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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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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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A single-photon switch and transistor enabled by a solid-state quantum memory.

Shuo Sun1, Hyochul Kim1, Zhouchen Luo1

  • 1Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, MD 20742, USA.

Science (New York, N.Y.)
|July 7, 2018
PubMed
Summary
This summary is machine-generated.

We developed a solid-state quantum memory that acts as a single-photon switch and transistor. This breakthrough enables deterministic control of optical signals using single photons for quantum computing and networking.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Nanophotonics

Background:

  • Single-photon switches and transistors are crucial for quantum circuits and networks, enabling strong photon-photon interactions.
  • Achieving deterministic control of optical signals with single photons requires robust quantum memory, which has been a challenge in solid-state platforms.

Purpose of the Study:

  • To demonstrate a functional single-photon switch and transistor utilizing a solid-state quantum memory.
  • To investigate the potential of semiconductor nanophotonic devices for high-bandwidth photonic quantum information processing.

Main Methods:

  • Fabrication of a device comprising a semiconductor spin qubit strongly coupled to a nanophotonic cavity.
  • Utilizing the spin qubit as a quantum memory to control photon-photon interactions.

Main Results:

  • Demonstrated a single-photon switch and transistor based on a solid-state quantum memory.
  • A single 63-picosecond gate photon successfully switched a signal field with an average of 27.7 photons.
  • The device exhibited controlled photon-photon interactions before resetting its internal state.

Conclusions:

  • Semiconductor nanophotonic devices can achieve strong and controlled photon-photon interactions.
  • The developed device shows promise for enabling high-bandwidth photonic quantum information processing.