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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
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Variation: Normal Distribution, Range, and Standard Deviation02:32

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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Visualizing Subcellular Localization of a Protein in the Heart Using Quantum Dots-Mediated Immuno-Labeling Followed by Transmission Electron Microscopy
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Long-Range Big Quantum-Data Transmission.

M Zwerger1,2, A Pirker1, V Dunjko1,3

  • 1Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21a, 6020 Innsbruck, Austria.

Physical Review Letters
|February 6, 2018
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Summary
This summary is machine-generated.

We present a new quantum repeater for long-distance quantum communication. This scalable design uses hashing and tolerates errors, enabling intercontinental quantum data transmission with high rates.

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Area of Science:

  • Quantum communication
  • Quantum information science
  • Quantum networking

Background:

  • Long-distance quantum communication is crucial for quantum networks.
  • Existing quantum repeater schemes face challenges with scalability and resource overhead.
  • Deterministic entanglement distillation protocols are key to improving repeater performance.

Purpose of the Study:

  • To introduce a novel, scalable quantum repeater architecture.
  • To demonstrate improved distance scaling and resource efficiency for quantum repeaters.
  • To enable robust long-distance quantum communication, including for large quantum data.

Main Methods:

  • Employing hashing, a deterministic entanglement distillation protocol.
  • Utilizing one-way communication for entanglement purification.
  • Implementing a measurement-based quantum repeater scheme.

Main Results:

  • Achieved a scalable scheme with constant resource overhead per repeater station.
  • Demonstrated the potential for ultrahigh communication rates over arbitrary distances.
  • Showcased tolerance to high loss and operational/memory errors (several percent per qubit).
  • Confirmed feasibility for intercontinental distances with moderate qubit resources (hundreds per station).

Conclusions:

  • The proposed quantum repeater offers a scalable and efficient solution for long-distance quantum communication.
  • This approach facilitates the transmission of large quantum data across continents.
  • The scheme's robustness to errors opens avenues for practical quantum network development.