Measurement of the Coherence of a Bose-Einstein Condensate

Autor:	Yehuda B. Band, William D. Phillips, Steven L. Rolston, Lu Deng, Edward W. Hagley, Mark Edwards, Kristian Helmerson, M R. Doery, Mikio Kozuma, Marek Trippenbach, Paul S. Julienne
Rok vydání:	1999
Předmět:	Condensed Matter::Quantum Gases Physics Diffraction Condensed Matter::Other General Physics and Astronomy Position and momentum space Coherence length law.invention Standing wave Amplitude law Quantum mechanics Quantum Bose–Einstein condensate Coherence (physics)
Zdroj:	Physical Review Letters. 83:3112-3115
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.83.3112
Popis:	We present experimental and theoretical studies of the coherence properties of a Bose-Einstein condensate (BEC) using an interference technique. Two optical standing wave pulses of duration 100 ns and separation $\ensuremath{\Delta}t$ are applied to a condensate. Each standing wave phase grating makes small copies of the condensate displaced in momentum space. The quantum mechanical amplitudes of each copy interfere, depending on $\ensuremath{\Delta}t$ and on spatial phase variations across the condensate. We find that the behavior of a trapped BEC is consistent with a uniform spatial phase. A released BEC, however, exhibits large phase variation across the condensate.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1d639b1468cc1c18266c1b8eb95a82c2 https://doi.org/10.1103/physrevlett.83.3112 Zobrazit plný text záznamu