Synthesizing a $\hat{\sigma}_z$ spin-dependent force for optical, metastable, and ground state trapped-ion qubits

• URL: http://arxiv.org/abs/2207.11193v2
• Date: Thu, 1 Dec 2022 09:39:19 GMT
• Title: Synthesizing a $\hat{\sigma}_z$ spin-dependent force for optical, metastable, and ground state trapped-ion qubits
• Authors: O. B\u{a}z\u{a}van, S. Saner, M. Minder, A. C. Hughes, R. T. Sutherland, D. M. Lucas, R. Srinivas, C. J. Ballance
• Abstract summary: A single bichromatic field near-resonant to a qubit transition is typically used for $hatsigma_x$ or $hatsigma_y$ Molmer-Sorensen type interactions in trapped ion systems. It is also possible to synthesize a $hatsigma_z$ spin-dependent force by merely adjusting the beat-note frequency.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: A single bichromatic field near-resonant to a qubit transition is typically used for $\hat{\sigma}_x$ or $\hat{\sigma}_y$ M{\o}lmer-S{\o}rensen type interactions in trapped ion systems. Using this field configuration, it is also possible to synthesize a $\hat{\sigma}_z$ 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 $^{88}$Sr$^+$. Further, we characterise its robustness to optical phase and qubit frequency offsets, and demonstrate its versatility by entangling optical, metastable, and ground state qubits.

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