Entangled photons from the polariton vacuum in a switchable optical cavity
Entangled photons from the polariton vacuum in a switchable optical cavity
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DOI：
10.1103/physrevb.85.235140
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发表时间：
2012-06-21
影响因子：
3.7
通讯作者：
Burkard, Guido
中科院分区：
文献类型：
--
作者：
Auer, Adrian;Burkard, Guido
从理论上研究了子带间腔系统基态中双光子态的纠缠，所谓的极化子真空。该系统由位于微腔中的一系列掺杂量子威尔斯阱组成，光子可以与量子威尔斯阱中的子带间激发相互作用。使用一个明确的解决方案的基态系统，在超强耦合制度，后选择的介绍，只有某些双光子态被认为是和分析模式纠缠。我们发现，一个快速淬火的耦合创建纠缠的光子和纠缠的程度取决于平面内的波矢量的光子的绝对值。在后选择过程中，通过选择合适的模式可以产生最大纠缠态。
We study theoretically the entanglement of two-photon states in the ground state of the intersubband cavity system, i.e., the so-called polariton vacuum. The system consists of a sequence of doped quantum wells located inside a microcavity and the photons can interact with intersubband excitations inside the quantum wells. Using an explicit solution for the ground state of the system, operated in the ultrastrong-coupling regime, a postselection is introduced, where only certain two-photon states are considered and analyzed for mode entanglement. We find that a fast quench of the coupling creates entangled photons and that the degree of entanglement depends on the absolute values of the in-plane wave vectors of the photons. Maximally entangled states can be generated by choosing the appropriate modes in the postselection.