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Related Experiment Video

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Feedback control of quantum transport.

Tobias Brandes¹

¹Institut für Theoretische Physik, Hardenbergstraße 36, TU Berlin, D-10623 Berlin, Germany.

Physical Review Letters

|September 28, 2010

Summary

This summary is machine-generated.

A classical feedback loop stabilizes current through nanostructures by adjusting parameters, enabling precise single-particle transfers. This method allows reconstructing full counting statistics from the resulting frozen distribution.

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Area of Science:

Quantum physics
Mesoscopic physics
Nanotechnology

Background:

Electron transport through nanostructures is crucial for quantum technologies.
Fluctuations in particle transfer hinder precise control.
Classical feedback loops offer a potential solution for stabilizing quantum transport.

Purpose of the Study:

To investigate the stabilization of current through nanostructures using a classical feedback loop.
To demonstrate the achievement of highly accurate, continuous single-particle transfers.
To develop a method for reconstructing full counting statistics from a stabilized system.

Main Methods:

Implementing a classical feedback loop to adjust system parameters based on the number of tunnelled particles (n).
Analyzing the system's behavior at large times to observe the freezing of fluctuations in n.
Developing a reconstruction technique for full counting statistics from the frozen distribution under specific feedback conditions.

Main Results:

The feedback loop effectively stabilizes the current through nanostructures.
Fluctuations in the number of tunnelled particles (n) are frozen at large times.
Highly accurate and continuous single-particle transfers are achieved.
A method to reconstruct the original full counting statistics from the frozen distribution is demonstrated for the simplest feedback case.

Conclusions:

Classical feedback loops are effective in stabilizing quantum transport through nanostructures.
The freezing of particle number fluctuations enables precise single-particle transfer.
The developed method provides a way to recover detailed statistical information about quantum transport.