Transition behavior in the channel capacity of two-quibit channels with memory

Journal Article · Thu Jan 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.69.010303· OSTI ID:20640569

Macchiavello, Chiara ^[1]; Palma, G Massimo ^[2]; Virmani, S ^[3]

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1. Dipartimento di Fisica 'A.Volta', and Istituto Nazionale per la Fisica della Materia (INFM), Via Bassi 6, I-27100 Pavia (Italy)
2. INFM-NEST, Dipartimento di Tecnologie dell'Informazione, Universita degli Studi di Milano, via Bramante 65, I-26013 Crema, CR (Italy)
3. QOLS, Department of Physics, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BW (United Kingdom)

We prove that a general upper bound on the maximal mutual information of quantum channels is saturated in the case of Pauli channels with an arbitrary degree of memory. For a subset of such channels we explicitly identify the optimal signal states. We show analytically that for such a class of channels entangled states are indeed optimal above a given memory threshold.

• OSTI ID: 20640569
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CAPACITY
CORRELATIONS
DATA TRANSMISSION
ENERGY LEVELS
INFORMATION
INFORMATION THEORY
QUANTUM MECHANICS
SIGNALS