Selective distillation phenomenon in two-species Bose-Einstein condensates in open boundary optical lattices

TL;DR

This paper studies how two-species Bose-Einstein condensates form discrete breathers and exhibit selective distillation in open boundary optical lattices, revealing control over species composition for quantum information applications.

Contribution

It introduces the phenomenon of selective distillation in two-species BECs and demonstrates control over species dominance via intra- and interspecies interactions.

Findings

Existence of pure and symbiotic discrete breathers in two-species BECs.

Selective distillation allows control over species composition.

Potential applications in quantum information storage.

Abstract

We investigate the formation of discrete breathers (DBs) and the dynamics of the mixture of two-species Bose-Einstein condensates (BECs) in open boundary optical lattices using the discrete nonlinear Schr\"{o}dinger equations. The results show that the coupling of intra- and interspecies interaction can lead to the existence of pure single-species DBs and symbiotic DBs (i.e., two-species DBs). Furthermore, we find that there is a selective distillation phenomenon in the dynamics of the mixture of two-species BECs. One can selectively distil one species from the mixture of two-species BECs and can even control dominant species fraction by adjusting the intra- and interspecies interaction in optical lattices. Our selective distillation mechanism may find potential application in quantum information storage and quantum information processing based on multi-species atoms.