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Xin-Yu Luo1, Yi-Quan Zou1, Ling-Na Wu1

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Researchers created a large-scale entangled twin-Fock condensate using quantum phase transitions. This method offers a robust way to generate useful entanglement for advanced quantum technologies.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Many-body systems

Background:

  • Many-body entanglement is crucial for quantum technologies but challenging to create and maintain.
  • Nonlinear interactions can generate entanglement but also cause degradation.
  • Controlling quantum dynamics is key to harnessing entanglement.

Purpose of the Study:

  • To demonstrate near-deterministic generation of a large-scale entangled twin-Fock condensate.
  • To leverage quantum phase transitions (QPTs) for robust entanglement creation.
  • To quantify the generated entanglement and its potential applications.

Main Methods:

  • Driving a rubidium-87 Bose-Einstein condensate through spin mixing.
  • Utilizing two consecutive quantum phase transitions (QPTs).
  • Directly observing number squeezing and collective spin length.

Main Results:

  • Generation of an entangled twin-Fock condensate with approximately 11,000 atoms.
  • Observed number squeezing of 10.7 ± 0.6 decibels.
  • Measured normalized collective spin length of 0.99 ± 0.01.
  • Inferred entanglement-enhanced phase sensitivity beyond the standard quantum limit (~6 dB).
  • Determined an entanglement breadth of approximately 910 atoms.

Conclusions:

  • Quantum phase transitions provide a powerful tool for generating large-scale, useful entanglement.
  • The demonstrated method offers a pathway to overcome entanglement degradation.
  • This work advances the creation of entangled states for quantum sensing and computation.