4 papers
Application and quantum properties of superpositions of oppositely squeezed states
Hiroo Azuma, William J. Munro, Kae Nemoto
We show that superpositions of oppositely squeezed states -- non-Gaussian Schr{ö}dinger-cat-like states -- exhibit enhanced nonclassical features and provide an entanglement advan…
Wigner functions, negativity volumes, and experimental generation of Pegg-Barnett phase-operator eigenstates
Hiroo Azuma
In this paper, we study the non-Gaussianity of the eigenstates of the Pegg-Barnett phase observable. By computing the Wigner functions of the eigenstates, we confirm that they take…
Quantum phase transitions in the multiphoton Jaynes-Cummings-Hubbard model
Hiroo Azuma, William J. Munro, Kae Nemoto
We explore quantum phase transitions in the multiphoton Jaynes-Cummings-Hubbard model (JCHM). Using the mean-field approximation, we demonstrate that the multiphoton JCHM exhibits…
A heralded single-photon source implemented with second-order nonlinear photonic crystals
Hiroo Azuma
We study implementing a heralded single-photon source with second-order nonlinear photonic crystals. Injecting pump and signal light beams into a one-dimensional photonic crystal c…