Coherence oscillations in dephasing by non-Gaussian shot noise
Abstrak
A non-perturbative treatment is developed for the dephasing produced by the shot noise of a one-dimensional electron channel. It is applied to two systems: a charge qubit and the electronic Mach–Zehnder interferometer (MZI), both of them interacting with an adjacent partitioned electronic channel acting as a detector. We find that the visibility (interference contrast) can display oscillations as a function of detector voltage and interaction time. This is a unique consequence of the non-Gaussian properties of the shot noise, and only occurs in the strong coupling regime, when the phase contributed by a single electron exceeds π. The resulting formula reproduces the recent surprising experimental observations reported in (I Neder et al 2006 Preprint cond-mat/0610634), and indicates a general explanation for similar visibility oscillations observed earlier in the MZI at large bias voltage. We explore in detail the full pattern of oscillations as a function of coupling strength, voltage and time, which might be observable in future experiments.
Topik & Kata Kunci
Penulis (2)
I. Neder
F. Marquardt
Akses Cepat
- Tahun Terbit
- 2006
- Bahasa
- en
- Total Sitasi
- 32×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1088/1367-2630/9/5/112
- Akses
- Open Access ✓