Speaker
Prof.
Andrew Semenov
(P.N. Lebedev Physics Institute)
Description
Quantum phase slips (QPS) generate voltage fluctuations in
superconducting nanowires. Employing Keldysh technique and
making use of the phase-charge duality arguments we develop
a theory of QPS-induced voltage noise in such nanowires. We
demonstrate that quantum tunneling of the magnetic flux
quanta across the wire yields quantum shot noise which obeys
Poisson statistics and is characterized by a power law
dependence of its spectrum on the external bias. In the long
wire limit noise spectrum decreases with increasing
frequency and vanishes beyond a threshold value of
frequency in the zero temperature limit. Our predictions can
be directly tested in future experiments with
superconducting nanowires.
Primary author
Prof.
Andrew Semenov
(P.N. Lebedev Physics Institute)
