Qubits as devices to detect the third moment of current fluctuations
arXiv:cond-mat/0603844 · doi:10.1103/PhysRevB.74.024524
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.
10 pages, 7 figures
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- Josephson junction detector of non-Gaussian noise
- Detection of finite frequency current moments with a dissipative resonant circuit
- Quantum detectors for the third cumulant of current fluctuations
- Feedback and Rate Asymmetry of the Josephson Junction Noise Detector
- Detecting Current Noise with a Josephson Junction in the Macroscopic Quantum Tunneling Regime
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