论文标题
在经典的重力模型中，超出纠缠的量子相关性
Quantum correlations beyond entanglement in a classical-channel model of gravity
论文作者
论文摘要
已知两个质量之间的牛顿相互作用的直接量化是建立纠缠的，如果检测到的话将见证重力场的量子性质。引力相互作用尚未与依靠经典通道的重力分解模型兼容，因此无法创建纠缠。在这里，我们在范式的情况下表明，尽管没有纠缠，但经典的重力模型仍然可以以两个质量之间的量子不便的形式建立量子相关性。这是针对Kafri-Taylor-Milburn（KTM）模型和最近提出的耗散扩展的。在这两种情况下，从不相关的状态开始，通常会产生大量的不和谐。最终在KTM模型中衰减，而它在其耗散扩展中会收敛到一个小的固定值。我们还发现，对质量状态的最初局部挤压可以显着增强产生的不和谐。
A direct quantization of the Newtonian interaction between two masses is known to establish entanglement, which if detected would witness the quantum nature of the gravitational field. Gravitational interaction is yet compatible also with gravitational decoherence models relying on classical channels, hence unable to create entanglement. Here, we show in paradigmatic cases that, despite the absence of entanglement, a classical-channel model of gravity can still establish quantum correlations in the form of quantum discord between two masses. This is demonstrated for the Kafri-Taylor-Milburn (KTM) model and a recently proposed dissipative extension of this. In both cases, starting from an uncorrelated state, a significant amount of discord is generally created. This eventually decays in the KTM model, while it converges to a small stationary value in its dissipative extension. We also find that initial local squeezing on the state of the masses can significanlty enhance the generated discord.
