Matteo Gregoratti, Workshop on: QUANTUM INFORMATION PROCESSING FOR QUANTUM COMMUNICATIONS

Workshop on QUANTUM MEASUREMENTS AND OPERATIONS FOR CRIPTOGRAPHY AND INFORMATION PROCESSING
Quantum Measurements and Operations for Criptography and Information Processing On quantum error-correction by classical feedback in discrete time
aula dottorato - LUNEDì 25 OTTOBRE ore 15.00
	MATTEO GREGORATTI , Politecnico di Milano
>VITAE: Matteo Gregoratti obtained his PhD in 2001 from the University of Milano and sice then he has been working at the Politecnico di Milano, with the exception of two semesters spent at TU Braunschweig. His main fields of interest include quantum stocastic calculus, continuous measurements and applications to quantum information theory.
Abstract
	We consider the problem of correcting the errors incurred from sending quantum information through a noisy quantum environment by using classical information obtained from a measurement on the environment. For discrete time Markovian evolutions, in the case of given measurement on the environment, we give criteria for quantum information to be perfectly corrigible and characterize the related feedback. Then we analyze the case when perfect correction is not possible and, in the qubit case, we find optimal feedback maximizing the channel fidelity.