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Related Concept Videos

The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Related Experiment Video

Updated: Jul 2, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Experimental demonstration of a BDCZ quantum repeater node.

Zhen-Sheng Yuan1, Yu-Ao Chen, Bo Zhao

  • 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany.

Nature
|August 30, 2008
PubMed
Summary

Researchers demonstrate entanglement swapping with atomic quantum memories, a key step towards building quantum repeaters for long-distance quantum communication. This overcomes photon loss challenges, enabling secure information exchange over extended networks.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Networks

Background:

  • Quantum communication enables secure information exchange but faces distance limitations due to photon loss.
  • Briegel, Dür, Cirac, and Zoller (BDCZ) proposed quantum repeaters using entanglement swapping and quantum memory to overcome these limitations.
  • Implementing BDCZ quantum repeaters is challenging due to difficulties in integrating quantum memory.

Purpose of the Study:

  • To realize entanglement swapping with integrated quantum memory, a crucial building block for BDCZ quantum repeaters.
  • To demonstrate a scheme combining BDCZ strategies with atomic quantum memories.
  • To establish the essential element for creating quantum repeaters with stationary atomic qubits and flying photonic qubits.

Main Methods:

  • Utilized two atomic ensembles, each entangled with a single photon.
  • Performed a joint Bell state measurement on photons after transmission through a 300-m fiber channel.
  • Stored entanglement in atomic ensembles and verified it by converting atomic excitations back into photons.

Main Results:

  • Successfully demonstrated entanglement swapping with storage and retrieval of light using atomic ensembles.
  • Verified the entanglement between the atomic ensembles.
  • Developed a phase-insensitive method crucial for quantum repeater implementation.

Conclusions:

  • The study presents a significant advancement towards realizing practical quantum repeaters.
  • The demonstrated technique integrates atomic quantum memories with photonic qubits, essential for extending quantum communication distances.
  • This work paves the way for robust, long-distance quantum communication networks.