Perfect quantum privacy implies nonlocality.
Private states are those quantum states from which a perfectly secure cryptographic key can be extracted. They represent the basic unit of quantum privacy. In this work we show that all states belonging to this class violate a Bell inequality. This result establishes a connection between perfect privacy and nonlocality in the quantum domain.
Augusiak
Remigiusz
R
ICFO-Institut de Ciències Fotòniques, E-08860 Castelldefels, Barcelona, Spain.
Cavalcanti
Daniel
D
Prettico
Giuseppe
G
Acín
Antonio
A