1201.5686 (Linh My Pham et al.)

Enhanced solid-state multi-spin metrology using dynamical decoupling    [PDF]

Linh My Pham, Nir Bar-Gill, Chinmay Belthangady, David Le Sage, Paola Cappellaro, Mikhail D. Lukin, Amir Yacoby, Ronald L. Walsworth

We use multi-pulse 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 multi-spin quantum
information processing and metrology. We realize an order-of-magnitude
extension of the NV multi-spin T2 for diamond samples with widely differing
spin environments. For samples with nitrogen impurity concentration <~1 ppm, we
find T2 > 2 ms, comparable to the longest coherence time reported for single NV
centers, and demonstrate a ten-fold enhancement in NV multi-spin sensing of AC
magnetic fields.

View original: http://arxiv.org/abs/1201.5686