Preservation of bipartite pseudoentanglement in solids using dynamical decoupling.

A crucial challenge for future quantum technologies is to protect fragile entanglement against environment-induced decoherence. Here we demonstrate experimentally that dynamical decoupling can preserve bipartite pseudoentanglement in phosphorous donors in a silicon system. In particular, the lifetime of pseudoentangled states is extended from 0.4  μs in the absence of decoherence control to 30  μs in the presence of a two-flip dynamical decoupling sequence.