title: Suppression of Clock Shifts at Magnetic-Field-Insensitive Transitions.
abstract: We show that it is possible to significantly reduce rank 2 tensor shifts of a clock transition by operating at a judiciously chosen magnetic-field-insensitive point. In some cases shifts are almost completely eliminated making the transition an effective J=0 to J=0 candidate. This significantly improves the feasibility of a recent proposal for clock operation with large ion crystals. For such multi-ion clocks, geometric constraints and selection rules naturally divide clock operation into two categories based on the orientation of the magnetic field. We discuss the limitations imposed on each type and how calibrations might be carried out for clock operation.
authors: Center for Quantum Technologies, 3 Science Drive 2, Singapore 117543, Singapore and Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore.
authors: K J
authors: KJ
authors: Arnold
authors: Center for Quantum Technologies, 3 Science Drive 2, Singapore 117543, Singapore and Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore.
authors: M D
authors: MD
authors: Barrett