Continuous-variable quantum-state sharing via quantum disentanglement

Lance, A. M., Symul, T., Bowen, W. P., Sanders, B. C., Tyc, T., Ralph, T. C. and Lam, P. K. (2005) Continuous-variable quantum-state sharing via quantum disentanglement. Physical Review A, 71 3: 033814-1-033814-11. doi:10.1103/PhysRevA.71.033814

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Author Lance, A. M.
Symul, T.
Bowen, W. P.
Sanders, B. C.
Tyc, T.
Ralph, T. C.
Lam, P. K.
Title Continuous-variable quantum-state sharing via quantum disentanglement
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevA.71.033814
Open Access Status File (Publisher version)
Volume 71
Issue 3
Start page 033814-1
End page 033814-11
Total pages 11
Editor Crasemann, B.
Place of publication United States
Publisher Americal Physical Society
Collection year 2005
Language eng
Subject C1
240301 Atomic and Molecular Physics
780102 Physical sciences
02 Physical Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract Quantum-state sharing is a protocol where perfect reconstruction of quantum states is achieved with incomplete or partial information in a multipartite quantum network. Quantum-state sharing allows for secure communication in a quantum network where partial information is lost or acquired by malicious parties. This protocol utilizes entanglement for the secret-state distribution and a class of quantum disentangling protocols for the state reconstruction. We demonstrate a quantum-state sharing protocol in which a tripartite entangled state is used to encode and distribute a secret state to three players. Any two of these players can collaborate to reconstruct the secret state, while individual players obtain no information. We investigate a number of quantum disentangling processes and experimentally demonstrate quantum-state reconstruction using two of these protocols. We experimentally measure a fidelity, averaged over all reconstruction permutations, of F=0.73 +/- 0.02. A result achievable only by using quantum resources.
Keyword Optics
Physics, Atomic, Molecular & Chemical
References Physical Review A, 71, 033814
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 06:57:14 EST