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Noninvasive measurement of dynamic correlation functions

dc.contributor.authorUhrich, Philippen_ZA
dc.contributor.authorCastrignano, Salvatoreen_ZA
dc.contributor.authorUys, Hermannen_ZA
dc.contributor.authorKastner, Michaelen_ZA
dc.date.accessioned2019-02-20T13:55:40Z
dc.date.available2019-02-20T13:55:40Z
dc.date.issued2017
dc.identifier.citationUhrich, P., et al. 2017. Noninvasive measurement of dynamic correlation functions. Physical Review A, 96(2):022127, doi:10.1103/PhysRevA.96.022127en_ZA
dc.identifier.issn2469-9934 (online)
dc.identifier.issn2469-9926 (print)
dc.identifier.otherdoi:10.1103/PhysRevA.96.022127
dc.identifier.urihttp://hdl.handle.net/10019.1/105448
dc.descriptionCITATION: Uhrich, P., et al. 2017. Noninvasive measurement of dynamic correlation functions. Physical Review A, 96(2):022127, doi:10.1103/PhysRevA.96.022127.en_ZA
dc.descriptionThe original publication is available at http://journals.aps.org/praen_ZA
dc.description.abstractThe measurement of dynamic correlation functions of quantum systems is complicated by measurement backaction. To facilitate such measurements we introduce a protocol, based on weak ancilla-system couplings, that is applicable to arbitrary (pseudo)spin systems and arbitrary equilibrium or nonequilibrium initial states. Different choices of the coupling operator give access to the real and imaginary parts of the dynamic correlation function. This protocol reduces disturbances due to the early-time measurements to a minimum, and we quantify the deviation of the measured correlation functions from the theoretical, unitarily evolved ones. Implementations of the protocol in trapped ions and other experimental platforms are discussed. For spin-1/2 models and single-site observables we prove that measurement backaction can be avoided altogether, allowing for the use of ancilla-free protocols.en_ZA
dc.description.urihttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.96.022127
dc.format.extent14 pages : illustrations (some colour)en_ZA
dc.language.isoen_ZAen_ZA
dc.publisherAmerican Physical Societyen_ZA
dc.subjectMeasurementen_ZA
dc.subjectQuantum systemsen_ZA
dc.subjectCorrelation functionsen_ZA
dc.subjectHamiltonian mechanicsen_ZA
dc.titleNoninvasive measurement of dynamic correlation functionsen_ZA
dc.typeArticleen_ZA
dc.description.versionPublisher's versionen_ZA
dc.rights.holderAmerican Physical Societyen_ZA


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