On two recent proposals for witnessing nonclassical gravity
On two recent proposals for witnessing nonclassical gravity
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关于见证非经典引力的两项最新提议
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Reginatto
中科院分区：
文献类型：
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作者：
M. Hall;M. Reginatto
最近，玻色等人以及马莱托和韦德拉尔提出了两个非常相似的关于引力非经典特征的建议。然而，虽然这些建议被认为是非常普遍的，但它们实际上是基于一个非常强烈的主张：量子系统不能通过经典中介体纠缠。我们指出，为这一主张提供的支持只适用于一类非常有限的量子经典相互作用模型，对应于库普曼型动力学。我们表明，索赔也是有效的平均场模型，但它是矛盾的明确的反例的基础上的配置合奏模型。因此，这两个提议都没有提供非经典引力的确定性检验。
Two very similar proposals have been made recently for witnessing nonclassical features of gravity, by Bose et al and by Marletto and Vedral. However, while these proposals are asserted to be very general, they are in fact based on a very strong claim: that quantum systems cannot become entangled via a classical intermediary. We point out that the support provided for this claim is only applicable to a very limited class of quantum-classical interaction models, corresponding to Koopman-type dynamics. We show that the claim is also valid for mean-field models, but that it is contradicted by explicit counterexamples based on the configuration-ensemble model. Thus, neither proposal provides a definitive test of nonclassical gravity.