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Scalable spin squeezing for quantum-enhanced magnetometry with Bose-Einstein condensates.

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Researchers generated large-scale entangled atomic states using Bose-Einstein condensates, achieving 5.3 dB fluctuation suppression. This quantum squeezing enables enhanced magnetometry with high sensitivity in small volumes.

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Area of Science:

  • Quantum Metrology
  • Atomic Physics
  • Condensed Matter Physics

Background:

  • Generating entangled states with large atom numbers is a key challenge in quantum metrology.
  • Bose-Einstein condensates (BECs) offer a promising platform for creating macroscopic entangled states.

Purpose of the Study:

  • To demonstrate the generation of large-scale entangled states in BECs.
  • To utilize these states for quantum-enhanced magnetometry.

Main Methods:

  • Employing nonlinear dynamics in BECs to generate atomic squeezing.
  • Utilizing specific trap geometries to scale entanglement to large atom numbers.
  • Swapping squeezed states to magnetically sensitive hyperfine levels for magnetometry.

Main Results:

  • Achieved a fluctuation suppression of 5.3(5) dB for 12,300 particles.
  • Inferred potential for similar squeezing in systems with over 10^7 atoms.
  • Demonstrated quantum-enhanced magnetometry with a single-shot sensitivity of 310(47) pT.

Conclusions:

  • Scalable generation of macroscopic entangled states is achievable in BECs.
  • Quantum-enhanced magnetometry with high sensitivity is enabled by this technique.
  • This approach opens new avenues for precision measurements in physics and beyond.