Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 13: Transport - Quantum Coherence and Quantum Information Systems

TT 13.2: Talk

Saturday, March 5, 2005, 09:00–09:15, TU H3027

Fermionic Mach-Zehnder interferometer subject to a Quantum Bath — •Florian Marquardt — Department of Physics, Yale University, New Haven, USA

The Mach-Zehnder interferometer represents the simplest possible two-way interference setup, and its recent experimental realization in an electronic system [1] has raised many intriguing questions. The loss of interference contrast with rising voltage or temperature and the shot noise of the output current have been measured. In this talk I will present a theoretical analysis of decoherence in a fermionic Mach-Zehnder interferometer coupled to any quantum mechanical environment [2]. I will discuss the energy-resolved dephasing rate, the connections to the theory of dephasing in weak localization, the importance of Pauli blocking, and the shot noise correction due to the environment. The results will be compared with simpler models of dephasing, including classical noise sources [3].

[1] Y. Ji et al., Nature 422, 415 (2003)

[2] F. Marquardt, cond-mat/0410333 (2004)

[3] F. Marquardt and C. Bruder, Phys. Rev. Lett. 92, 056805 (2004)