Entanglement and nonclassicality of photon-added two-mode squeezed thermal state
arXiv:1203.0595 · doi:10.1364/JOSAB.29.001456
Abstract
We introduce a kind of entangled state---photon-addition two-mode squeezed thermal state (TMSTS) by adding photons to each mode of the TMSTS. Using the P-representation of thermal state, the compact expression of the normalization factor is derived, a Jacobi polynomial. The nonclassicality is investigated by exploring especially the negativity of Wigner function. The entanglement is discussed by using Shchukin-Vogel criteria. It is shown that the photon-addtion to the TMSTS may be more effective for the entanglement enhancement than the photon-subtraction from the TMSTS. In addition, the quantum teleportation is also examined, which shows that symmetrical photon-added TMSTS may be more useful for quantum teleportation than the non-symmetric case.
11 pages, 7 figures
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- Hierarchies of multipartite entanglement for continuous-variable states
- Non-Gaussian two mode squeezed thermal states in continuous variable quantum teleportation
- Improving entanglement of even entangled coherent states by a coherent superposition of photon subtraction and addition