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https://doi.org/10.1103/PhysRevX.2.031016
Title: | Evading quantum mechanics: Engineering a classical subsystem within a quantum environment | Authors: | Tsang, M Caves, C.M |
Keywords: | Backaction Classical dynamics Gravitational-wave detection Noise cancellation Potential applications Quantum system Toffoli gates Dynamics Quantum electronics Quantum noise Quantum optics Quantum entanglement |
Issue Date: | 2012 | Citation: | Tsang, M, Caves, C.M (2012). Evading quantum mechanics: Engineering a classical subsystem within a quantum environment. Physical Review X 2 (3) : 31016. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevX.2.031016 | Rights: | Attribution 4.0 International | Abstract: | 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-w]ave 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. | Source Title: | Physical Review X | URI: | https://scholarbank.nus.edu.sg/handle/10635/183224 | ISSN: | 21603308 | DOI: | 10.1103/PhysRevX.2.031016 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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