Method and apparatus for crosstalk analysis of qubits, computer device, and storage medium

A crosstalk analysis apparatus for qubits, comprising a memory storing computer instructions and a processor coupled to the memory, when executing the computer instructions, the processor being configured to:

• identify a first qubit and a second qubit;
• sequentially perform spectral quantum process tomography on quantum states corresponding to the first qubit and the second qubit, to obtain a first eigenspectrum of a signal function corresponding to the first qubit and a second eigenspectrum of a signal function corresponding to the second qubit;
• synchronously perform spectral quantum process tomography on the quantum states corresponding to the first qubit and the second qubit, to obtain a third eigenspectrum of a common signal function of the first qubit and the second qubit;
• and
• determine a crosstalk intensity between the first qubit and the second qubit based on the first eigenspectrum, the second eigenspectrum, and the third eigenspectrum.

A crosstalk analysis method for qubits, performed by a terminal, the method comprising:

• determining a first qubit and a second qubit that are to be analyzed;
• performing spectral quantum process tomography on a quantum state of the first qubit, and parsing a signal function that corresponds to the first qubit and is obtained through tomography, to obtain a first eigenspectrum, the second qubit being in a waiting state when spectral quantum process tomography is performed on the quantum state of the first qubit;
• performing spectral quantum process tomography on a quantum state of the second qubit, and parsing a signal function that corresponds to the second qubit and is obtained through tomography, to obtain a second eigenspectrum, the first qubit being in a processing state based on target gating when spectral quantum process tomography is performed on the quantum state of the second qubit;
• and
• determining a transmission line crosstalk intensity between the first qubit and the second qubit according to the first eigenspectrum and the second eigenspectrum.