Superactivation of quantum reference frames

Superactivation of quantum reference frames

Seminar author:Giulio Chiribella

Event date and time:03/25/2015 02:30:pm

Event location:IFAE seminar room

Event contact:

Quantum particles with spin are the most elementary gyroscopes existing in nature. Can two such gyroscopes help two distant observers find out their relative orientation in space? Here we show that a single pair of gyroscopes in an EPR state gives little clue about the relative orientation, but when two or more EPR pairs are used in parallel, suddenly a common reference frame emerges, with an error that drops quickly with the size of the system, beating than the best classical scaling already for small number of copies. This activation phenomenon indicates the presence of a latent resource hidden into EPR correlations, which can be unlocked and turned into advantage when multiple copies are available.