Exchange statistics, charge detection and back-action dephasing by a mesoscopic beam collider

We investigate properties of charge detection and detection-induced dephasing of a charge qubit interacting with an electron beam collider composed of a quantum point contact. We predict that the interference of the qubit is fully restored when the two inputs are identically biased so that all the e...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2008-10, Vol.20 (39), p.395212-395212 (5)
Main Authors: Lee, Youngnae, Khym, Gyong Luck, Kang, Kicheon
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in mesoscopic systems
Exact sciences and technology
Physics
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Summary:We investigate properties of charge detection and detection-induced dephasing of a charge qubit interacting with an electron beam collider composed of a quantum point contact. We predict that the interference of the qubit is fully restored when the two inputs are identically biased so that all the electrons suffer two-electron collision, unlike the case without collision. This phenomenon is related to Fermi statistics and illustrates the peculiar nonlocality of dephasing. We also describe the detection properties of entangled electron pairs. For singlet pairs, the sensitivity of charge detection is enhanced which originates from the bunching behavior of electrons. This demonstrates that control of exchange statistics of particles can help sensitive charge detection.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/20/39/395212