@article{12054,
  author = {Liang-Ying Chih and Murray Holland},
  title = {Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate},
  abstract = {The ability to cool quantum gases into the quantum degenerate realm has opened up possibilities for an extreme level of quantum-state control. In this paper, we investigate one such control protocol that demonstrates the resonant amplification of quasimomentum pairs from a Bose-Einstein condensate by the periodic modulation of the two-body s-wave scattering length. This shows a capability to selectively amplify quantum fluctuations with a predetermined momentum, where the momentum value can be spectroscopically tuned. A classical external field that excites pairs of particles with the same energy but opposite momenta is reminiscent of the coherently-driven nonlinearity in a parametric amplifier crystal in nonlinear optics. For this reason, it may be anticipated that the evolution will generate a squeezed matter-wave state in the quasiparticle mode on resonance with the modulation frequency. Our model and analysis is motivated by a recent experiment by Clark et al. that observed a time-of-flight pattern similar to an exploding firework. Since the drive is a highly coherent process, we interpret the observed firework patterns as arising from a monotonic growth in the two-body correlation amplitude, so that the jets should contain correlated atom pairs with nearly equal and opposite momenta. We propose a potential future experiment based on applying Ramsey interferometry to experimentally probe these pair correlations.
},
  year = {2020},
  journal = {New Journal of Physics},
  volume = {22},
  chapter = {033010},
  pages = {033010},
  month = {2020-03},
  url = {https://iopscience.iop.org/article/10.1088/1367-2630/ab7140/meta},
  doi = {10.1088/1367-2630/ab7140/meta},
}