total_search

Outline

This function calculates the number of qubits required on the quantum circuit based on the list of products of Pauli matrices that make up the linear combination.

引数一覧

argument name	type	role
ope_list	list(elements:int)	List of prodactions of Pauli matrices

戻り値

np.array(bit_list).max()+1（int）:

Returns the maximum target qubit index plus one. This is because qubit indices start from zero.

Python code

def total_search(ope_list):
    """
    This function reads out the coefficients and Pauli matrix product information from the results of the Jordan–Wigner and Bravyi–Kitaev transformations performed using OpenFermion.

    Parameters:
        ope_list: the information about Pauli matrix product

    Returns:
        int: the number of qubits which express quantum state
    """
    # Local Values
    bit_list = [] # A list to store the results of the reading process for the number of qubits
    app_list = "" # A temporary list to store the results of the reading process for the number of qubits
    for i in range(len(ope_list) - 1):
        for j in range(len(ope_list[i+1])-1):
            app_switch = 0
            if ope_list[i+1][j+1] == "X":
                app_switch = 1
            if ope_list[i+1][j+1] == "Y":
                app_switch = 1
            if ope_list[i+1][j+1] == "Z":
                app_switch = 1
            if ope_list[i+1][j+1] == "I":
                app_switch = 1
            if app_switch == 0:
                app_list += str(ope_list[i+1][j+1])
            if app_switch == 1:
                bit_list.append(int(app_list))
                app_list = ""
        bit_list.append(int(app_list))
        app_list = ""
    return np.array(bit_list).max()+1

実行例

import numpy as np
import pitbe

ope = ['', 'X0X1Y2Y3', 'X0Y1Y2X3', 'Y0X1X2Y3', 'Y0Y1X2X3', 'Z0', 'Z0Z1', 'Z0Z2', 'Z0Z3', 'Z1', 'Z1Z2', 'Z1Z3', 'Z2', 'Z2Z3', 'Z3']
main = pitbe.total_search(ope)
print(main)

4