title: Scalable fabrication of high purity diamond nanocrystals with long-spin-coherence nitrogen vacancy centers.
abstract: The combination of long spin coherence time and nanoscale size has made nitrogen vacancy (NV) centers in nanodiamonds the subject of much interest for quantum information and sensing applications. However, currently available high-pressure high-temperature (HPHT) nanodiamonds have a high concentration of paramagnetic impurities that limit their spin coherence time to the order of microseconds, less than 1% of that observed in bulk diamond. In this work, we use a porous metal mask and a reactive ion etching process to fabricate nanocrystals from high-purity chemical vapor deposition (CVD) diamond. We show that NV centers in these CVD nanodiamonds exhibit record-long spin coherence times in excess of 200 μs, enabling magnetic field sensitivities of 290 nT Hz(-1/2) with the spatial resolution characteristic of a 50 nm diameter probe.
authors.affiliation: Department of Electrical Engineering and Computer Science, MIT , Cambridge, Massachusetts 02139, United States.
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Trusheim
authors.forename: Luozhou
authors.initials: L
authors.lastname: Li
authors.forename: Abdelghani
authors.initials: A
authors.lastname: Laraoui
authors.forename: Edward H
authors.initials: EH
authors.lastname: Chen
authors.forename: Hassaram
authors.initials: H
authors.lastname: Bakhru
authors.forename: Tim
authors.initials: T
authors.lastname: Schröder
authors.forename: Ophir
authors.initials: O
authors.lastname: Gaathon
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Meriles
authors.forename: Dirk
authors.initials: D
authors.lastname: Englund