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Related Concept Videos

Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
Downstream Processing01:29

Downstream Processing

Downstream processing begins once fermentation is complete and involves a series of steps to recover and purify products such as acids, vitamins, antibiotics, or proteins.Cell HarvestingFor example, for intracellular protein-based products, the first step is harvesting the cells. This is typically achieved using centrifugation or filtration to separate the cells from the liquid phase.Cell Disruption for Intracellular ProductsIf the target product is intracellular, the harvested cells must be...
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Network Function of a Circuit01:25

Network Function of a Circuit

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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

Updated: Jun 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Frequency downconversion for a quantum network.

Yu Ding1, Z Y Ou

  • 1Department of Physics, Indiana University-Purdue University Indianapolis,402 N. Blackford Street, Indianapolis, Indiana 46202, USA.

Optics Letters
|August 4, 2010
PubMed
Summary
This summary is machine-generated.

We demonstrate noise-free coherent frequency downconversion of photons, preserving quantum coherence. This breakthrough enables high-fidelity quantum state transfer and advances quantum networking with a novel single-photon WDM method.

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Last Updated: Jun 10, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Published on: September 8, 2023

Area of Science:

  • Quantum optics
  • Quantum information science
  • Photonics

Background:

  • Parametric downconversion is a key quantum optical process.
  • Quantum noise often limits the fidelity of frequency conversion.
  • Coherent quantum state transfer is crucial for quantum networks.

Purpose of the Study:

  • To demonstrate noise-free coherent frequency downconversion of photons.
  • To show preservation of quantum coherence during frequency conversion.
  • To propose a novel method for single-photon wavelength-division multiplexing (WDM).

Main Methods:

  • Utilizing parametric downconversion with strong signal field injection.
  • Performing interference experiments to verify coherence preservation.
  • Developing a scheme for coherent frequency downconversion of photons.

Main Results:

  • Achieved coherent frequency downconversion from pump to idler photon.
  • Demonstrated that the process can be free of quantum noise.
  • Confirmed coherence preservation through interference experiments.

Conclusions:

  • Coherent frequency downconversion can be achieved with high fidelity and without quantum noise.
  • This technique facilitates high-fidelity quantum state transfer between photons of different frequencies.
  • The proposed method establishes a crucial link for quantum networks and enables single-photon WDM.