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Measurement of the transmission phase through a quantum dot (QD) embedded inan arm of a two-terminal Aharonov-Bohm (AB) interferometer is inhibited byphase symmetry, i.e. the property that the linear response conductance of atwo-terminal device is an even function of magnetic field. It is demonstratedthat in a setup consisting of an interferometer with a QD in each of its arms,with one of the QDs capacitively coupled to a nearby quantum point contact(QPC), phase symmetry is broken when a finite voltage bias is applied to theQPC. The transmission phase via the uncoupled QD can then be deduced from theamplitude of the odd component of the AB oscillations.

How to Measure the Transmission Phase via a Quantum Dot in a Two-Terminal Interferometer