total_search

概要

この関数では線形結合を構成するパウリ行列積の一覧から量子回路上で必要なビット数を算出する

引数一覧

argument name	type	role
ope_list	list(elements:int)	作用させるパウリ行列積の一覧

戻り値

np.array(bit_list).max()+1（int）:
作用先のビット番号のうち最大のものに1を足して出力する
1を足しているのは作用先のビット番号が0から始まるためである

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

[1]:

import numpy as np
import pitbe

[2]:

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