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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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A stand-alone fiber-coupled single-photon source.

Alexander Schlehahn1, Sarah Fischbach1, Ronny Schmidt1

  • 1Institut für Festkörperphysik, Technische Universität Berlin, 10623, Berlin, Germany.

Scientific Reports
|January 24, 2018
PubMed
Summary
This summary is machine-generated.

We developed a plug-and-play quantum light source using quantum dots emitting single photons. This stable, fiber-coupled device demonstrates robust non-classical light generation for practical quantum applications.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics
  • Nanotechnology

Background:

  • Development of practical quantum light sources is crucial for advancing quantum technologies.
  • Existing sources often face challenges with stability, fiber coupling, and ease of use.

Purpose of the Study:

  • To present a stand-alone, fiber-coupled quantum light source based on optically driven quantum dots.
  • To demonstrate a practical, stable, and user-friendly device for single-photon generation.

Main Methods:

  • Deterministic integration of quantum dots into monolithic microlenses.
  • Precise fiber coupling using active optical alignment and epoxide bonding.
  • Packaging the fiber-emitter assembly in a compact Stirling cryocooler.
  • Characterization via photon auto-correlation measurements (g(2)(0)) and endurance testing.

Main Results:

  • Achieved g(2)(0) = 0.07 ± 0.05, indicating high-quality single-photon emission.
  • Demonstrated triggered non-classical light at 80 MHz repetition rate.
  • Showcased long-term stability (within 4% over cycles) and 100-hour continuous operation.
  • Reported stable single-photon count rates up to 11.7 kHz with 4% standard deviation.

Conclusions:

  • The developed quantum light source is a practical, stable, and high-performance device.
  • Its plug-and-play nature and robust performance make it suitable for various quantum applications.
  • This work represents a significant step towards deployable quantum photonic systems.