VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Tuesday 6
Dots and wires

› 18:00 - 18:30 (30min)
Weak Measurement in Solid State Systems
Yuval Gefen  1@  
1 : Weizmann Institute of Science  (WIS)  -  Website
234 Herzl Street, Rehovot 76100 Israel -  Israel

Weak Measurement in Solid State Systems

Yuval Gefen

Department of Condensed Matter Physics

Weizmann Institute , Rehovot, 76100 Israel

The process of measurement in quantum mechanics, as was formulated by J. von Neumann at the dawn of QM, involves a “strong measurement”, which gives rise to the collapse of the wave function of the system measured. In 1988 Aharonov et al. have defined another measurement scheme which they termed Weak Value (WV). This is a two-step protocol consisting of a weak measurement (that does not collapse the wave function involved), followed by a strong measurement. We will discuss the surprising and non-intuitive outcomes of such measurement protocols, how one can harness WV to measure observables which are not easily accessible in conventional strong measurement, and how to apply all this to the arena of solid state physics. Examples of how to apply WV protocols to gain amplification of weak signals, for quantum state discrimination, and for the non-destructive observation of a virtual state (direct measurement of cotunneling) , will be discussed. 


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