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

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

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

11 Sitaatiot (Scopus)
148 Lataukset (Pure)

Abstrakti

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.

AlkuperäiskieliEnglanti
Artikkeli024524
Sivut1-9
Sivumäärä9
JulkaisuPhysical Review B
Vuosikerta74
Numero2
DOI - pysyväislinkit
TilaJulkaistu - 26 heinäkuuta 2006
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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