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We study the detection of electrons undergoing coherent transfer viaadiabatic passage (CTAP) in a triple quantum-dot system with a quantumpoint-contact sensing the change of the middle dot. In the ideal scenario, theprotocol amounts to perfect change transfer between the external dots withvanishing occupation of the central dot at all times, rendering the measurementand its backaction moot. Nevertheless, even with minor corrections to theprotocol, a small population builds up in the central dot. We study themeasurement backaction by a Bayesian formalism simulation of an instantaneousdetection at the time of maximal occupancy of the dot. We show that theinterplay between the measurement backaction and the non-adiabatic dynamicsinduce a change of the success probability of the protocol, whichquantitatively agrees with a continuous detection treatment. We introduce acorrelated measurement signal to certify the non-occupancy of the central dotfor a successful CTAP protocol, which, in the weak measurement limit, confirmsa vanishing occupation of the central dot. Our proposed correlated-signalpurports that proper experimental method by which to confirm CTAP.

Sensing electrons during an adiabatic coherent transport passage