Research on Experimental System of Superconducting Qubits Based on Josephson Junctions
A single-chain twenty-qubit quantum chip was designed by using frequency adjustable transmon structure.We performed basic characterization experiments on all qubits using a customized low-temperature environment control system and low-temperature coaxial cable components,which have attained a maximum energy decoherence time T1 of 31.3 μs and a phase decoherence time T*2 of 22.8 μs among all qubits.An average fidelity of 99.85%for single-qubit gates was gained as determined by random benchmark testing.The two-qubit Controlled-Z gate calibration was also achieved,with a fidelity of 97.5%measured through quantum process tomography.Finally,we demonstrated a quantum dynamics simulation algorithm based on the operation of single-qubits gates and double-qubits gates,successfully observing the dynamical evolution of the Ising model.
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