Coupled qubits as a quantum heat switch. (30th August 2017)

• Record Type: Journal Article
• Authors: Karimi, B; Pekola, J P; Campisi, M; Fazio, R
• Is Part Of: Quantum science and technology. Volume 2:Number 4(2017)
• Publication Date: 2017-08-30
• Subjects: superconducting qubit -- heat transport -- quantum heat switch; Quantum theory -- Periodicals; Quantum theory; Periodicals; 530
• DOI: 10.1088/2058-9565/aa8330
• Languages: English
• ISSNs: 2058-9565

Abstract

Abstract: We present a quantum heat switch based on coupled superconducting qubits, connected to two LC resonators that are terminated by resistors providing two heat baths. To describe the system, we use a standard second order master equation with respect to coupling to the baths. We find that this system can act as an efficient heat switch controlled by the applied magnetic flux. The flux influences the energy level separations of the system, and under some conditions, the finite coupling of the qubits enhances the transmitted power between the two baths, by an order of magnitude under realistic conditions. At the same time, the bandwidth at maximum power of the switch formed of the coupled qubits is narrowed.