First-Order Crosstalk Mitigation in Parallel Quantum Gates Driven With Multi-Photon Transitions

• URL: http://arxiv.org/abs/2309.15342v1
• Date: Wed, 27 Sep 2023 01:15:45 GMT
• Title: First-Order Crosstalk Mitigation in Parallel Quantum Gates Driven With Multi-Photon Transitions
• Authors: Matthew N. H. Chow, Christopher G. Yale, Ashlyn D. Burch, Megan Ivory, Daniel S. Lobser, Melissa C. Revelle, and Susan M. Clark
• Abstract summary: We show an order of magnitude reduction in the sensitivity to optical crosstalk for neighboring trapped-ion qubits during simultaneous single-qubit gates driven with individual addressing beams. Gates are implemented via two-photon Raman transitions, where crosstalk is mitigated by offsetting the drive for each qubit to avoid first-order crosstalk effects from inter-beam two-photon resonance.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We demonstrate an order of magnitude reduction in the sensitivity to optical crosstalk for neighboring trapped-ion qubits during simultaneous single-qubit gates driven with individual addressing beams. Gates are implemented via two-photon Raman transitions, where crosstalk is mitigated by offsetting the drive frequencies for each qubit to avoid first-order crosstalk effects from inter-beam two-photon resonance. The technique is simple to implement, and we find that phase-dependent crosstalk due to optical interference is reduced on the most impacted neighbor from a maximal fractional rotation error of 0.185(4) without crosstalk mitigation to $\leq$ 0.006 with the mitigation strategy. Further, we characterize first-order crosstalk in the two-qubit gate and avoid the resulting rotation errors for the arbitrary-axis M{\o}lmer-S{\o}rensen gate via a phase-agnostic composite gate. Finally, we demonstrate holistic system performance by constructing a composite CNOT gate using the improved single-qubit gates and phase-agnostic two-qubit gate. This work is done on the Quantum Scientific Computing Open User Testbed (QSCOUT); however, our methods are widely applicable for individual-addressing Raman gates and impose no significant overhead, enabling immediate improvement for quantum processors that incorporate this technique.

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