Dressed-state Generation for Virtual Memories toward Hybrid Quantum Sensing. (arXiv:1707.04702v3 [quant-ph] UPDATED)

Paramagnetic centres in a solid hold promise in future sensing applications.
Numerous sensing applications have been theoretically and experimentally
demonstrated. However, sensitivity improvements remain challenging. One
approach to overcome this is hybrid quantum sensing with quantum memories. We
propose hybrid quantum sensing with virtual quantum memories using dressed
states. We also observe the generation of more than four dressed states in a
single paramagnetic centre based on Autler-Townes splitting (ATS) and
demonstrate the extension of the coherence time to $T_2 \sim$ 1.5 ms for
dressed states, which is more than two orders of magnitude longer than that of
the undressed spin. Furthermore, we theoretically estimate the enhancement of
sensitivity by more than an order of magnitude compared with that without
memory. The results and our approach will pave the way for new hybrid quantum

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