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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Noise-induced phase transition in the electronic Mach-Zehnder interferometer.

Ivan P Levkivskyi¹, Eugene V Sukhorukov

¹Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.

Physical Review Letters

|August 8, 2009

Summary

We studied dephasing in electronic Mach-Zehnder interferometers affected by quantum point contact noise. High noise levels surprisingly restore interference visibility, revealing a sharp transition at specific quantum point contact transparency.

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Area of Science:

Quantum electronics
Mesoscopic physics
Condensed matter theory

Background:

Electronic Mach-Zehnder interferometers are key for quantum information processing.
Dephasing due to current noise degrades interference visibility.
Quantum point contacts (QPCs) are tunable electronic components influencing noise.

Purpose of the Study:

Investigate dephasing effects in a Mach-Zehnder interferometer coupled to a voltage-biased QPC.
Analyze the influence of QPC-generated current noise on Aharonov-Bohm oscillation visibility.
Determine the relationship between visibility, voltage bias, and QPC transparency.

Main Methods:

Theoretical modeling of dephasing in the interferometer.
Calculation of Aharonov-Bohm oscillation visibility.
Utilizing the cumulant generating function of noise to characterize QPC effects.
Analysis of the large-bias regime and high-order current cumulants.

Main Results:

Visibility is suppressed by QPC noise, but this suppression depends on voltage bias.
High-order cumulants of current counteract the noise-induced dilution effect in the large-bias regime.
An abrupt change in visibility dependence occurs at QPC transparency T=1/2.
Quantum fluctuations near T=1/2 lead to a smeared, rather than perfectly sharp, transition.

Conclusions:

The interplay between QPC noise and interferometer dephasing exhibits non-trivial behavior.
The critical transparency T=1/2 marks a significant shift in how noise affects quantum interference.
Understanding these effects is crucial for designing robust quantum electronic devices.