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Improving the coherence properties of solid-state spin ensembles via optimized dynamical decoupling

TitleImproving the coherence properties of solid-state spin ensembles via optimized dynamical decoupling
Publication TypeBook Chapter
Year of Publication2016
AuthorsFarfurnik, D, Jarmola, A, Pham, LM, Wang, ZH, Dobrovitski, VV, Walsworth, RL, Budker, D, Bar-Gill, N
EditorStuhler, J, Shields, AJ
Book TitleQuantum Optics
Series TitleProceedings of SPIE
PublisherSpie-Int Soc Optical Engineering
ISBN Number978-1-5106-0145-1
Accession NumberWOS:000383224000010
Keywordsbath, centers, coherence, concatenated, decoherence, diamond spins, dynamical decoupling, electronic spin, magnetometry, nitrogen vacancy, nmr, NV, resolution, sequences, Time, XY8

In this work, we optimize a dynamical decoupling (DD) protocol to improve the spin coherence properties of a dense ensemble of nitrogen-vacancy (NV) centers in diamond. Using liquid nitrogen-based cooling and DD microwave pulses, we increase the transverse coherence time T-2 from similar to 0.7 ms up to similar to 30 ms. We extend previous work of single-axis (Carr-Purcell-Meiboom-Gill) DD towards the preservation of arbitrary spin states. After performing a detailed analysis of pulse and detuning errors, we compare the performance of various DD protocols. We identify that the concatenated XY8 pulse sequences serves as the optimal control scheme for preserving an arbitrary spin state. Finally, we use the concatenated sequences to demonstrate an immediate improvement of the AC magnetic sensitivity up to a factor of two at 250 kHz. For future work, similar protocols may be used to increase coherence times up to NV-NV interaction time scales, a major step toward the creation of quantum collective NV spin states.

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Nanoscale and Ultrafast