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03 November 2024
 
  » arxiv » 0710.0211

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Nonlocality of Dephasing in a Charge Qubit Interacting with a Quantum Point Contact Beam Collider
Youngnae Lee ; Gyong Luck Khym ; Kicheon Kang ;
Date 1 Oct 2007
AbstractWe investigate the charge-detection-induced dephasing of a charge qubit interacting with an electronic beam collider composed of a quantum point contact. We report that, while the qubit is dephased by the partitioned beam of uncorrelated electrons, the interference of the qubit is fully restored when the two inputs are identically biased so that all the electrons suffer two-electron collision. This phenomenon is related to Fermi statistics and illustrates the peculiar nonlocality of dephasing. We also describe detection properties for the injection of entangled electron pairs.
Source arXiv, 0710.0211
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