Non-Gaussian low-frequency noise as a source of qubit decoherence

Details Non-Gaussian low-frequency noise as a source of qubit decoherence Non-Gaussian low-frequency noise as a source of qubit decoherence

2005-11-09

arxiv.org/abs/cond-mat/0511238v1

Phys. Rev. Lett. 96, 097009 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.097009

We study decoherence in a qubit with the distance between the two levels affected by random flips of bistable fluctuators. For the case of a single fluctuator we evaluate explicitly an exact expression for the phase-memory decay in the echo experiment with a resonant ac excitation. The echo signal as a function of time shows a sequence of plateaus. The position and the height of the plateaus can be used to extract the fluctuator switching rate \gamma and its coupling strength v. At small times the logarithm of the echo signal is proportional to t^3. The plateaus disappear when the decoherence is induced by many fluctuators. In this case the echo signal depends on the distribution of the fluctuators parameters. According to our analysis, the results significantly deviate from those obtained in the Gaussian model as soon as v greater than \gamma.

Affiliated with

Also associated with

No associations

Rating

Non-Gaussian low-frequency noise as a source of qubit decoherence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Non-Gaussian low-frequency noise as a source of qubit decoherence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-Gaussian low-frequency noise as a source of qubit decoherence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-104834