Generating maximally-path-entangled number states in two spin ensembles coupled to a superconducting flux qubit
Yusef Maleki, Aleksei M. Zheltikov
DOI 10.1103/PhysRevA.97.012312 · Physical Review A
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Abstract
An ensemble of nitrogen-vacancy (NV) centers coupled to a circuit QED device is shown to enable an efficient, high-fidelity generation of high-N00N states. Instead of first creating entanglement and then increasing the number of entangled particles N, our source of high-N00N states first prepares a high-N Fock state in one of the NV ensembles and then entangles it to the rest of the system. With such a strategy, high-N N00N states can be generated in just a few operational steps with an extraordinary fidelity. Once prepared, such a state can be stored over a longer period of time due to the remarkably long coherence time of NV centers.
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