QUANTUM STATE ESTIMATION AND LARGE DEVIATIONS
نویسندگان
چکیده
منابع مشابه
Quantum state estimation and large deviations
In this paper we propose a method to estimate the density matrix ρ of a d-level quantum system by measurements on the N-fold system in the joint state ρ . The scheme is based on covariant observables and representation theory of unitary groups and it extends previous results concerning the estimation of the spectrum of ρ. We show that it is consistent (i.e. the original input state ρ is recover...
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The probability of observing a large deviation (LD) in the number of particles in a region L in a dilute quantum gas contained in a much larger region V is shown to decay as exp[− |L| DF], where |L| is the volume of L and DF is the change in the appropriate free energy density, the same as in classical systems. However, in contrast with the classical case, where this formula holds at all temper...
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ژورنال
عنوان ژورنال: Reviews in Mathematical Physics
سال: 2006
ISSN: 0129-055X,1793-6659
DOI: 10.1142/s0129055x06002565