On the observation of nonclassical excitations in Bose–Einstein condensates
On the observation of nonclassical excitations in Bose–Einstein condensates
复制标题
关于玻色-爱因斯坦凝聚中非经典激发的观察
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Weinfurtner
中科院分区：
文献类型：
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作者：
A. Finke;P. Jain;S. Weinfurtner
在最近的实验和理论文献中，量子光学领域中建立的非经典性准则已被直接应用于物质波中的激发。其中包括违反Cauchy-Schwarz不等式，Glauber-Sudarshan p -非经典性，亚泊松数差压缩（也称为双模方差）和不可分准则。我们回顾了这些准则之间的紧密联系及其在量子光学中的意义，并指出了光波和物质波在解释上的差异。然后，我们计算了在有限初始温度下，在量子理论和经典参考下，在相互作用参数中经历任意调制的均匀玻色-爱因斯坦凝聚的可观测值。我们得出的结论是，迄今为止，在与此情景相关的实验中，非经典效应尚未被最终观察到，并推测为此目的必须测量额外的、非交换的可观测值。此外，这对提出的模拟重力模型具有重要意义，其中观察非经典效应是一个主要目标。
In the recent experimental and theoretical literature well-established nonclassicality criteria from the field of quantum optics have been directly applied to the case of excitations in matter-waves. Among these are violations of Cauchy–Schwarz inequalities, Glauber–Sudarshan P-nonclassicality, sub-Poissonian number-difference squeezing (also known as the two-mode variance) and the criterion of nonseparability. We review the strong connection of these criteria and their meaning in quantum optics, and point out differences in the interpretation between light and matter waves. We then calculate observables for a homogeneous Bose–Einstein condensate undergoing an arbitrary modulation in the interaction parameter at finite initial temperature, within both the quantum theory as well as a classical reference. We conclude that to date in experiments relevant for this scenario nonclassical effects have not conclusively been observed and conjecture that additional, noncommuting, observables have to be measured to this end. Moreover this has important implications for proposed analog gravity models where the observation of nonclassical effects is a major goal.
影响因子：
3.3
作者：
Bruschi, D. E.;Friis, N.;Weinfurtner, S.
通讯作者：
Weinfurtner, S.