Anna Sanpera, Workshop on: QUANTUM INFORMATION PROCESSING FOR QUANTUM COMMUNICATIONS

Workshop on QUANTUM INFORMATION PROCESSING AND QUANTUM COMMUNICATIONS
Quantum Information Processing and Quantum Communications Key distillation from Gaussian states by Gaussian operations
aula 326 - Martedì 15 giugno ore 10.00
	ANNA SANPERA, University of Hannover
>VITAE: Ph.D in Barcelona in the field of Quantum Optics, working on strong laser-atom interactions. From 1993-post-doct in Oxford, and there started to work also on the field of Quantum Information. In 1997-1998 post-doct in Paris (Saclay) and got interested on the field of Cold Gases and Bose-Einstein Condensate. Since 1998 working in the Theoretical Group of Quantum Optics at the University of Hannover, with Habilitation in 2003. Research interest: quantum information theory, quantum cold gases and stong atom-laser interactions.
Abstract
	I want to present the study we did on the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we proved that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with non-positive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-size coherent attacks before the reconciliation process (quant-ph/0405047).