Abstract
This paper presents a shortcut to adiabaticity for ramps of the interparticle interaction strength of a Bose-Einstein condensate in the Thomas-Fermi regime. The authors show how the method can be used to increase the power and efficiency of a Feshbach engine.
Highlights
Understanding and exploring concepts in quantum thermodynamics is currently a highly active topic with implications for the future development of quantum technologies [1]
Similar to classical thermodynamical engines, quantum engines will achieve maximum efficiency if they are run without creating irreversible work
II we introduce a scaling ansatz to derive an interaction ramp for a harmonically trapped d-dimensional Bose-Einstein condensates (BECs) in the Thomas-Fermi limit which ensures that the system follows an adiabatic path at all times
Summary
Understanding and exploring concepts in quantum thermodynamics is currently a highly active topic with implications for the future development of quantum technologies [1]. While applying STA protocols to drive interactions is not a trivial task, Li et al showed that it is possible in the case of a bright solitonic BEC which can be frictionlessly compressed and expanded using designed Feshbach pulses [4] Even though this can lead to an efficient Otto cycle, the operational range of the engine was very limited due to the possibility of BEC collapse in the presence of driven attractive interactions [21,22]. It is interesting to extend the idea of the Feshbach engine to BECs in the stable Thomas-Fermi regime of large particle numbers and strong repulsive interactions [23] For this we derive in this work an interaction ramp that allows for the frictionless compression and expansion of such a ThomasFermi BEC in an almost arbitrarily short time and show that these ramps can act as STAs in a Feshbach engine.
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