Calibration method and apparatus for qubit gate, electronic device, and medium

An electronic device, comprising a memory and a processor, the memory having a computer program stored therein that, when executed by the processor, causes the electronic device to implement a method for calibrating a plurality of qubit gates in a quantum chip including:

• selecting, among the plurality of qubit gates for processing a qubit, a first qubit gate that has a highest initial fidelity, wherein the fidelity of a qubit gate is defined as a difference between an actual gate operation result when a predefined operation associated with the qubit gate is performed on the quit in an environment affected by noise interference and a theoretical gate operation result when the predefined operation associated with the qubit gate is performed on the quit in an environment without noise interference:
• calibrating the first qubit gate by adjusting one or more of an amplitude, a frequency, and a phase of a first radio frequency signal of a first qubit processed by the first qubit gate;
• obtaining a first fidelity of the first qubit gate for processing the qubit;
• determining a first fidelity interval including the first fidelity from a plurality of preset fidelity intervals;
• determining a target second qubit gate from the plurality of qubit gates based on the first qubit gate and the first fidelity interval and a pre-stored first mapping relationship set, the first mapping relationship set comprising a first mapping relationship between a plurality of first elements and a plurality of second elements, each first element comprising a prior-calibrated qubit gate in the qubit chip and a corresponding fidelity interval in which a fidelity of the prior-calibrated qubit gate are located and a second element corresponding to the first element comprising a target qubit gate in the qubit chip to be calibrated after calibrating the prior-calibrated qubit gate;
• determining a first calibration means from a plurality of first candidate calibration means based on the first qubit gate and the first fidelity interval and a pre-stored second mapping relationship set, the second mapping relationship set comprising a second mapping relationship between the plurality of the first elements and a plurality of third elements, each first element comprising the prior-calibrated qubit gate in the qubit chip and the corresponding fidelity interval in which the fidelity of the prior-calibrated qubit gate are located and a third element corresponding to the first element comprising a plurality of calibration means for calibrating the target qubit gate in the qubit chip after calibrating the prior-calibrated qubit gate;
• and
• determining the target second qubit gate as the first qubit gate and repeating the said calibrating, obtaining and determining steps until the fidelities of the plurality of qubit gates are all greater than or equal to a pre-determined fidelity value.

A non-transitory computer-readable storage medium, having a computer program stored therein, the computer program, when executed by a processor of an electronic device, causing the electronic device to implement a method for calibrating a plurality of qubit gates in a quantum chip including:

• selecting, among the plurality of qubit gates for processing a qubit, a first qubit gate that has a highest initial fidelity, wherein the fidelity of a qubit gate is defined as a difference between an actual gate operation result when a predefined operation associated with the qubit gate is performed on the quit in an environment affected by noise interference and a theoretical gate operation result when the predefined operation associated with the qubit gate is performed on the quit in an environment without noise interference;
• calibrating the first qubit gate by adjusting one or more of an amplitude, a frequency, and a phase of a first radio frequency signal of a first qubit processed by the first qubit gate;
• obtaining a first fidelity of the first qubit gate for processing the qubit;
• determining a first fidelity interval including the first fidelity from a plurality of preset fidelity intervals;
• determining a target second qubit gate from the plurality of qubit gates based on the first qubit gate and the first fidelity interval and a pre-stored first mapping relationship set, the first mapping relationship set comprising a first mapping relationship between a plurality of first elements and a plurality of second elements, each first element comprising a prior-calibrated qubit gate in the qubit chip and a corresponding fidelity interval in which a fidelity of the prior-calibrated qubit gate are located and a second element corresponding to the first element comprising a target qubit gate in the qubit chip to be calibrated after calibrating the prior-calibrated qubit gate;
• determining a first calibration means from a plurality of first candidate calibration means based on the first qubit gate and the first fidelity interval and a pre-stored second mapping relationship set, the second mapping relationship set comprising a second mapping relationship between the plurality of the first elements and a plurality of third elements, each first element comprising the prior-calibrated qubit gate in the qubit chip and the corresponding fidelity interval in which the fidelity of the prior-calibrated qubit gate are located and a third element corresponding to the first element comprising a plurality of calibration means for calibrating the target qubit gate in the qubit chip after calibrating the prior-calibrated qubit gate;
• and
• determining the target second qubit gate as the first qubit gate and repeating the said calibrating, obtaining and determining steps until the fidelities of the plurality of qubit gates are all greater than or equal to a pre-determined fidelity value.