Work

Synthesizing a σz spin-dependent force for optical, metastable, and ground-state trapped-ion qubits

Year: 2023

Type: article

Abstract: A single bichromatic field near resonant to a qubit transition is typically used for ${\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\ensuremath{\sigma}}}_{x}$ or ${\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\ensuremath{\sigma}}}_{y}$ M\o{}lmer-S\o{}rensen-type interactions in trapped-ion systems. Using this field configuration, it is also possible to synthesize a ${\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\ensuremath{\sigma}}}_{z}$ spin-dependent force by merely adjusting the beat-note frequency. Here, we expand on previous work and present a comprehensive theoretical and experimental investigation of this scheme with a laser near resonant to a quadrupole transition in $^{88}\mathrm{Sr}^{+}$. Further, we characterize its robustness to optical phase and qubit frequency offsets, and demonstrate its versatility by entangling optical, metastable, and ground-state qubits.

Source: Physical Review A

DOI: 10.1103/physreva.107.022617