Room-temperature storage of quantum entanglement using decoherence-free subspace in a solid-state spin system

摘要

We experimentally demonstrate room-temperature storage of quantumentanglement using two nuclear spins weakly coupled to the electronic spincarried by a single nitrogen-vacancy center in diamond. We realize universalquantum gate control over the three-qubit spin system and produce entangledstates encoded within the decoherence-free subspace of the two nuclear spins.By injecting arbitrary collective noise, we demonstrate that thedecoherence-free entangled state has coherence time longer than that of otherentangled states by an order of magnitude in our experiment.