Quantum entanglement based on surface phonon polaritons in condensed   matter systems
  Condensed matter systems are potential candidates to realize the integration of quantum information circuits. Surface phonon polariton (SPhP) is a special propagation mode in condensed matter systems. We present an investigation on the entanglement of SPhP modes. The entangled pairs are generated from entangled photons injected to the system. Quantum performances of entangled SPhPs are investigated by using the interaction Hamiltonian and the perturbation theory. The wave mechanics approach is taken to describe the coupling process as a comparison. Finally, the correlation of system is examined. A whole set of descriptions of SPhP entanglement thus are presented. 
Yang Ming, Zi-jian Wu, Xi-kui Hu, Fei Xu and Yan-qing Lu
quant-ph cond-mat.mtrl-sci