TY - JOUR AU - Martin Gärttner AU - Justin Bohnet AU - Arghavan Safavi-Naini AU - Michael Wall AU - John Bollinger AU - Ana Maria Rey BT - Nature Physics DA - 2017-05 DO - 10.1038/nphys4119 PY - 2017 SE - 781 SP - 781 EP - 786 T2 - Nature Physics TI - Measuring out-of-time-order correlations and multiple quantum spectra in a trapped-ion quantum magnet UR - http://www.nature.com/doifinder/10.1038/nphys4119 VL - 13739 SN - 1745-2473 ER -