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Macroscopic quantum state

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A macroscopic quantum state is a state of matter in which macroscopic properties, such as mechanical motion, thermal conductivity, electrical conductivity and viscosity, can be described only by quantum mechanics rather than merely classical mechanics. This occurs primarily at low temperatures where little thermal motion is present to mask the quantum nature of a substance.

Macroscopic quantum phenomena can emerge from coherent states of superfluids and superconductors. Quantum states of motion have been directly observed in a macroscopic mechanical resonator (see quantum machine).

References

  1. O'Connell, A. D.; Hofheinz, M.; Ansmann, M.; Bialczak, Radoslaw C.; Lenander, M.; Lucero, Erik; Neeley, M.; Sank, D.; Wang, H.; Weides, M.; Wenner, J.; Martinis, John M.; Cleland, A. N. (2010). "Quantum ground state and single-phonon control of a mechanical resonator". Nature. 464 (7289): 697–703. Bibcode:2010Natur.464..697O. doi:10.1038/nature08967. ISSN 0028-0836. PMID 20237473. S2CID 4412475.
  2. Ansmann, Markus; Wang, H.; Bialczak, Radoslaw C.; Hofheinz, Max; Lucero, Erik; Neeley, M.; O'Connell, A. D.; Sank, D.; Weides, M.; Wenner, J.; Cleland, A. N.; Martinis, John M. (2009). "Violation of Bell's inequality in Josephson phase qubits". Nature. 461 (7263): 504–506. Bibcode:2009Natur.461..504A. doi:10.1038/nature08363. ISSN 0028-0836. PMID 19779447. S2CID 4401494.
  3. Jaeger, Gregg (September 2014). "What in the (quantum) world is macroscopic?". American Journal of Physics. 82 (9): 896–905. Bibcode:2014AmJPh..82..896J. doi:10.1119/1.4878358.
  4. Jaeger, Gregg (September 2014). "What in the (quantum) world is macroscopic?". American Journal of Physics. 82 (9): 896–905. Bibcode:2014AmJPh..82..896J. doi:10.1119/1.4878358.


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  1. "Synonyms and Antonyms for MACROSCOPICALLY". OpenSynonym. Retrieved 2021-05-14.
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