Abstract
We investigate properties of charge detection and detection-induced dephasing of a chargequbit interacting with an electron beam collider composed of a quantum point contact. Wepredict that the interference of the qubit is fully restored when the two inputs areidentically biased so that all the electrons suffer two-electron collision, unlikethe case without collision. This phenomenon is related to Fermi statistics andillustrates the peculiar nonlocality of dephasing. We also describe the detectionproperties of entangled electron pairs. For singlet pairs, the sensitivity of chargedetection is enhanced which originates from the bunching behavior of electrons. Thisdemonstrates that control of exchange statistics of particles can help sensitive chargedetection.
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