Observation of grand-canonical number statistics in a photon bose-einstein condensate

Julian Schmitt; Tobias Damm; David Dung; Frank Vewinger; Jan Klaers; Martin Weitz

doi:10.1103/PhysRevLett.112.030401

Observation of grand-canonical number statistics in a photon bose-einstein condensate

Julian Schmitt^*
, Tobias Damm
, David Dung
, Frank Vewinger
, Jan Klaers
, Martin Weitz

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

111 Citations (Scopus)

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	https://doi.org/10.1103/PhysRevLett.112.030401
Publication status	Published - 21 Jan 2014
Externally published	Yes

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10.1103/PhysRevLett.112.030401

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AU - Weitz, Martin

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AB - 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.

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Observation of grand-canonical number statistics in a photon bose-einstein condensate

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