Abstract
We report measurements of particle number correlations and fluctuations of a photon Bose-Einstein condensate in a dye microcavity using a Hanbury Brown-Twiss experiment. The photon gas is coupled to a reservoir of molecular excitations, which serve as both heat bath and particle reservoir to realize grand-canonical conditions. For large reservoirs, we observe strong number fluctuations of the order of the total particle number extending deep into the condensed phase. Our results demonstrate that Bose-Einstein condensation under grand-canonical ensemble conditions does not imply second-order coherence.
Original language | English |
---|---|
Article number | 030401 |
Journal | Physical review letters |
Volume | 112 |
Issue number | 3 |
DOIs | |
Publication status | Published - 21 Jan 2014 |
Externally published | Yes |
Keywords
- n/a OA procedure