Two Mode Photon Bunching Effect as Witness of Quantum Criticality in Circuit QED

Details Two Mode Photon Bunching Effect as Witness of Quantum Criticality in Circuit QED Two Mode Photon Bunching Effect as Witness of Quantum Criticality in Circuit QED

2008-12-15

arxiv.org/abs/0812.2774v1

Science in China Series G-Physics Mechanics Astron 2009, 52(12) 1898-1905

Physics

Quantum Physics

7 pages, 4 figures

Scientific paper

10.1007/s11433-009-0274-z

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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