Non-Markovian control of qubit thermodynamics by frequent quantum measurements

Guy Bensky, D. D. Bhaktavatsala Rao, Goren Gordon, Noam Erez, Gershon Kurizki

Research output: Contribution to journalArticlepeer-review

Abstract

We explore the effects of frequent, impulsive quantum non-demolition measurements of the energy of two-level systems (TLS), alias qubits, in contact with a thermal bath. 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 of heating, cooling and state-purification (entropy reduction) of qubits, much sooner than their thermal equilibration time.

Original languageEnglish
Pages (from-to)477-483
Number of pages7
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number3
DOIs
StatePublished - Jan 2010
Externally publishedYes

Keywords

  • Non-Markovian effects
  • Quantum measurements
  • Quantum thermodynamics

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