Bidirectional transfer of quantum information for unknown photons via cross-Kerr nonlinearity and photon-number-resolving measurement
Heo Jino1, 2, Hong Chang-Ho1, 2, Lee Dong-Hoon1, 2, Yang Hyung-Jin1, 3, †,
       

Plots of the error probabilities of the C-path gates based on coherent state and X-homodyne (red line(upper)),[23] CSS and P-homodyne (black curve (middle)),[27] and the qubus beams and the QND (PNR) detection (blue curve (lower)), each as a function of θ (the XKNL’s phase shift), for probe beam amplitude α = 1000. The red (upper), black (middle), and blue (lower) plots are the functions of and respectively, as indicated in Eq. (19). For example, when θ = 0.003 and α = 1000, the error probabilities are , and .