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- Quantum_nondemolition_measurement abstract "Quantum nondemolition (QND) measurement is a special type of measurement of a quantum system in which the uncertainty of the measured observable does not increase from its measured value during the subsequent normal evolution of the system. This necessarily requires that the measurement process preserve the physical integrity of the measured system, and moreover places requirements on the relationship between the measured observable and the self-Hamiltonian of the system. In a sense, QND measurements are the "most classical" and least disturbing type of measurement in quantum mechanics.Most devices capable of detecting a single particle and measuring its position strongly modify the particle's state in the measurement process, e.g. photons are destroyed when striking a screen. Less dramatically, the measurement may simply perturb the particle in an unpredictable way; a second measurement, no matter how quickly after the first, is then not guaranteed to find the particle in the same location. Even for ideal, "first-kind" projective measurements in which the particle is in the measured eigenstate immediately after the measurement, the subsequent free evolution of the particle will cause uncertainty in position to quickly grow.In contrast, a momentum (rather than position) measurement of a free particle can be QND because the momentum distribution is preserved by the particle's self-Hamiltonian p2/2m.Note that the term "nondemolition" does not imply that the wave function fails to collapse.QND measurements are extremely difficult to carry out experimentally. Much of the investigation into QND measurements was motivated by the desire to avoid the standard quantum limit in the experimental detection of gravitational waves. The general theory of QND measurements was laid out by Braginsky, Vorontsov, and Thorne following much theoretical work by Braginsky, Caves, Drever, Hollenhorts, Khalili, Sandberg, Thorne, Unruh, Vorontsov, and Zimmerman.".
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- Quantum_nondemolition_measurement wikiPageWikiLink Category:Quantum_measurement.
- Quantum_nondemolition_measurement wikiPageWikiLink Gravitational_wave.
- Quantum_nondemolition_measurement wikiPageWikiLink Gravitational_waves.
- Quantum_nondemolition_measurement wikiPageWikiLink Measurement_in_quantum_mechanics.
- Quantum_nondemolition_measurement wikiPageWikiLink Observable.
- Quantum_nondemolition_measurement wikiPageWikiLink Projection-valued_measure.
- Quantum_nondemolition_measurement wikiPageWikiLink Quantum_limit.
- Quantum_nondemolition_measurement wikiPageWikiLink Quantum_mechanics.
- Quantum_nondemolition_measurement wikiPageWikiLink Standard_quantum_limit.
- Quantum_nondemolition_measurement wikiPageWikiLink Wave_function.
- Quantum_nondemolition_measurement wikiPageWikiLink Wave_function_collapse.
- Quantum_nondemolition_measurement wikiPageWikiLinkText "Quantum nondemolition measurement".
- Quantum_nondemolition_measurement wikiPageWikiLinkText "quantum nondemolition measurement".
- Quantum_nondemolition_measurement hasPhotoCollection Quantum_nondemolition_measurement.
- Quantum_nondemolition_measurement wikiPageUsesTemplate Template:Reflist.
- Quantum_nondemolition_measurement subject Category:Quantum_measurement.
- Quantum_nondemolition_measurement hypernym Type.
- Quantum_nondemolition_measurement type Mechanic.
- Quantum_nondemolition_measurement comment "Quantum nondemolition (QND) measurement is a special type of measurement of a quantum system in which the uncertainty of the measured observable does not increase from its measured value during the subsequent normal evolution of the system. This necessarily requires that the measurement process preserve the physical integrity of the measured system, and moreover places requirements on the relationship between the measured observable and the self-Hamiltonian of the system.".
- Quantum_nondemolition_measurement label "Quantum nondemolition measurement".
- Quantum_nondemolition_measurement sameAs Quantum_Nondemolition_Measurement.
- Quantum_nondemolition_measurement sameAs m.02xbxfk.
- Quantum_nondemolition_measurement sameAs Q7269077.
- Quantum_nondemolition_measurement sameAs Q7269077.
- Quantum_nondemolition_measurement wasDerivedFrom Quantum_nondemolition_measurement?oldid=678175942.
- Quantum_nondemolition_measurement isPrimaryTopicOf Quantum_nondemolition_measurement.