Effects of Entanglement in Controlled Dephasing
Silva, Alessandro · Levit, Shimon
Original · EN
In controlled dephasing as a result of the interaction of a controlled environment (dephasor) and the system under observation (dephasee) the states of the two subsystems are entangled. Using as an example the ``Which Path Detector'', we discuss how the entanglement influences the controlled dephasing. In particular, we calculate the suppression ν of A-B oscillations as a function of the bias eV applied to the QPC and the coupling Γ of the QD to the leads. At low temperatures the entanglement produces a smooth crossover from ν∝ (eV/Γ)², when eV ≪ Γ to ν∝ eV/Γ, for eV ≫ Γ.
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