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

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Published on: August 2, 2019

Distinguishing quantum and classical transport through nanostructures.

Neill Lambert¹, Clive Emary, Yueh-Nan Chen

¹The Institute of Physical and Chemical Research, RIKEN, Saitama, Japan.

Physical Review Letters

|January 15, 2011

Summary

Researchers developed inequalities to differentiate quantum from classical transport in nanostructures. Violating these inequalities signals non-classical, non-Markovian physics in the system, advancing quantum transport understanding.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Distinguishing quantum from classical transport is crucial for understanding electron behavior in nanostructures.
Current models often assume classical Markovian dynamics, which may not capture all quantum phenomena.

Purpose of the Study:

To derive criteria for identifying quantum transport phenomena in nanostructures.
To develop a method for distinguishing classical Markovian transport from more complex quantum processes.

Main Methods:

Derivation of two inequalities for temporal correlations in non-equilibrium transport.
Application of inequalities to local charge measurements and current flow in double quantum dots.

Main Results:

Established a general inequality for local charge measurements.
Derived a specific inequality for current flow in double quantum dots.
Demonstrated that violation of these inequalities indicates non-classical, non-Markovian physics.

Conclusions:

The derived inequalities provide a powerful tool for detecting quantum transport.
Violation signifies the presence of physics beyond classical Markovian models.
This work offers a pathway to experimentally probe quantum effects in nanodevices.