Matteo G A Paris Quantum Optics & Information Group Universit à di Milano qinf.fisica.unimi.it/~paris. Title. Informatica Quantistica: Introduzione. Milano, 30 Maggio 2005. Info Phys. Information is physical. Information is physical.
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Information is physical
Coding: logical bit / physical degree of freedom
(superpositions and non-orthogonality)
Transmission, manipulation: Logical gates should be unitary.
After interactions information carriers cannot be separately
described (superpositions entanglement)
Decoding: uncertainty relations and impossibility of
Information is physical:
limits to amplification
1≠0 no way to discriminate with certainty
error probability Pe = z0 P10 + z1 P01 Pij = Tr [j i]
1= >0 |>< | 0= - 1
| >= | > = z1 1 - z0
Minimum error (pure states)
Open problems (among many others)
(scalable, robust against decoherence)
Characterization of entanglement