"NOISELESS QUANTUM INFORMATION PROCESSING"
Relatore: Dr Paolo Zanardi
ISI - Institute for Scientific Interchange - Torino
12 Febbraio 2002 - Ore 15.30
Stabilizing quantum-information processing against
the environmental interactions as well as operation
imperfections is a vital goal for any practical application
of the protocols of Quantum Information and Quantum
Computation theory. We show how all the stabilizing
schemes developed to the date derive conceptually from
a unified dynamical-algebraic framework.
Such a framework allows to build systematically new
classes of error correcting codes and noiseless subsystems.
When the required symmetries are non present one can in
principle - by using symmetrization techniques -
artificially produce noiseless subsystems.
These noiseless sectors are shown to support universal
quantum computation and to be robust against perturbations.
We shall discuss the general theory of such "Noiseless
Quantum Codes" and its application to quantum information-
encoding in realistic semiconductor-based nanostructures.