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We consider the phase-coherent transport of electrons passing through anAharonov-Bohm ring while interacting with a tunnel charge in a double quantumdot (representing a charge qubit) which couples symmetrically to both arms ofthe ring. For Aharonov-Bohm flux Phi_AB=h/2e we find that electrons can only betransmitted when they flip the charge qubit's pseudospin parity an odd numberof times. The perfect correlations of the dynamics of the pseudospin andindividual electronic transmission and reflection events can be used toentangle the charge qubit with an individual passing electron.Comment: 6 pages, 5 figure

Entanglement between static and flying qubits in an Aharonov–Bohm double electrometer