Quantum process tomography of a M{\o}lmer-S{\o}rensen gate via a global
beam
- URL: http://arxiv.org/abs/2101.04648v2
- Date: Tue, 20 Apr 2021 13:05:04 GMT
- Title: Quantum process tomography of a M{\o}lmer-S{\o}rensen gate via a global
beam
- Authors: Holly N Tinkey, Adam M Meier, Craig R Clark, Christopher M Seck, and
Kenton R Brown
- Abstract summary: Tomographic analysis of identity and delay processes reveals dominant error contributions from laser decoherence and slow qubit frequency drift.
We use this framework on two co-trapped $40$Ca$+$ ions to analyze both an optimized and an overpowered Molmer-Sorensen gate.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We present a framework for quantum process tomography of two-ion interactions
that leverages modulations of the trapping potential and composite pulses from
a global laser beam to achieve individual-ion addressing. Tomographic analysis
of identity and delay processes reveals dominant error contributions from laser
decoherence and slow qubit frequency drift during the tomography experiment. We
use this framework on two co-trapped $^{40}$Ca$^+$ ions to analyze both an
optimized and an overpowered M{\o}lmer-S{\o}rensen gate and to compare the
results of this analysis to a less informative Bell-state tomography
measurement and to predictions based on a simplified noise model. These results
show that the technique is effective for the characterization of two-ion
quantum processes and for the extraction of meaningful information about the
errors present in the system. The experimental convenience of this method will
allow for more widespread use of process tomography for characterizing
entangling gates in trapped-ion systems.
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