|
Phase coherence of qubits is a central issue in solid state quantum
computation. This has given rise to the need of mesoscopic noise detectors
that can track also the unsymmetric part of nonequilibrium noise . In
addition, the non-Gaussian nature of shot noise (i.e the importance of odd
moments) has enhanced the interest in high resolution noise measurements.
We have investigated the potential of a single mesoscopic JJ as a
detector of shot noise focusing on the case of a strongly resistive
environment, in which Coulomb blockade (CB) of Cooper pair current takes
place owing to the delocalization of the phase variable. In this case the
current enhances distinctly with added nonequilibrium noise.
We find that odd moments of shot noise can
be observed using a Coulomb blockaded Josephson junction. This method is
much more sensitive than other methods to probe asymmetry of the shot noise
|
