Back action (quantum)

(Quantum) back action refers (in the regime of quantum systems) to the effect of a detector on the measurement itself, as if the detector is not just making the measurement but also affecting the measured or observed system under a perturbing effect.[1][2] Back action has important consequences on the measurement process, and is a significant factor in measurements near the quantum limit, such as measurements approaching the Standard Quantum Limit (SQL).

Back action is an actively sought-after area of interest. There have been experiments in recent times, with nanomechanical systems, where back action was evaded in making measurements.[3]

References
  1. Braginsky, V .B.; Khalili, F. Ya. (1992). Quantum Measurement. Cambridge University Press. ISBN 978-0521484138
  2. Hatridge, M.; Shankar, S.; Mirrahimi, M.; Schackert, F.; Geerlings, K.; Brecht, T.; Sliwa, K. M.; Abdo, B.; Frunzio, L.; Girvin, S. M.; Schoelkopf, R. J.; Devoret, M. H. (10 January 2013). "Quantum Back-Action of an Individual Variable-Strength Measurement". Science. American Association for the Advancement of Science (AAAS). 339 (6116): 178–181. arXiv:1903.11732. doi:10.1126/science.1226897. ISSN 0036-8075.
  3. Hertzberg, J. B.; Rocheleau, T.; Ndukum, T.; Savva, M.; Clerk, A. A.; Schwab, K. C. (6 December 2009). "Back-action-evading measurements of nanomechanical motion". Nature Physics. Springer Science and Business Media LLC. 6 (3): 213–217. arXiv:0906.0967. doi:10.1038/nphys1479. ISSN 1745-2473.


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