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Related Experiment Video

Updated: May 16, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: January 19, 2018

Quantum fluctuations and coherence in high-precision single-electron capture.

Vyacheslavs Kashcheyevs¹, Janis Timoshenko

¹Faculty of Computing, University of Latvia, LV-1586, Riga, Latvia.

Physical Review Letters

|December 11, 2012

Summary

Quantum interference is relevant for single-electron sources. Analyzing nonadiabatic separation reveals quantum beats in back tunneling, turning errors into signals for dynamic quantum dots.

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Area of Science:

Quantum physics
Mesoscopic physics
Quantum information science

Background:

The phase of a quantum state is undefined without a reference point, seemingly limiting quantum interference relevance in deterministic single-electron sources.
Deterministic single-electron sources aim for rapid and complete isolation of individual charge carriers.

Purpose of the Study:

To demonstrate the relevance of quantum interference in single-electron sources by analyzing nonadiabatic separation.
To identify energy scales governing quantum nonadiabatic excitation and back tunneling.
To propose a method for distinguishing these contributions in noncapture events.

Main Methods:

Analysis of nonadiabatic separation of a localized quantum state from a Fermi sea using a closing tunnel barrier.
Modeling the system as a single-lead Landau-Zener back tunneling interferometer in an optimal regime.
Identifying energy scales and predicting quantum phenomena.

Main Results:

Quantum interference is relevant for single-electron sources, contrary to initial assumptions.
The system acts as a Landau-Zener back tunneling interferometer under specific conditions.
Quantum beats in back tunneling are predicted, arising from the dynamical phase accumulated during capture and leakage.

Conclusions:

The study provides a counterexample to the notion that quantum interference is irrelevant for single-electron sources.
The predicted quantum beats in back tunneling can serve as a valuable signal.
This signal can reveal nonadiabatic energy scales of dynamic quantum dots, potentially improving source design and error analysis.