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Related Concept Videos

Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Related Experiment Video

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Microwave photon counter based on Josephson junctions.

Y-F Chen1, D Hover, S Sendelbach

  • 1Department of Physics, University of Wisconsin, Madison, 53706, USA.

Physical Review Letters
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

We developed a microwave photon counter using Josephson junctions to detect single photons. This device shows photon bunching in a thermal microwave field, paving the way for number-resolved photon counting.

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Related Experiment Videos

Last Updated: May 26, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Published on: April 4, 2017

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

  • Quantum optics
  • Superconducting electronics

Background:

  • Accurate detection and counting of single microwave photons are crucial for quantum information processing and fundamental physics experiments.
  • Existing methods often lack the sensitivity or resolution required for precise quantum measurements.

Purpose of the Study:

  • To develop a novel microwave photon counter utilizing Josephson junctions.
  • To demonstrate the capability of the device for single microwave photon detection and characterization.
  • To explore the scalability of the design for advanced quantum measurements.

Main Methods:

  • Fabrication and characterization of a current-biased Josephson junction as a single microwave photon detector.
  • Implementation of a microwave Hanbury Brown-Twiss experiment using two Josephson junction detectors at 4 GHz.
  • Analysis of photon statistics to identify photon bunching behavior.

Main Results:

  • The Josephson junction detector successfully absorbed and registered single microwave photons, transitioning to a measurable voltage state.
  • The Hanbury Brown-Twiss experiment revealed a clear signature of photon bunching from a thermal microwave source, confirming the detector's sensitivity.
  • The detector design demonstrates potential for parallelization to achieve number-resolved photon counting.

Conclusions:

  • Josephson junction-based detectors offer a promising platform for single microwave photon counting.
  • The demonstrated Hanbury Brown-Twiss experiment validates the detector's performance and sensitivity.
  • Scalable designs could enable advanced quantum technologies requiring precise microwave photon number resolution.