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arXiv 2501.18697quant-ph
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面向非酉量子演化高效精确模拟的酉扩展策略

Unitary Dilation Strategy Towards Efficient and Exact Simulation of Non-Unitary Quantum Evolutions

Aman Mehta, Scott E. Smart, Joseph Peetz, David A. Mazziotti, Prineha Narang

AI总结:

针对非酉量子操作模拟成本高的问题,提出基于Lagrange-Sylvester插值的单辅助量子比特酉分解技术,实现任意非酉算子无近似误差的精确表示,大幅降低测量成本。

摘要:

模拟与环境相互作用的量子系统通常需要非酉操作,将其映射到量子设备上往往涉及昂贵的扩展或极高的测量成本才能达到所需精度。基于先前有限差分策略的研究,我们引入了一种高效且精确的单辅助量子比特酉分解技术来解决这些挑战。该方法基于Lagrange-Sylvester插值,类似于函数插值的解析微分技术。因此,我们能通过易计算的分解,精确表示任意非酉算子且无有限近似误差。这可使测量成本降低数个数量级,对开放系统的实用量子计算极具吸引力。

英文摘要:

Simulating quantum systems with their environments often requires non-unitary operations, and mapping these to quantum devices often involves expensive dilations or prohibitive measurement costs to achieve desired precisions. Building on prior work with a finite-differences strategy, we introduce an efficient and exact single-ancilla unitary decomposition technique that addresses these challenges. Our approach is based on Lagrange-Sylvester interpolation, akin to analytical differentiation techniques for functional interpolation. As a result, we can exactly express any arbitrary non-unitary operator with no finite approximation error using an easily computable decomposition. This can lead to several orders of magnitude reduction in the measurement cost, which is highly desirable for practical quantum computations of open systems.

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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