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Anti-crosstalk high-fidelity state discrimination for superconducting qubits

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arxiv 2103.08961 v1 pith:3SXL2AHG submitted 2021-03-16 quant-ph

Anti-crosstalk high-fidelity state discrimination for superconducting qubits

classification quant-ph
keywords superconductingcrosstalkmeasurementquantumqubitqubitssystemanti-crosstalk
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Measurement for qubits plays a key role in quantum computation. Current methods for classifying states of single qubit in a superconducting multi-qubit system produce fidelities lower than expected due to the existence of crosstalk, especially in case of frequency crowding. Here, We make the digital signal processing (DSP) system used in measurement into a shallow neural network and train it to be an optimal classifier to reduce the impact of crosstalk. The experiment result shows the crosstalk-induced readout error deceased by 100% after a 3-second optimization applied on the 6-qubit superconducting quantum chip.

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