TY - JOUR AU - Brewer, Samuel AU - Chen, Jwo-Sy AU - Hankin, Aaron AU - Clements, Ethan AU - Chou, Chin-Wen AU - Wineland, David AU - Hume, David AU - Leibrandt, David C2 - Physical Review Letters DA - 2019-07-15 04:07:00 LA - en PB - Physical Review Letters PY - 2019 TI - An 27Al+ quantum-logic clock with systematic uncertainty below 10-18 UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927399 ER -