Quantum flywheel

Amikam Levy, Lajos Diósi, Ronnie Kosloff

Research output: Contribution to journalArticlepeer-review


In this work we present the concept of a quantum flywheel coupled to a quantum heat engine. The flywheel stores useful work in its energy levels, while additional power is extracted continuously from the device. Generally, the energy exchange between a quantum engine and a quantized work repository is accompanied by heat, which degrades the charging efficiency. Specifically when the quantum harmonic oscillator acts as a work repository, quantum and thermal fluctuations dominate the dynamics. Quantum monitoring and feedback control are applied to the flywheel in order to reach steady state and regulate its operation. To maximize the charging efficiency one needs a balance between the information gained by measuring the system and the information fed back to the system. The dynamics of the flywheel are described by a stochastic master equation that accounts for the engine, the external driving, the measurement, and the feedback operations.

Original languageEnglish
Article number052119
JournalPhysical Review A
Issue number5
StatePublished - 27 May 2016
Externally publishedYes


Dive into the research topics of 'Quantum flywheel'. Together they form a unique fingerprint.

Cite this