Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Quantum Coherence and Quantum Information Systems 3 (jointly with MA and HL)

TT 20.5: Invited Talk

Tuesday, March 27, 2012, 11:00–11:30, BH 243

Distinguishing quantum and classical transport through nanostructures — •Clive Emary¹, Neill Lambert², Franco Nori^2,3, and Yueh-Nan Chen⁴ — ¹TU Berlin, Germany — ²RIKEN, Japan — ³University of Michigan, USA — ⁴National Cheng-Kung University, Tainan, Taiwan

I will discuss the question of how to distinguish quantum from classical transport through nanostructures using fundamental quantum-mechanical inequalities. I will briefly discuss how Bell's inequalities can be employed to investigate entanglement in the solid-state, before focusing on a less well-known inequality, the Leggett-Garg inequality. This latter probes the `macroscopic realism' of a system, i.e. whether or not the system has a well-defined state independent of the observer. I will describe how the Leggett-Garg inequality can be realised in transport context, and how it can be violated by quantum coherent transport.