Observation of grand-canonical number statistics in a photon Bose-Einstein condensate.
Observation of grand-canonical number statistics in a photon Bose-Einstein condensate.
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DOI：
10.1103/physrevlett.112.030401
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发表时间：
2013-11
影响因子：
8.6
通讯作者：
J. Schmitt;T. Damm;D. Dung;F. Vewinger;J. Klaers;M. Weitz
中科院分区：
文献类型：
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作者：
J. Schmitt;T. Damm;D. Dung;F. Vewinger;J. Klaers;M. Weitz
我们报告了使用Hanbury Brown-Twiss实验测量染料微腔中光子玻色-爱因斯坦凝聚体的粒子数相关性和波动。光子气体与分子激发态储层耦合，既充当热浴，又充当粒子储层，实现了大正则条件。对于大型储层，我们观察到总颗粒数量级的强烈数量波动延伸到凝聚相深处。我们的结果表明，在大正则系综条件下，玻色-爱因斯坦凝聚并不意味着二阶相干。
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.