Von Neumann regular ring: Difference between revisions

Revision as of 22:15, 11 March 2013

Coherent information is an entropy measure used in quantum information theory. It is a property of a quantum state ρ and a quantum channel $𝒩$ ; intuitively, it attempts to describe how much of the quantum information in the state will remain after the state goes through the channel. In this sense, it is intuitively similar to the mutual information of classical information theory. The coherent information is written $I (ρ, 𝒩)$ .

Definition

The coherent information is defined as $I (ρ, 𝒩) \overset{d e f}{=} S (𝒩 ρ) - S (𝒩, ρ)$ where $S (𝒩 ρ)$ is the von Neumann entropy of the output and $S (𝒩, ρ)$ is the entropy exchange between the state and the channel.

History

The coherent information was introduced by Benjamin Schumacher and Michael A. Nielsen in a 1996 paper Quantum data processing and error correction, which appeared in Physical Review A.

References

Nielsen, Michael A. and Isaac L. Chuang (2000). Quantum Computation and Quantum Information, Cambridge University Press, ISBN 0-521-63503-9
Nielsen, Michael A. and Benjamin Schumacher (1996). Quantum data processing and error correction. Physical Review A., 54 (4), 2629-2635.

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+'''Coherent information''' is an [[entropy measure]] used in [[quantum information theory]].  It is a property of a [[quantum state]] ρ and a [[quantum channel]] <math>\mathcal{N}</math>; intuitively, it attempts to describe how much of the [[quantum information]] in the state will remain after the state goes through the channel.  In this sense, it is intuitively similar to the [[mutual information]] of [[classical information theory]]. The coherent information is written <math>I(\rho, \mathcal{N})</math>.
+==Definition==
+The coherent information is defined as <math>I(\rho, \mathcal{N})\ \stackrel{\mathrm{def}}{=}\ S(\mathcal{N} \rho) - S(\mathcal{N},\rho)</math> where <math> S(\mathcal{N} \rho)</math> is the [[quantum statistical mechanics#Von Neumann entropy|von Neumann entropy]] of the output and <math>S({\mathcal N},\rho)</math> is the [[entropy exchange]] between the state and the channel.
+==History==
+The coherent information was introduced by [[Benjamin Schumacher]] and [[Michael A. Nielsen]] in a 1996 paper ''Quantum data processing and error correction'', which appeared in [[Physical Review A]].
+==References==
+* Nielsen, Michael A. and [[Isaac L. Chuang]] (2000).  ''Quantum Computation and Quantum Information'', Cambridge University Press, ISBN 0-521-63503-9
+* Nielsen, Michael A. and [[Benjamin Schumacher]] (1996).  [http://arxiv.org/abs/quant-ph/9604022 Quantum data processing and error correction]. ''Physical Review A.'', '''54''' (4), 2629-2635.
+[[Category:Quantum mechanical entropy]]
+[[Category:Quantum information theory]]
+{{physics-stub}}

Von Neumann regular ring: Difference between revisions

Revision as of 22:15, 11 March 2013

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