Chiara Marletto, Alastair Kay, Artur Ekert
In the absence of errors, the dynamics of a spin chain, with a suitably
engineered local Hamiltonian, allow the perfect, coherent transfer of a quantum
state over large distances. Here, we propose encoding and decoding procedures
to recover perfectly from low rates of systematic errors. The encoding and
decoding regions, located at opposite ends of the chain, are small compared to
the length of the chain, growing linearly with the size of the error. We also
describe how these errors can be identified, again by only acting on the
encoding and decoding regions.
View original:
http://arxiv.org/abs/1202.2978
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