Abrupt and gradual changes of information through the Kane solid state computer

Details Abrupt and gradual changes of information through the Kane solid state computer Abrupt and gradual changes of information through the Kane solid state computer

2009-04-29

arxiv.org/abs/0904.4706v1

Phys. Scr 82 (2010) 035004 (7pp)

Physics

Quantum Physics

Scientific paper

The susceptibility of the transformed information to the filed and system parameters is investigated for the Kane solid state computer. It has been shown, that the field polarization and the initial state of the system play the central roles on the abrupt and gradual quench of the purity and the fidelity. If the field and the initial state are in different polarizations, then the purity and the fidelity decrease abruptly, while for the common polarization the decay is gradual and smooth. For some class of initial states one can send the information without any loss. Therefore, by controlling on the devices one can increase the time of safe communication, reduce the amount of exchange information between the state and its environment and minimize the purity decrease rate.

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