Heisenberg chains cannot mirror a state

Details Heisenberg chains cannot mirror a state Heisenberg chains cannot mirror a state

2008-09-02

arxiv.org/abs/0809.0356v3

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.78.052334

Faithful exchange of quantum information can in future become a key part of many computational algorithms. Some Authors suggest to use chains of mutually coupled spins as channels for quantum communication. One can divide these proposals into the groups of assisted protocols, which require some additional action from the users, and natural ones, based on the concept of state mirroring. We show that mirror is fundamentally not the feature chains of spins-1/2 coupled by the Heisenberg interaction, but without local magnetic fields. This fact has certain consequences in terms of the natural state transfer.

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