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Enhanced solid-state multispin metrology using dynamical decoupling

2012; American Physical Society; Volume: 86; Issue: 4 Linguagem: Inglês

10.1103/physrevb.86.045214

1550-235X

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

Force Microscopy Techniques and Applications

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.