Experimental Test of Error-Disturbance Uncertainty Relations in Photon Polarization Measurement Keiichi Edamatsu

Date: 
Thursday, October 3, 2013 -
11:00am to 12:00pm
Speaker: 
Keiichi Edamatsu
Speaker's Institution: 
Research Institute of Electrical Communication, Tohoku University

We experimentally test the error-disturbance uncertainty relations exploiting a generalized measurement for a single-photon polarization quit. The test is carried out by linear optical devices that realizes variable measurement strength from a weak measurement to a projection measurement. Two exploited methods, the three-state method and the weak measurement method, consistently show that Heisenberg's relation is violated throughout the range of our measurement strength and yet validates Ozawa's and Branciard's relation. A correct understanding and experimental confirmation of the error-disturbance uncertainty relation will not only foster a insight into fundamental limitations of measurements but also advance the precision measurement technology in quantum information processing.