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Foundations of Quantum Mechanics in the Light of New Technology

OBSERVATION-DEPENDENT DECOHERENCE IN AN AHARONOV-BOHM RING

Keita Kobayashi, H. AIKAWA, Shingo Katsumoto, Y. Iye

Published Oct 1, 2002• 0 citations
Publisher
DOI
10.1142/9789812776716_0049

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We consider the phase-coherent transport of electrons passing through an Aharonov–Bohm ring while interacting with a tunnel charge in a double quantum dot (representing a charge qubit) which couples symmetrically to both arms of the ring. For Aharonov–Bohm flux Φ AB = h /2 e we find that electrons can only be transmitted when they flip the charge qubit's pseudospin parity an odd number of times. The perfect correlations of the dynamics of the pseudospin and individual electronic transmission and reflection events can be used to entangle the charge qubit with an individual passing electron.