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https://doi.org/10.1103/PhysRevX.2.031016
DC Field | Value | |
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dc.title | Evading quantum mechanics: Engineering a classical subsystem within a quantum environment | |
dc.contributor.author | Tsang, M | |
dc.contributor.author | Caves, C.M | |
dc.date.accessioned | 2020-11-10T00:34:57Z | |
dc.date.available | 2020-11-10T00:34:57Z | |
dc.date.issued | 2012 | |
dc.identifier.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 | |
dc.identifier.issn | 21603308 | |
dc.identifier.uri | https://scholarbank.nus.edu.sg/handle/10635/183224 | |
dc.description.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. | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
dc.source | Unpaywall 20201031 | |
dc.subject | Backaction | |
dc.subject | Classical dynamics | |
dc.subject | Gravitational-wave detection | |
dc.subject | Noise cancellation | |
dc.subject | Potential applications | |
dc.subject | Quantum system | |
dc.subject | Toffoli gates | |
dc.subject | Dynamics | |
dc.subject | Quantum electronics | |
dc.subject | Quantum noise | |
dc.subject | Quantum optics | |
dc.subject | Quantum entanglement | |
dc.type | Article | |
dc.contributor.department | ELECTRICAL AND COMPUTER ENGINEERING | |
dc.description.doi | 10.1103/PhysRevX.2.031016 | |
dc.description.sourcetitle | Physical Review X | |
dc.description.volume | 2 | |
dc.description.issue | 3 | |
dc.description.page | 31016 | |
Appears in Collections: | Staff Publications Elements |
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