Quantum diffusion: A simple, exactly solvable model
نویسندگان
چکیده
منابع مشابه
Exactly solvable model of quantum diffusion
We study the transport property of diffusion in a finite translationally invariant quantum subsystem described by a tight-binding Hamiltonian with a single energy band. The subsystem interacts with its environment by a coupling expressed in terms of correlation functions which are deltacorrelated in space and time. For weak coupling, the time evolution of the subsystem density matrix is ruled b...
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∆P = ∆Q = 1/ √ 2 and σP = σQ = √ W we simultaneously maximize σPσQ and minimize ∆P̃∆Q̃ while satisfying all the constraints in Eq. (5). We thus find a capacity of log(W/μ). In a similar way, when μ < 1/2, ∆P̃∆Q̃ is minimized by ∆P = ∆Q = 1/ √ 2 so that by the same argument the capacity is now log(2W ). A lower bound for the capacity of the classical noise channel with noise power μ is ( g(W − 1/2 +...
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ژورنال
عنوان ژورنال: Physica A: Statistical Mechanics and its Applications
سال: 2015
ISSN: 0378-4371
DOI: 10.1016/j.physa.2014.09.041