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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Orientation-dependent entanglement lifetime in a squeezed atomic clock.

Ian D Leroux1, Monika H Schleier-Smith, Vladan Vuletić

  • 1Department of Physics, MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Squeezed spin states enhance atomic clock precision by improving entanglement lifetime against anisotropic noise. This quantum approach achieves a given precision 2.8 times faster than standard methods.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Metrology

Background:

  • Atomic clocks are crucial for precise timekeeping.
  • Standard quantum limit restricts atomic clock precision.
  • Entangled states offer potential for surpassing classical limits.

Purpose of the Study:

  • To experimentally investigate squeezed spin states for enhanced atomic clock precision.
  • To analyze the impact of anisotropic noise on entanglement lifetime.
  • To quantify the improvement in clock performance using squeezed states.

Main Methods:

  • Utilized squeezed spin states as input for an atomic clock.
  • Measured the Allan deviation spectrum to assess clock stability.
  • Varied squeezing orientation to study its effect on entanglement lifetime and clock performance.

Main Results:

  • Entanglement lifetime is highly sensitive to squeezing orientation under anisotropic noise.
  • The squeezed atomic clock achieved a specified precision 2.8(3) times faster than a standard quantum limit clock.
  • Performance improvement was observed for averaging times up to 50 seconds.

Conclusions:

  • Squeezed spin states are a viable method for improving atomic clock precision.
  • Optimizing squeezing orientation is critical for maximizing benefits in noisy environments.
  • This quantum enhancement offers a significant speedup in achieving high-precision time measurements.