Środowiskowe Seminarium z Informacji i Technologii Kwantowych
sala 1.03, ul. Pasteura 5
2021-10-14 (11:15) 
Marcin Jarzyna (Centre for Quantum Optical Technologies UW)
Quantum limits to polarization measurement of classical light
The Seminar will take a HYBRID form. It will take place in room 1.03 but will be simmultaneously tranmitted via ZOOM under the following link: https://zoom.us/j/92894130767 (Passcode: R6Vx6E)
Abstract: In this talk I will discuss the quantum limit to a polarization measurement of a classical coherent light. This is a multiparameter estimation problem with a crucial feature of noncommuting optimal observables corresponding to each parameter which prohibits them to be measured simultaneously. I explicitly minimize the quantum Holevo-Cramer-Rao bound which tackles this issue and show that it can be saturated by conventional receivers for certain parameters values. Finally, I will discuss the issue of global phase reference and how its presence changes the precision of polarization measurement.
Abstract: In this talk I will discuss the quantum limit to a polarization measurement of a classical coherent light. This is a multiparameter estimation problem with a crucial feature of noncommuting optimal observables corresponding to each parameter which prohibits them to be measured simultaneously. I explicitly minimize the quantum Holevo-Cramer-Rao bound which tackles this issue and show that it can be saturated by conventional receivers for certain parameters values. Finally, I will discuss the issue of global phase reference and how its presence changes the precision of polarization measurement.