Quantacell: powerful charging of quantum batteries. (22nd July 2015)

• Record Type: Journal Article
• Authors: Binder, Felix C; Vinjanampathy, Sai; Modi, Kavan; Goold, John
• Is Part Of: New journal of physics. Volume 17:Number 7(2015:Jul.)
• Publication Date: 2015-07-22
• Subjects: quantum thermodynamics -- quantum information -- work extraction; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/17/7/075015
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We study the problem of charging a quantum battery in finite time. We demonstrate an analytical optimal protocol for the case of a single qubit. Extending this analysis to an array of N qubits, we demonstrate that an N-fold advantage in power per qubit can be achieved when global operations are permitted. The exemplary analytic argument for this quantum advantage in the charging power is backed up by numerical analysis using optimal control techniques. It is demonstrated that the quantum advantage for power holds when, with cyclic operation in mind, initial and final states are required to be separable.