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Temperature Measurement Sites01:14

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...

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Related Experiment Video

Updated: Jul 13, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Room-temperature single-photon source with near-millisecond built-in memory.

Karsten B Dideriksen1, Rebecca Schmieg1, Michael Zugenmaier1

  • 1Niels Bohr Institute, University of Copenhagen, Copenhagen Ø, Denmark.

Nature Communications
|June 18, 2021
PubMed
Summary

We developed a room-temperature single-photon source using atomic vapor with extended memory. This breakthrough enables on-demand quantum network applications with high photon purity and long-lasting quantum correlations.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Atomic Physics

Background:

  • Non-classical photon sources are essential for quantum networks.
  • Room-temperature atomic vapors offer scalable and robust quantum memories.
  • Existing room-temperature sources face limitations in memory time or photon purity.

Purpose of the Study:

  • To demonstrate a high-performance single-photon source utilizing room-temperature atomic vapor memory.
  • To achieve on-demand photon retrieval with extended storage times and high fidelity.
  • To validate the quantum correlations and single-photon purity of the retrieved light.

Main Methods:

  • Heralded loading of single photons into a room-temperature atomic vapor memory.
  • Variable-time retrieval of stored photons.
  • Characterization of single-photon purity via antibunching measurements.
  • Verification of non-classical correlations over extended durations.

Main Results:

  • Demonstrated a single-photon source with strong suppression of two-photon components (low antibunching).
  • Maintained non-classical correlations for up to 100 ms, exceeding previous room-temperature records by two orders of magnitude.
  • Confirmed correlations sufficient for Bell inequality violation lasting up to 0.15 ms.

Conclusions:

  • This work presents a significant advancement in room-temperature quantum memory-based photon sources.
  • The demonstrated performance paves the way for practical, on-demand quantum network components.
  • The extended correlation times open new possibilities for distributed quantum computing and secure communication.