arXiv:2608.11396quant-phcs.LG2026-08

用生成模型设计量子测量,兼顾效率与硬件限制。

Generative Learning for Quantum Measurement Design

论文配图:Generative Learning for Quantum Measurement Design
图 1 · 摘自论文原文
  • 用生成流网络直接采样满足资源约束的浅层测量电路。
  • 零纠缠深度下性能优于主流产品测量法,误差降低最高达27%。
  • 可跨分子复用,加速势能面计算,适用于20~54量子比特系统。

从量子态中提取信息是量子计算的基础任务,常需在有限测量预算下估计多个非对易可观测量。在近中期及早期容错设置中,测量协议需平衡统计效率与电路深度、连通性、纠缠门数量等实现资源。现有策略多集中于两个极端:硬件友好但采样成本高的产品测量,以及电路深但完全对易的测量。本文将资源受限的测量设计重构为生成学习问题,提出FlowMeas,通过生成流网络直接采样满足指定总测量次数和硬件约束的浅层Clifford测量电路。在零纠缠深度下,其学习到的逐比特对易测量方案已匹配或超越多数分子基准上的先进产品测量方法。允许一层或两层纠缠门时,能量估计误差相对最强的无状态依赖产品测量基线最多降低27%。所学策略可跨相关哈密顿量复用,显著加速分子势能面上的再训练。该框架还扩展至20量子比特分子哈密顿量,并应用于紧凑编码的54量子比特相互作用费米子模型,突破了以往分子基准的规模限制。这些结果确立了生成学习作为实际资源约束下量子测量设计的灵活统一框架。

原文摘要 · Abstract (English)

Extracting quantum information from a quantum state is a fundamental task of quantum computation, often requiring the estimation of many non-commuting observables under a finite measurement budget. For both near-term and early fault-tolerant settings, the measurement protocol must balance statistical efficiency against implementation resources such as circuit depth, connectivity, and entangling-gate count. Many existing strategies focus on two extremes: hardware-friendly product measurements with high sampling cost, and fully commuting measurements with deep circuits. Here we recast resource-constrained measurement design as a generative learning problem. We introduce FlowMeas, which uses a generative flow network to directly sample finite ensembles of shallow Clifford measurement circuits subject to a prescribed shot budget and hardware constraints. At zero entangling depth, FlowMeas learns qubit-wise commuting measurement schedules and already matches or improves leading product-measurement methods on nearly all molecular benchmarks. Allowing one or two entangling gate layers yields further reductions in energy estimation error of up to $27\%$ relative to the strongest state-independent product-measurement baseline. The learned policy can also be reused across related Hamiltonians, substantially accelerating retraining along a molecular potential-energy surface. We further obtain results for molecular Hamiltonians with up to 20 qubits and apply the framework to a compactly encoded 54-qubit interacting fermionic model, extending the demonstrated scale beyond prior molecular benchmarks. These results establish generative learning as a flexible and unified framework for quantum measurement design under practical resource constraints.

量子测量生成模型量子计算优化设计

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