Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: TR: Nanoelectronics I: Quantum Dots, Wires, Point Contacts 2
TT 33.10: Vortrag
Donnerstag, 25. März 2010, 16:30–16:45, H19
Two-Particle Nonlocal Aharonov-Bohm Effect from Two Single-Particle Emitters — •Janine Splettstoesser1,3, Michael Moskalets2, and Markus Buttiker3 — 1Institut für Theoretische Physik A, RWTH Aachen University, D-52074 Aachen — 2Department of Metal and Semic. Physics, NTU Kharkiv Polytechnic Institute, 61002 Kharkiv, Ukraine — 3Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland
High-frequency single-particle emitters have been realized experimentally in the integer quantum Hall effect regime [1]. These tools allow for the implementation of complex interferometers in mesoscopic systems showing two-particle interference effects. In the work presented here we explore the entanglement production from two uncorrelated sources. We therefore propose a mesoscopic circuit in the quantum Hall effect regime comprising two independent single-particle sources and two distant Mach-Zehnder interferometers with magnetic fluxes. This and the tunability of the single-particle sources allow in a controllable way to produce orbitally entangled electrons [2]. Two-particle correlations appear as a consequence of erasing of which-path information due to collisions taking place at distant interferometers and in general at different times. The two-particle correlations manifest themselves as an Aharonov-Bohm effect in the noise. In an appropriate time-interval the concurrence reaches a maximum, proving the existence of time-bin entanglement.
[1] G. Fève, et al., Science 316, 1169 (2007).
[2] J. Splettstoesser, M. Moskalets, and M. Buttiker, Phys. Rev. Lett. 103, 076804 (2009).