Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition Academic Article uri icon

abstract

  • We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation ta+ra † of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.82.053812 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the Einstein-Podolsky-Rosen- type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction a and the addition a † particularly in the small-squeezing regime, whereas the optimal operation becomes the photon subtraction (case of r=0) in the large-squeezing regime. © 2011 American Physical Society.

published proceedings

  • Physical Review A

altmetric score

  • 1

author list (cited authors)

  • Lee, S., Ji, S., Kim, H., & Nha, H.

citation count

  • 123

complete list of authors

  • Lee, Su-Yong||Ji, Se-Wan||Kim, Ho-Joon||Nha, Hyunchul

publication date

  • July 2011