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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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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum optical circulator controlled by a single chirally coupled atom.

Michael Scheucher1, Adèle Hilico1, Elisa Will1

  • 1Vienna Center for Quantum Science and Technology, Atominstitut, Technischen Universität Wien Stadionallee 2, 1020 Vienna, Austria.

Science (New York, N.Y.)
|December 13, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a fiber-integrated quantum optical circulator using a single atom. The atom’s quantum state controls signal direction, enabling advanced photonic circuit applications.

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Area of Science:

  • Quantum optics
  • Integrated photonics
  • Atomic physics

Background:

  • Nonreciprocal optical components are crucial for signal routing in photonic circuits.
  • Existing components often lack the precise control needed for quantum applications.

Purpose of the Study:

  • To demonstrate a fiber-integrated quantum optical circulator controlled by a single atom.
  • To explore the potential of atom-controlled nonreciprocity for quantum information processing.

Main Methods:

  • Utilizing the chiral interaction between a single atom and confined light.
  • Leveraging the atom's internal quantum state to dictate the circulator's operation direction.
  • Investigating the circulator's response at the single-photon level.

Main Results:

  • Successful demonstration of a fiber-integrated quantum optical circulator.
  • Atom's quantum state was shown to control the direction of signal propagation.
  • A strongly nonlinear response at the single-photon level was observed.

Conclusions:

  • The single-atom-controlled circulator offers photon number-dependent routing.
  • This device enables novel quantum simulation protocols.
  • It holds potential as a key element for scalable quantum information processing in integrated optical circuits.