Suppression of midcircuit measurement crosstalk errors with micromotion

Midcircuit measurement and reset are crucial primitives in quantum computation, but such operations require strong interactions with selected qubits while maintaining isolation of neighboring qubits, which is a significant challenge in many systems. For trapped ion systems, measurement is performed with laser-induced fluorescence. Stray light from the detection beam and fluorescence from the measured ions can be significant sources of decoherence for unmeasured qubits. We present a technique using ion micromotion to reduce these sources of decoherence by over an order of magnitude. We benchmark the performance with a different method, based on randomized benchmarking, to estimate the magnitude of crosstalk errors on nearby qubits. Using the Honeywell System Model H0, we demonstrate measurement and reset on select qubits with low crosstalk errors on neighboring qubits.

Automated summary

Midcircuit measurement and reset are crucial in quantum computation, but maintaining isolation of neighboring qubits while interacting with selected qubits poses a significant challenge. This study presents a technique using ion micromotion to reduce sources of decoherence significantly in trapped ion systems, demonstrating low crosstalk errors on nearby qubits during measurement and reset on select qubits using the Honeywell System Model H0.