TY - JOUR
T1 - Multipartite continuous-variable solution for the Byzantine agreement problem
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2008
A1 - Neigovzen, Rodion
A1 - Rodó, Carles
A1 - Adesso, Gerardo
A1 - Sanpera, Anna
KW - Gaussian processes
KW - homodyne detection
KW - quantum cryptography
KW - quantum entanglement
VL - 77
UR - http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PLRAAN000077000006062307000001&idtype=cvips&prog=normal
ER -
TY - JOUR
T1 - Efficiency in Quantum Key Distribution Protocols with Entangled Gaussian States
JF - Open Systems & Information Dynamics
Y1 - 2007
A1 - Rodó, Carles
A1 - Romero-Isart, Oriol
A1 - Eckert, Kai
A1 - Sanpera, Anna
KW - gaussian states
KW - quantum cryptography
KW - quantum key distribution
AB - Abstract Quantum key distribution (QKD) refers to specific quantum strategies which permit the secure distribution of a secret key between two parties that wish to communicate secretly. Quantum cryptography has proven unconditionally secure in ideal scenarios and has been successfully implemented using quantum states with finite (discrete) as well as infinite (continuous) degrees of freedom. Here, we analyze the efficiency of QKD protocols that use as a resource entangled gaussian states and gaussian operations only. In this framework, it has already been shown that QKD is possible [1] but the issue of its efficiency has not been considered. We propose a figure of merit (the efficiency E) to quantify the number of classical correlated bits that can be used to distill a key from a sample of N entangled states. We relate the efficiency of the protocol to the entanglement and purity of the states shared between the parties.
VL - 14
UR - http://dx.doi.org/10.1007/s11080-007-9030-x
ER -
TY - JOUR
T1 - Secrecy properties of quantum channels
JF - Physical Review A (Atomic, Molecular, and Optical Physics)
Y1 - 2006
A1 - Acín, Antonio
A1 - Bae, J.
A1 - Bagan, Emili
A1 - Baig, Marià
A1 - Masanes, Lluís
A1 - Muñoz-Tapia, Ramon
KW - information theory
KW - protocols
KW - quantum cryptography
VL - 73
UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLRAAN000073000001012327000001&idtype=cvips&gifs=yes
ER -