Tuning decoherence with a voltage probe

Abstract

We present an experiment where we tune the decoherence in a quantum interferometer using one of the simplest object available in the physic of quantum conductors : an ohmic contact. For that purpose, we designed an electronic Mach-Zehnder interferometer which has one of its two arms connected to an ohmic contact through a quantum point contact. At low temperature, we observe quantum interference patterns with a visibility up to 57%. Increasing the connection between one arm of the interferometer to the floating ohmic contact, the voltage probe, reduces quantum interferences as it probes the electron trajectory. This unique experimental realization of a voltage probe works as a trivial which-path detector whose efficiency can be simply tuned by a gate voltage.

References in corpus (7)

• Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
• Finite bias visibility of the electronic Mach-Zehnder interferometer
• Noise dephasing in the edge states of the Integer Quantum Hall regime
• Voltage and dephasing probes: a full counting statistics discussion
• Influence of dephasing on shot noise in an electronic Mach-Zehnder interferometer
• Effects of dephasing on shot-noise in an electronic Mach-Zehnder interferometer
• Current-voltage correlations in interferometers

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