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Continuous-variable dense coding via a general Gaussian state: Monogamy relation
- Source :
- Phys. Rev. A 90, 022301 (2014)
- Publication Year :
- 2014
-
Abstract
- We study a continuous variable (CV) 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.
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 90, 022301 (2014)
- Publication Type :
- Report
- Accession number :
- edsarx.1408.1153
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.90.022301