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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 |
Related resource: | http://dx.doi.org/10.1103/PhysRevLett.85.5230 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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189684.pdf | 87.77 kB | Adobe PDF | View/Open |
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