First-Order Crosstalk Mitigation in Parallel Quantum Gates Driven With Multi-Photon Transitions
arxiv(2023)
摘要
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 ≤ 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 Mølmer-Sørensen 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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