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Entanglement between two spatially separated atomic modes.

Karsten Lange1, Jan Peise1, Bernd Lücke1

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Researchers created entanglement between two separate ultracold atom clouds. This advance in quantum entanglement for identical particles opens new possibilities for quantum information applications and technologies.

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Atomic physics

Background:

  • Quantum technologies require large ensembles of entangled particles.
  • Entanglement in ultracold neutral atoms has been achieved for thousands of particles.
  • Entanglement in identical particles lacks clearly definable subsystems.

Purpose of the Study:

  • To generate entanglement between two spatially separated clouds of ultracold identical particles.
  • To enable the use of entangled states of indistinguishable particles for quantum information applications.

Main Methods:

  • Prepared an ensemble of ultracold identical particles in a twin Fock state.
  • Split the ensemble into two spatially separated clouds.
  • Utilized particle-exchange symmetry inherent in identical particles.

Main Results:

  • Successfully generated entanglement between the two separated clouds.
  • Demonstrated control over entangled states of indistinguishable particles.
  • Showcased the ability to address the separated clouds individually.

Conclusions:

  • The experiment provides a novel method for generating entanglement between distinct subsystems of identical particles.
  • This work paves the way for exploiting entanglement in indistinguishable particles for quantum computing, simulation, and metrology.