, which is generally much easier than solving for the optimal protocol directly from a set of governing equations. We apply the framework to canonical examples -- bit erasure in a double-well potential and translating harmonic traps -- demonstrating how to construct loss functions that trade-off energy cost against task error. The framework extends trivially to underdamped systems, and we show this by optimizing a bit-flip in an underdamped system. In all computations we test, the framework achieves the theoretically optimal protocol or achieves work costs comparable to relevant finite time bounds. In short, the results provide principled strategies for designing thermodynamically efficient protocols in physical information-processing systems. Applications range from quantum gates robust under noise to energy-efficient control of chemical and synthetic biological networks.

热力学计算机器学习涨落响应能效优化

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