Thomás Fogarty, Lewis Ruks, Jing Li, Thomas Busch
SciPost Phys. 6, 021 (2019) ·
published 8 February 2019

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We design and explore a shortcut to adiabaticity (STA) for changing the
interaction strength between two ultracold, harmonically trapped bosons.
Starting from initially uncorrelated, noninteracting particles, we assume a
timedependent tuning of the interparticle interaction through a Feshbach
resonance, such that the two particles are strongly interacting at the end of
the driving. The efficiency of the STA is then quantified by examining the
thermodynamic properties of the system, such as the irreversible work, which is
related to the outofequilibrium excitations in the system. We also quantify
the entanglement of the twoparticle state through the von Neumann entropy and
show that the entanglement produced in the STA process matches that of the
desired target state. Given the fundamental nature of the twoatom problem in
ultracold atomic physics, the presented shortcut can be expected to have
significant impact on many processes that rely on interparticle interactions.
Dr Fogarty: "We would like to thank the ref..."
in Report on Fast control of interactions in an ultracold two atom system: Managing correlations and irreversibility