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Locality and information transfer in quantum operations
Benjamin Schumacher, Michael D. Westmoreland
We investigate the situation in which no information can be transferred from a quantum system B to a quantum system A, even though both interact with a common system C.
Approximate quantum error correction
Benjamin Schumacher, Michael D. Westmoreland
The errors that arise in a quantum channel can be corrected perfectly if and only if the channel does not decrease the coherent information of the input state. We show that, if the…
Relative entropy in quantum information theory
Benjamin Schumacher, Michael D. Westmoreland
We review the properties of the quantum relative entropy function and discuss its application to problems of classical and quantum information transfer and to quantum data compress…
Optimal signal ensembles
Benjamin Schumacher, Michael D. Westmoreland
Classical messages can be sent via a noisy quantum channel in various ways, corresponding to various choices of signal states of the channel. Previous work by Holevo and by Schumac…
Reversibility of local transformations of multiparticle entanglement
N. Linden, S. Popescu, B. Schumacher +1
We consider the transformation of multisystem entangled states by local quantum operations and classical communication. We show that, for any reversible transformation, the relativ…
Quantum Entanglement and the Nonexistence of Superluminal Signals
Michael D. Westmoreland, Benjamin Schumacher
This paper shows that ordinary quantum mechanics is not consistent with the superluminal transmission of classical information.