Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12806
Title: Optimal strategies for sending information through a quantum channel
Author: Bagán, Emili (Bagán Capella)
Baig, M.
Brey Rodríguez, Antoni
Muñoz Tapia, Ramón
Tarrach, R., 1948-
Keywords: Teoria quàntica
Teoria de camps (Física)
Quantum theory
Field theory (Physics)
Issue Date: 2000
Publisher: American Physical Society
Abstract: Quantum states can be used to encode the information contained in a direction, i.e., in a unit vector. We present the best encoding procedure when the quantum state is made up of N spins (qubits). We find that the quality of this optimal procedure, which we quantify in terms of the fidelity, depends solely on the dimension of the encoding space. We also investigate the use of spatial rotations on a quantum state, which provide a natural and less demanding encoding. In this case we prove that the fidelity is directly related to the largest zeros of the Legendre and Jacobi polynomials. We also discuss our results in terms of the information gain.
Note: Reproducció digital del document proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevLett.85.5230
It is part of: Physical Review Letters, 2000, vol. 85, núm. 24, p. 5230-5233
URI: http://hdl.handle.net/2445/12806
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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