TY - JOUR AU - E. Kessler AU - P Kómár AU - M. Bishof AU - L. Jiang AU - A. Sørensen AU - Jun Ye AU - M. Lukin BT - Physical Review Letters DA - 2015-04 DO - 10.1103/PhysRevLett.112.190403 PY - 2014 EP - 190403 T2 - Physical Review Letters TI - Heisenberg-Limited Atom Clocks Based on Entangled Qubits UR - http://link.aps.org/doi/10.1103/PhysRevLett.112.190403 VL - 112 SN - 0031-9007 ER -