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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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IR Spectrum Peak Intensity: Dipole Moment01:20

IR Spectrum Peak Intensity: Dipole Moment

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The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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Updated: Jul 20, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Quantum Induced Coherence Light Detection and Ranging.

Gewei Qian1, Xingqi Xu1, Shun-An Zhu1

  • 1Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, Zhejiang University, Hangzhou 310027, Zhejiang Province, China.

Physical Review Letters
|August 4, 2023
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Summary
This summary is machine-generated.

Quantum induced coherence (QuIC) LiDAR offers inherent immunity to noise, overcoming limitations of traditional quantum LiDAR. This novel approach uses entangled photons for precise distance measurements, unaffected by background or jamming light.

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Area of Science:

  • Quantum optics
  • Quantum sensing
  • LiDAR technology

Background:

  • Traditional quantum LiDAR (light detection and ranging) improves signal-to-noise ratio (SNR) but is limited by detector timing jitter and jamming noise.
  • Direct detection of reflected photons in conventional LiDAR degrades SNR with increasing background noise.

Purpose of the Study:

  • To design, construct, and validate a quantum induced coherence (QuIC) LiDAR system.
  • To demonstrate noise immunity in quantum LiDAR systems, overcoming limitations of existing methods.

Main Methods:

  • Utilizing principles from the Zou-Wang-Mandel experiment.
  • Implementing a QuIC LiDAR system that detects entangled reference photons instead of reflected probe photons.
  • Employing single-photon interference fringes of reference photons for distance measurement.
  • Using reflected probe photons to erase path information of reference photons.

Main Results:

  • The QuIC LiDAR system demonstrated inherent immunity to ambient and jamming noises.
  • Noise accompanying reflected probe light had no effect on the detected signal.
  • Noise resilience was validated using both LED and laser light sources to simulate background and jamming noise.

Conclusions:

  • The QuIC LiDAR method provides a novel approach to combat noise in precise quantum electromagnetic sensing and ranging.
  • This technique enhances the robustness of LiDAR systems against environmental and intentional interference.