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21 papers · 1 filter
On Superselection Rules in Bohm-Bell Theories
Samuel Colin, Thomas Durt, Roderich Tumulka
The meaning of superselection rules in Bohm-Bell theories (i.e., quantum theories with particle trajectories) is different from that in orthodox quantum theory. More precisely, the…
Information processing in generalized probabilistic theories
Jonathan Barrett
I introduce a framework in which a variety of probabilistic theories can be defined, including classical and quantum theories, and many others. From two simple assumptions, a tenso…
Classicality in discrete Wigner functions
Cecilia Cormick, Ernesto F. Galvao, Daniel Gottesman +2
Gibbons et al. [Phys. Rev. A 70, 062101(2004)] have recently defined a class of discrete Wigner functions W to represent quantum states in a Hilbert space with finite dimension. We…
Entanglement in an expanding spacetime
J. L. Ball, I. Fuentes-Schuller, F. P. Schuller
We show that a dynamical spacetime generates entanglement between modes of a quantum field. Conversely, the entanglement encodes information concerning the underlying spacetime str…
Random subspaces for encryption based on a private shared Cartesian frame
Stephen D. Bartlett, Patrick Hayden, Robert W. Spekkens
A private shared Cartesian frame is a novel form of private shared correlation that allows for both private classical and quantum communication. Cryptography using a private shared…
Bell's Jump Process in Discrete Time
Jonathan Barrett, Matthew Leifer, Roderich Tumulka
The jump process introduced by J. S. Bell in 1986, for defining a quantum field theory without observers, presupposes that space is discrete whereas time is continuous. In this let…