Continuous-variable dense coding via a general Gaussian state: Monogamy relation uri icon

abstract

  • We study a continuous-variable dense coding protocol, originally proposed to employ a two-mode squeezed state, using a general two-mode Gaussian state as a quantum channel. We particularly obtain conditions to manifest quantum advantage by beating two well-known single-mode schemes, namely, the squeezed-state scheme (best Gaussian scheme) and the number-state scheme (optimal scheme achieving the Holevo bound). We then extend our study to a multipartite Gaussian state and investigate the monogamy of operational entanglement measured by the communication capacity under the dense coding protocol. We show that this operational entanglement represents a strict monogamy relation, by means of Heisenberg's uncertainty principle among different parties; i.e., the quantum advantage for communication can be possible for only one pair of two-mode systems among many parties. 2014 American Physical Society.

published proceedings

  • PHYSICAL REVIEW A

altmetric score

  • 0.25

author list (cited authors)

  • Lee, J., Ji, S., Park, J., & Nha, H.

citation count

  • 6

complete list of authors

  • Lee, Jaehak||Ji, Se-Wan||Park, Jiyong||Nha, Hyunchul

publication date

  • August 2014