title: Suppression of spin-bath dynamics for improved coherence of multi-spin-qubit             systems.
abstract: Multi-qubit systems are crucial for the advancement and application of quantum                 science. Such systems require maintaining long coherence times while increasing the                 number of qubits available for coherent manipulation. For solid-state spin systems,                 qubit coherence is closely related to fundamental questions of many-body spin                 dynamics. Here we apply a coherent spectroscopic technique to characterize the                 dynamics of the composite solid-state spin environment of nitrogen-vacancy colour                 centres in room temperature diamond. We identify a possible new mechanism in diamond                 for suppression of electronic spin-bath dynamics in the presence of a nuclear spin                 bath of sufficient concentration. This suppression enhances the efficacy of                 dynamical decoupling techniques, resulting in increased coherence times for                 multi-spin-qubit systems, thus paving the way for applications in quantum                 information, sensing and metrology.
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA. nbar-gill@cfa.harvard.edu
authors.forename: N
authors.initials: N
authors.lastname: Bar-Gill
authors.forename: L M
authors.initials: LM
authors.lastname: Pham
authors.forename: C
authors.initials: C
authors.lastname: Belthangady
authors.forename: D
authors.initials: D
authors.lastname: Le Sage
authors.forename: P
authors.initials: P
authors.lastname: Cappellaro
authors.forename: J R
authors.initials: JR
authors.lastname: Maze
authors.forename: M D
authors.initials: MD
authors.lastname: Lukin
authors.forename: A
authors.initials: A
authors.lastname: Yacoby
authors.forename: R
authors.initials: R
authors.lastname: Walsworth