High sensitivity charge detection and dephasing in edge state interferometer

We present an interferometry model of high sensitivity and high efficiency charge detectors in the integer quantum Hall regime. We show that the charge sensitivity in Fabry–Perot interferometer is higher than a Mach–Zehnder interferometer due to multiple reflections of electrons at quantum point con...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2010-02, Vol.42 (4), p.1103-1106
Main Authors: Pathak, P.K., Lee, Youngnae, Kang, Kicheon
Format: Article
Language:English
Subjects:
Ballistic transport
Coherence
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Edge states
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in interface structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Physics
Quantum dots
Quantum hall effect (including fractional)
Quantum measurement
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Summary:We present an interferometry model of high sensitivity and high efficiency charge detectors in the integer quantum Hall regime. We show that the charge sensitivity in Fabry–Perot interferometer is higher than a Mach–Zehnder interferometer due to multiple reflections of electrons at quantum point contacts. We report the possibility of tuning Fabry–Perot interferometer for quantum limited detection for two quantum point contacts having different reflection probabilities. For systems with one quantum point contact and with two point contacts, we discuss improvement in sensitivity using electrons in spin entangled singlet pairs, injected through identically biased input terminals.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2009.11.139