Model of qubits as devices to detect the third moment of current fluctuations

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© 2006 American Physical Society (APS). http://www.aps.org/
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2006
Major/Subject
Mcode
Degree programme
Language
en
Pages
024524/1-9
Series
Physical Review B, Volume 74, Issue 2
Abstract
Under appropriate conditions, controllable two-level systems can be used to detect the third moment of current fluctuations. We derive a master equation for a quantum system coupled to a bath valid to the third order in the coupling between the system and the environment. In this approximation the reduced dynamics of the quantum system depends on the frequency-dependent third moment. Specializing to the case of a controllable two-level system (a qubit) and in the limit in which the splitting between the levels is much smaller than the characteristic frequency of the third moment, it is possible to show that the decay of the qubit has additional oscillations whose amplitude is directly proportional to the value of the third moment. We discuss an experimental setup where this effect can be seen.
Description
Keywords
current fluctuations, quantum system
Other note
Citation
Brosco, Valentina & Fazio, Rosario & Hekking, F. W. J. & Pekola, Jukka. 2006. Model of qubits as devices to detect the third moment of current fluctuations. Physical Review B. Volume 74, Issue 2. 024524/1-9. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.74.024524.