电路QED中双模光子聚束效应的量子临界性
Two Mode Photon Bunching Effect as Witness of Quantum Criticality in Circuit QED
摘要：
我们提出了一个利用两个光子模同时耦合到临界系统的量子关联来探测量子相变（QPT）中的临界现象的方案。作为一种实验上可实现的物理实现，电路QED系统由电容耦合的约瑟夫森结量子比特阵列与超导传输线谐振器（TLR）相互作用形成。它实现了一个伊辛链在横向场（ICTF）的相互作用的两个磁模在TLR中传播。我们证明，在临界附近，原本独立的场由于与ICTF的相互作用而倾向于显示光子聚束效应。因此，量子点的发生可以通过光子场的量子特性来反映。
英文摘要：
We suggest a scheme to probe critical phenomena at a quantum phase transition (QPT) using the quantum correlation of two photonic modes simultaneously coupled to a critical system. As an experimentally accessible physical implementation, a circuit QED system is formed by a capacitively coupled Josephson junction qubit array interacting with one superconducting transmission line resonator (TLR). It realizes an Ising chain in the transverse field (ICTF) which interacts with the two magnetic modes propagating in the TLR. We demonstrate that in the vicinity of criticality the originally independent fields tend to display photon bunching effects due to their interaction with the ICTF. Thus, the occurrence of the QPT is reflected by the quantum characteristics of the photonic fields.
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