Abstract

Although it is widely accepted that “no-broadcasting”—the nonclonability of quantum information—is a fundamental principle of quantum mechanics, an impossibility theorem for the broadcasting of general density matrices has not yet been formulated. In this Letter, we present a general proof for the no-broadcasting theorem, which applies to arbitrary density matrices. The proof relies on entropic considerations, and as such can also be directly linked to its classical counterpart, which applies to probabilistic distributions of statistical ensembles.

Date

May 29, 2008

Authors

Amir Kalev, Itay Hen

Journal

Physical review letters

Volume

100

Issue

21

Pages

210502

Publisher

American Physical Society