1209.0120 (Maciej Demianowicz)
Maciej Demianowicz
In this paper we consider construction of decoherence free subspaces for two--access random unitary channels. First, we concentrate on hermitian unitary noise model $U$ for a bi--unitary channel and show that in this case a code exists if the space of Schmidt matrices of an eigensubspace of $U$ exhibits certain properties of decomposability. Then, we show that our technique is also applicable in a generic case and consider its application two tri- (quatro-, ...) unitary channels.
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http://arxiv.org/abs/1209.0120
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