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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

745
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Ultrabright Quantum Photon Sources on Chip.

Zhaohui Ma1, Jia-Yang Chen1, Zhan Li1

  • 1Department of Physics, Stevens Institute of Technology, 1 Castle Point Terrace, Hoboken, New Jersey 07030, USA and Center for Quantum Science and Engineering, Stevens Institute of Technology, 1 Castle Point Terrace, Hoboken, New Jersey 07030, USA.

Physical Review Letters
|January 15, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel chip-based quantum photon source using periodically poled lithium niobate microresonators. This breakthrough achieves unprecedented rates and purity for quantum information processing, significantly advancing the field.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Nanophotonics

Background:

  • Scalable quantum information systems require high-rate, high-brightness, and high-purity quantum photon sources.
  • Existing sources face limitations in performance and scalability for practical applications.

Purpose of the Study:

  • To demonstrate a chip-based quantum photon source with significantly improved performance metrics.
  • To leverage giant optical nonlinearity in periodically poled lithium niobate for enhanced photon generation.

Main Methods:

  • Fabrication of a periodically poled lithium niobate microresonator on a chip.
  • Utilizing spontaneous parametric down-conversion for photon-pair generation.
  • Direct measurement of giant single-photon nonlinearity and autocorrelation functions.

Main Results:

  • Achieved photon-pair generation rates of 8.5 and 36.3 MHz at low microwatt pump powers (3.4 and 13.4 μW).
  • Demonstrated orders-of-magnitude improvement in generation rate and brightness over state-of-the-art sources across all material platforms.
  • Obtained high coincidence-to-accidental ratios (>100) and low autocorrelation values (gH(2)(0) = 0.008, 0.097) for heralded single photons.

Conclusions:

  • The developed chip device exhibits noiseless and giant optical nonlinearity, enabling record-breaking performance for quantum photon generation.
  • This advancement is crucial for the widespread adoption of quantum optical information technologies.
  • The results pave the way for next-generation quantum computing and communication systems.