A doubled q-Fock space is constructed by introducing an idle mode system dual to the physical one under consideration. The quantum entanglements of photons in the squeezed states and thermal states based on the doubled q-Fock space are discussed.
@article{arxiv.quant-ph/0103024,
title = {Quantum Entanglement of Photons in Doubled q-Fock Space},
author = {He-Shan Song and Dong Mi and Ling Zhou and Chong Li},
journal= {arXiv preprint arXiv:quant-ph/0103024},
year = {2009}
}