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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Approaching microwave photon sensitivity with Al Josephson junctions.

Andrey L Pankratov1,2,3, Anna V Gordeeva1,2, Leonid S Revin1,2

  • 1Nizhny Novgorod State Technical University n.a. R.E. Alekseev, GSP-41, Nizhny Novgorod, 603950, Russia.

Beilstein Journal of Nanotechnology
|July 25, 2022
PubMed
Summary
This summary is machine-generated.

This study shows that a small aluminium Josephson junction can detect single microwave photons. The junction switches states upon absorbing three or more photons, demonstrating its potential as a photon counter.

Keywords:
Josephson junctionmicrowave photonssingle photon counterthermal activation

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Area of Science:

  • Quantum optics
  • Superconducting electronics

Background:

  • Josephson junctions are sensitive to electromagnetic radiation.
  • Single photon detection is crucial for quantum information processing.

Purpose of the Study:

  • To evaluate an aluminium Josephson junction as a microwave single photon counter.
  • To investigate the photon absorption mechanism in the junction.

Main Methods:

  • Fabrication of a few-micrometer aluminium Josephson junction.
  • Measurement of junction switching probability with 10 GHz photon absorption.
  • Analysis of switching probability dependence on signal power.

Main Results:

  • The Josephson junction exhibits switching from superconducting to resistive state upon photon absorption.
  • Switching is initiated by the simultaneous absorption of three or more photons.
  • A dark count time exceeding 0.01 seconds was observed.

Conclusions:

  • Aluminium Josephson junctions are viable for single microwave photon counting.
  • The device operates by absorbing multiple photons, indicating a specific detection mechanism.
  • The observed dark count time suggests practical applicability for quantum experiments.