Slow sound in matter-wave dark soliton gases

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Shaukat, MI (Autor) Outra; Eduardo V Castro (Autor) FCUP; Tercas, H (Autor) Outra

Revista

Título: Physical Review B

Vol. 99

ISSN: 2469-9950

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-00Q-JAJ

DOI: 10.1103/physrevb.99.205408

Abstract (EN): We demonstrate the possibility of drastically reducing the velocity of phonons in quasi-one-dimensional Bose-Einstein condensates. Our scheme consists of a dilute dark soliton "gas" that provide the trapping for the impurities that surround the condensate. We tune the interaction between the impurities and the condensate particles in such a way that the dark solitons result in an array of qutrits (three-level structures). We compute the phonon-soliton coupling and investigate the decay rates of these three-level qutrits inside the condensate. As such, we are able to reproduce the phenomenon of acoustic transparency based purely on matter-wave phononics, in analogy with the electromagnetically induced transparency effect in quantum optics. Thanks to the unique properties of transmission and dispersion of dark solitons, we show that the speed of an acoustic pulse can be brought down to similar to 5 mu m/s, similar to 10(3) times lower than the condensate sound speed. This is a value that greatly underdoes most of the reported studies for phononic platforms. We believe the present work could pave the stage for a new generation of "stopped-sound"-based quantum information protocols.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9