On the robustness of entanglement in analogue gravity systems
On the robustness of entanglement in analogue gravity systems
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DOI：
10.1088/1367-2630/15/11/113016
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发表时间：
2013-11-07
影响因子：
3.3
通讯作者：
Weinfurtner, S.
中科院分区：
文献类型：
--
作者：
Bruschi, D. E.;Friis, N.;Weinfurtner, S.
我们研究了利用模拟引力系统产生量子关联准粒子的可能性。这些关联的量子性是模拟重力效应的一个关键方面，它们的存在使得经典和量子模拟重力效应之间有了明确的区分。然而，在模拟系统中，如玻色-爱因斯坦凝聚体（BEC）和浅水波，总是在非理想条件下进行的实验，特别是在非零温度下处理色散介质。分析了初始温度对类引力现象中纠缠产生的影响。我们列出了所有必要的步骤来计算准粒子模式之间产生的纠缠，我们解析推导出的最高温度的上限，在给定的模式仍然可以纠缠。我们进一步研究了增强量子关联的机制。作为一个特殊的例子，我们分析的鲁棒性的纠缠创建对热噪声在突然淬火的理想均匀的BEC，考虑到超声波色散关系。
We investigate the possibility of generating quantum-correlated quasi-particles utilizing analogue gravity systems. The quantumness of these correlations is a key aspect of analogue gravity effects and their presence allows for a clear separation between classical and quantum analogue gravity effects. However, experiments in analogue systems, such as Bose-Einstein condensates (BECs) and shallow water waves, are always conducted at non-ideal conditions, in particular, one is dealing with dispersive media at non-zero temperatures. We analyse the influence of the initial temperature on the entanglement generation in analogue gravity phenomena. We lay out all the necessary steps to calculate the entanglement generated between quasi-particle modes and we analytically derive an upper bound on the maximal temperature at which given modes can still be entangled. We further investigate a mechanism to enhance the quantum correlations. As a particular example, we analyse the robustness of the entanglement creation against thermal noise in a sudden quench of an ideally homogeneous BEC, taking into account the super-sonic dispersion relations.