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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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...
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 12, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Interference of single photons from two separate semiconductor quantum dots.

Edward B Flagg1, Andreas Muller, Sergey V Polyakov

  • 1Joint Quantum Institute, National Institute of Standards and Technology & University of Maryland, Gaithersburg, Maryland, USA. edward.flagg@nist.gov

Physical Review Letters
|May 21, 2010
PubMed
Summary

We demonstrated interference between discrete photons from two quantum dot sources. Tuning quantum dot energies into resonance enhanced photon coalescence probability to 47% under specific conditions.

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Last Updated: Jun 12, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Published on: October 13, 2017

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Nanophotonics

Background:

  • Quantum dots are promising sources for single photons.
  • Interference of photons from separate quantum emitters is crucial for quantum information processing.
  • Achieving high indistinguishability and coalescence is challenging due to environmental factors.

Purpose of the Study:

  • To demonstrate and characterize quantum interference between discrete photons from two separate semiconductor quantum dot (QD) sources.
  • To investigate the effect of tuning QD energies into resonance on photon coalescence.
  • To analyze factors limiting photon coalescence probability.

Main Methods:

  • Utilized pulsed laser excitation for two separate semiconductor quantum dot samples.
  • Employed strain to tune the emission energies of the quantum dots into resonance.
  • Measured photon coalescence probability and coincidence rates.
  • Applied postselection based on a narrow time window.

Main Results:

  • Achieved a total photon coalescence probability of 18.1%.
  • Observed coincidence rates below the classical limit, indicating quantum interference.
  • Increased coalescence probability to 47% via postselection of coincidences within a narrow time window.
  • Identified dephasing and detector time response as key factors reducing coalescence probability from unity.

Conclusions:

  • Demonstrated successful interference between photons from distinct quantum dot sources.
  • Showcased strain-induced resonance as an effective method for enhancing photon indistinguishability.
  • Highlighted the impact of dephasing and detector limitations on achieving ideal quantum interference, providing insights for future quantum optical experiments.