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Related Concept Videos

Quantum Numbers02:43

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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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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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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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An inductor is ingeniously crafted to accumulate energy within its magnetic field. This field is a direct result of the current that meanders through its coiled structure. When this current maintains a steady state, there is no detectable voltage across the inductor, prompting it to mimic the behavior of a short circuit when faced with direct current.
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum stopwatch: how to store time in a quantum memory.

Yuxiang Yang1,2, Giulio Chiribella3,4, Masahito Hayashi5,6

  • 1Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong.

Proceedings. Mathematical, Physical, and Engineering Sciences
|June 12, 2018
PubMed
Summary
This summary is machine-generated.

Quantum mechanics limits timekeeping accuracy with clock size. This new method uses quantum memory to prevent error accumulation, enhancing measurement precision for complex events and quantum networks.

Keywords:
data compressionquantum clocksquantum metrology

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Area of Science:

  • Quantum mechanics
  • Quantum information science
  • Metrology

Background:

  • Quantum mechanics dictates a trade-off between measurement accuracy and system size.
  • Error accumulation in quantum clocks arises from finite system size, increasing with measurement complexity.
  • Existing methods face challenges in maintaining accuracy for extended time measurements.

Purpose of the Study:

  • To introduce a novel method for accurate time measurement in quantum systems.
  • To overcome the fundamental trade-off between quantum clock accuracy and system size.
  • To reduce error accumulation in sequential time measurements.

Main Methods:

  • Coherent information transfer from a quantum clock to a minimal-size quantum memory.
  • Utilizing quantum entanglement principles for error mitigation.
  • Developing protocols for sequential event duration measurement.

Main Results:

  • Demonstration of a method that, in principle, eludes error accumulation.
  • Enhanced accuracy in measuring the total duration of event sequences.
  • Potential for reduced quantum communication overhead in network clock stabilization.

Conclusions:

  • The proposed method offers a pathway to circumvent traditional accuracy limitations in quantum timekeeping.
  • This approach has significant implications for high-precision metrology and quantum network applications.
  • Further research can explore practical implementations and scalability of this quantum memory-based technique.