TY - JOUR AU - David Hume AU - David Leibrandt C2 - Physical Review Letters DA - 2016-03-30 DO - https://doi.org/10.1103/PhysRevA.93.032138 LA - en M1 - A 93 PB - Physical Review Letters PY - 2016 TI - Probing beyond the laser coherence time in optical clock comparisons ER -