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, non-interacting particles, we assume a
time-dependent tuning of the inter-particle 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 out-of-equilibrium excitations in the system. We also quantify
the entanglement of the two-particle 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 two-atom problem in
ultracold atomic physics, the presented shortcut can be expected to have
significant impact on many processes that rely on inter-particle interactions.
