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首页> 外文期刊>Physical Review X >Evading Quantum Mechanics: Engineering a Classical Subsystem within a Quantum Environment
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Evading Quantum Mechanics: Engineering a Classical Subsystem within a Quantum Environment

机译：逃避量子力学：在量子环境中设计经典子系统

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Quantum mechanics is potentially advantageous for certain information-processing tasks, but its probabilistic nature and requirement of measurement backaction often limit the precision of conventional classical information-processing devices, such as sensors and atomic clocks. Here we show that, by engineering the dynamics of coupled quantum systems, it is possible to construct a subsystem that evades the measurement backaction of quantum mechanics, at all times of interest, and obeys any classical dynamics, linear or nonlinear, that we choose. We call such a system a quantum-mechanics-free subsystem (QMFS). All of the observables of a QMFS are quantum-nondemolition (QND) observables; moreover, they are dynamical QND observables, thus demolishing the widely held belief that QND observables are constants of motion. QMFSs point to a new strategy for designing classical information-processing devices in regimes where quantum noise is detrimental, unifying previous approaches that employ QND observables, backaction evasion, and quantum noise cancellation. Potential applications include gravitational-wave detection, optomechanical-force sensing, atomic magnetometry, and classical computing. Demonstrations of dynamical QMFSs include the generation of broadband squeezed light for use in interferometric gravitational-wave detection, experiments using entangled atomic-spin ensembles, and implementations of the quantum Toffoli gate.
机译：量子力学对于某些信息处理任务可能具有优势，但其概率性质和对测量反作用的要求通常会限制传统经典信息处理设备（例如传感器和原子钟）的精度。在这里，我们表明，通过对耦合量子系统的动力学进行工程设计，有可能构建一个子系统，该子系统在感兴趣的所有时间都逃避量子力学的测量反作用，并且遵循我们选择的任何经典动力学，无论是线性的还是非线性的。我们称这种系统为无量子力学子系统（QMFS）。 QMFS的所有可观察物都是量子非爆破（QND）可观察物。而且，它们是动态的QND可观测量，从而破坏了人们普遍认为的QND可观测量是运动常数。 QMFS指出了一种在量子噪声有害的情况下设计经典信息处理设备的新策略，该策略统一了先前采用QND可观察，后向回避和量子噪声消除的方法。潜在的应用包括重力波检测，光机械力感测，原子磁力计和经典计算。动态QMFS的演示包括用于干涉重力波检测的宽带压缩光的产生，使用原子自旋纠缠缠结的实验以及量子托夫里门的实现。

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