2014
DOI: 10.1103/physrevb.90.075312
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Projective versus weak measurement of charge in a mesoscopic conductor

Abstract: We study the charge dynamics of a quantum dot as measured by a nearby quantum point contact probing the dot via individual single-particle wave packets. We contrast the two limiting cases of weak and strong system--detector coupling exerting vanishing and strong back-action on the system and analyze the resulting differences in the charge-charge correlator. Extending the study to multiple projective measurements modelling a continuous strong measurement, we identify a transition from a charge dynamics dominate… Show more

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Cited by 8 publications
(14 citation statements)
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References 45 publications
(120 reference statements)
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“…Discussions on quantum measurement in electronic transport systems involve both the von Neumann projecton postulate and detector's backaction on the system 52,53 . In Refs.…”
Section: Introductionmentioning
confidence: 99%
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“…Discussions on quantum measurement in electronic transport systems involve both the von Neumann projecton postulate and detector's backaction on the system 52,53 . In Refs.…”
Section: Introductionmentioning
confidence: 99%
“…In Refs. [52] and [53], the quantum point contact (QPC) detector is capacitively coupled to the central scattering region and the current through QPC detector serves as a readout for the charge in the scattering region. When the coupling strength t c between the detector and scattering region is larger than hΓ which is related to the QPC tunneling time scale 1/Γ, strong backaction of the detector on the system leads to the strong projective measurement.…”
Section: Introductionmentioning
confidence: 99%
“…2 and Ref. 13 for a recent discussion of this system. Here, we want to characterize the dot's dynamics by its two-time charge correlator.…”
Section: Charge Correlator Measurementmentioning
confidence: 99%
“…The measurement with a weakly coupled detector can be treated perturbatively, with the von Neumann projection excerted on the detector and no back action on the system 1 . In a strong measurement with a large system-detector coupling, the projection formally can be applied directly to the system, therefore producing a maximal back action 13 .…”
Section: Introductionmentioning
confidence: 99%
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