Control of temperature and entropy by frequent quantum measurements

G. Gordon*, N. Erez, G. Kurizki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We study deviations from thermal equilibrium between two-level systems (TLS) and a bath by frequent and brief quantum measurements of the TLS energy-states. The resulting entropy and temperature of both the system and the bath are found to be completely determined by the measurement rate, and unrelated to what is expected by standard thermodynamical rules that hold for Markovian baths. These anomalies allow for very fast control heating, cooling and state-purification (entropy reduction) of quantum systems much sooner than their thermal equilibration time.

Original languageEnglish
Pages (from-to)400-406
Number of pages7
JournalOptics and Spectroscopy (English translation of Optika i Spektroskopiya)
Issue number3
StatePublished - Mar 2010
Externally publishedYes


FundersFunder number
European Commission
German-Israeli Foundation for Scientific Research and Development
Israel Science Foundation


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