| Autor: |
Dall RG; ARC Centre of Excellence for Quantum Atom Optics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia., Hodgman SS, Manning AG, Johnsson MT, Baldwin KG, Truscott AG |
| Jazyk: |
angličtina |
| Zdroj: |
Nature communications [Nat Commun] 2011; Vol. 2, pp. 291. |
| DOI: |
10.1038/ncomms1292 |
| Abstrakt: |
Speckle patterns produced by multiple independent light sources are a manifestation of the coherence of the light field. Second-order correlations exhibited in phenomena such as photon bunching, termed the Hanbury Brown-Twiss effect, are a measure of quantum coherence. Here we observe for the first time atomic speckle produced by atoms transmitted through an optical waveguide, and link this to second-order correlations of the atomic arrival times. We show that multimode matter-wave guiding, which is directly analogous to multimode light guiding in optical fibres, produces a speckled transverse intensity pattern and atom bunching, whereas single-mode guiding of atoms that are output-coupled from a Bose-Einstein condensate yields a smooth intensity profile and a second-order correlation value of unity. Both first- and second-order coherence are important for applications requiring a fully coherent atomic source, such as squeezed-atom interferometry. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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