Pham, LinhBar-Gill, N.Belthangady, ChinmayLe Sage, DavidCappellaro, P.Lukin, MikhailYacoby, AmirWalsworth, Ronald2014-03-062012Pham, L. M., N. Bar-Gill, C. Belthangady, D. Le Sage, P. Cappellaro, M. D. Lukin, A. Yacoby, and R. L. Walsworth. 2012. “Enhanced Solid-State Multispin Metrology Using Dynamical Decoupling.” Phys. Rev. B 86 (4) (July): 045214.1098-0121http://nrs.harvard.edu/urn-3:HUL.InstRepos:11870339We use multipulse dynamical decoupling to increase the coherence lifetime (T2) of large numbers of nitrogen-vacancy (NV) electronic spins in room temperature diamond, thus enabling scalable applications of multispin quantum information processing and metrology. We realize an order-of-magnitude extension of the NV multispin T2 in three diamond samples with widely differing spin impurity environments. In particular, for samples with nitrogen impurity concentration ≲1 ppm, we extend T2 to >2 ms, comparable to the longest coherence time reported for single NV centers, and demonstrate a tenfold enhancement in NV multispin sensing of ac magnetic fields.en-USJournal Article2014-02-24Mikhail Lukin2014-03-0610.1103/physrevb.86.045214