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A spinor Bose-Einstein condensate phase-sensitive amplifier for SU(1,1) interferometry.

J P Wrubel1, A Schwettmann2, D P Fahey3

  • 1Department of Physics, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, USA.

Physical Review. A
|May 17, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel atomic interferometer using Bose-Einstein condensates (BECs) to enhance phase sensitivity beyond the standard quantum limit. This new approach demonstrates potential for highly precise measurements.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum metrology

Background:

  • The SU(1,1) interferometer, a variant of the Mach-Zehnder interferometer, utilizes parametric amplifiers to achieve enhanced phase sensitivity.
  • Bose-Einstein condensates (BECs), specifically F = 1 spinor BECs, can function as atomic parametric amplifiers by generating entangled atomic pairs.

Purpose of the Study:

  • To simulate and experimentally demonstrate a spinor phase-sensitive amplifier for an atomic SU(1,1) interferometer.
  • To investigate the impact of single-sided and double-sided seeding on interferometer performance.
  • To achieve phase sensitivity beyond the standard quantum limit.

Main Methods:

  • Simulations using the truncated-Wigner approximation to model single and double-sided seeding effects.
  • Experimental realization of a spinor phase-sensitive amplifier using a 23Na BEC in an optical dipole trap.
  • Control over the initial phase of the double-seeded amplifier.

Main Results:

  • Single-sided seeding was found to degrade interferometer performance at optimal operating phases.
  • Double-sided seeding created a phase-sensitive amplifier where sensitivity depends on input state phase.
  • An optimal phase was identified for both seeding methods, enabling sensitivity beyond the standard quantum limit.
  • Experimental demonstration of sensitivity to initial population fractions as low as 0.1%.

Conclusions:

  • Spinor BECs provide a viable platform for creating phase-sensitive amplifiers for atomic interferometers.
  • Double-sided seeding offers enhanced control and phase sensitivity.
  • The demonstrated system achieves quantum-enhanced phase sensitivity, paving the way for improved measurement precision.