Finite-time availability in a quantum system
1 Department of Physics, Technische Universität Chemnitz - D-09107 Chemnitz, Germany
2 Department of Mathematical Sciences, San Diego State University - San Diego, CA 92182, USA
Received: 30 October 2014
Accepted: 4 February 2015
Classically, availability refers to the work available in any reversible process that brings about equilibrium between the system and its environment. Here we introduce an additional meaning of availability as the maximum work associated with the change of an external parameter in the Hamiltonian of a quantum system. This availability can be gained in a FEAT process and for times larger than or equal to the FEAT time, there exists an optimal control that achieves the available work. For shorter times, quantum friction effects are unavoidable and the available work is thereby lowered. This finite-time availability is quantified here as a function of the time available.
PACS: 05.70.-a – Thermodynamics / 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.Ac – Quantum algorithms, protocols, and simulations
© EPLA, 2015