TY - JOUR AU - Gilmore, Kevin AU - Bohnet, Justin AU - Sawyer, Brian AU - Britton, Joseph AU - Bollinger, John C2 - Physical Review Letters DA - 2017-06-29 LA - en PB - Physical Review Letters PY - 2017 TI - Amplitude sensing below the zero-point fluctuations with a two-dimensional trapped-ion mechanical oscillator UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923013 ER -