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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Single-Photon Synchronization with a Room-Temperature Atomic Quantum Memory.

Omri Davidson1, Ohad Yogev1, Eilon Poem1

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.

Physical Review Letters
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Summary
This summary is machine-generated.

We demonstrate efficient synchronization of single photons using a room-temperature atomic quantum memory. This breakthrough significantly boosts photon-pair coincidence rates, advancing quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Photonics

Background:

  • Efficient synchronization of single photons is crucial for quantum information processing.
  • Compatibility with narrow-band atomic transitions remains a significant challenge.

Purpose of the Study:

  • To report on the synchronization of independently generated single photons.
  • To utilize a room-temperature atomic quantum memory for photon synchronization.

Main Methods:

  • Employing a fiber-interconnected photon source and atomic quantum memory with a ladder-level atomic scheme.
  • Storing and retrieving heralded single photons.
  • Verifying photon indistinguishability using Hong-Ou-Mandel interference.

Main Results:

  • Achieved an end-to-end efficiency of 25% and final antibunching of g(2) = 0.023.
  • Increased photon-pair coincidence rate by over tenfold, exceeding 1000 detected synchronized pairs per second.
  • Demonstrated indistinguishability of synchronized photons.

Conclusions:

  • The developed synchronization method is highly efficient and compatible with atomic transitions.
  • This technique significantly enhances the rate of synchronized photon pairs.
  • The results pave the way for practical photonic quantum information processing.