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

Valentina Brosco*, Rosario Fazio, F. W J Hekking, J. P. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
140 Downloads (Pure)


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.

Original languageEnglish
Article number024524
Pages (from-to)1-9
Number of pages9
JournalPhysical Review B
Issue number2
Publication statusPublished - 26 Jul 2006
MoE publication typeA1 Journal article-refereed


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