Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-03
Phys. Rev. Lett. 102, 236802 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
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.
Cavanna Andrea
Faini Giancarlo
Gennser Ulf
Mailly Dominique
Portier Fabien
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