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 mu s in the absence of decoherence control to 30 mu s in the presence of a two-flip dynamical decoupling sequence.