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Related Concept Videos

Semiconductors01:22

Semiconductors

1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.8K
Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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A semiconductor photon-sorter.

A J Bennett1, J P Lee1,2, D J P Ellis1

  • 1Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Science Park, Milton Road, Cambridge CB4 0GZ, UK.

Nature Nanotechnology
|July 19, 2016
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate single-photon interactions using a quantum dot, enabling photon sorting and creating correlated photons. This breakthrough could lead to new quantum optical devices and semiconductor optical switches.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Quantum information science

Background:

  • Achieving significant nonlinear optical effects at the single-photon level is crucial for quantum technologies.
  • Scattering light from quantum emitters is a promising method to generate quantum correlations in photons.

Purpose of the Study:

  • To demonstrate effective photon-photon interactions controlled by a single semiconductor quantum dot.
  • To explore the potential of quantum dots in manipulating single photons for quantum information processing.

Main Methods:

  • Utilizing a single semiconductor quantum dot weakly coupled to a monolithic cavity.
  • Analyzing the modification of photon counting statistics of a coherent light beam due to quantum dot nonlinearity.
  • Employing spin properties of the quantum dot to induce correlations.

Main Results:

  • Observed modification of Poissonian photon statistics, effectively sorting photons by number.
  • Demonstrated the creation of strong correlations between photon detection events.
  • Generated polarization-correlated photons from an uncorrelated stream using a single quantum dot spin.

Conclusions:

  • Single semiconductor quantum dots can effectively mediate photon-photon interactions.
  • This control over single photons opens pathways for novel quantum optical measurements and information processing.
  • The results suggest the feasibility of semiconductor optical switches operated by single photons.