H
Howard Barnum
Researcher at University of New Mexico
Publications - 111
Citations - 7077
Howard Barnum is an academic researcher from University of New Mexico. The author has contributed to research in topics: Quantum information & Quantum entanglement. The author has an hindex of 41, co-authored 109 publications receiving 6510 citations. Previous affiliations of Howard Barnum include Hampshire College & University of Copenhagen.
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Noncommuting Mixed States Cannot Be Broadcast
TL;DR: It is shown that, given a general mixed state for a quantum system, there are no physical means for broadcasting that state onto two separate quantum systems, even when the state need only be reproduced marginally on the separate systems.
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Information transmission through a noisy quantum channel
TL;DR: It is shown that different applications may result in different channel capacities, and upper bounds on several of these capacities are proved based on the coherent information, which plays a role in quantum information theory analogous to that played by the mutual information in classical information theory.
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Generalized no-broadcasting theorem.
TL;DR: A generalized version of the no-broadcasting theorem is proved, applicable to essentially any nonclassical finite-dimensional probabilistic model satisfying a no-signaling criterion, including ones with "superquantum" correlations.
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Reversing quantum dynamics with near-optimal quantum and classical fidelity
Howard Barnum,Emanuel Knill +1 more
TL;DR: In this article, the authors consider the problem of reversing quantum dynamics, with the goal of preserving an initial state's quantum entanglement or classical correlation with a reference system, and exhibit an approximate reversal operation, adapted to the initial density operator and the "noise" dynamics to be reversed.
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A subsystem-independent generalization of entanglement
TL;DR: In this article, a generalization of entanglement based on the notion of a distinguished subspace of observables rather than a distinguished subsystem decomposition is presented. But it does not address how to measure and classify multipartite entanglements.