2014/05/31 by Takashi Yamamoto, T. Yamamoto, Shinobu Onoda +32
Chemistry · Earth and Planetary Sciences · Engineering · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Atomic physics #Chemistry #Coherence (philosophical gambling strategy) #Coherence time #Condensed matter physics #Diamond #Diamond and Carbon-based Materials Research #Electron paramagnetic resonance #High-pressure geophysics and materials #Impurity #Ion #Materials science #Metal and Thin Film Mechanics #Nitrogen #Nuclear magnetic resonance #Physics #Quantum #Quantum decoherence #Quantum mechanics #Qubit #Spin (aerodynamics) #Spins #Vacancy defect #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.90.081117
published as Phys. Rev. B 90, 081117 (2014)
openalex publication_date 2014/08/29 · arxiv created 2014/09/03 · arxiv updated 2014/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Nitrogen impurities help to stabilize the negatively-charged-state of NV^\ensuremath- in diamond, whereas magnetic fluctuations from nitrogen spins lead to decoherence of NV^\ensuremath- qubits. It is not known what donor concentration optimizes these conflicting requirements. Here we used 10-MeV 15N3+ ion implantation to create NV^\ensuremath- in ultrapure diamond. Optically detected magnetic resonance of single centers revealed a high creation yield of 40\ifmmode±\else\textpm\fi3% from 15N3+ ions and an additional yield of 56\ifmmode±\else\textpm\fi3% from 14N impurities. High-temperature anneal was used to reduce residual defects, and charge stable NV^\ensuremath-, even in a dilute 14N impurity concentration of 0.06 ppb were created with long coherence times.