tebd.py 文件源码

def paulidouble(i, j, tensor=True):
    pauli_i = pauli(i)
    pauli_j = pauli(j)
    outer = np.zeros((4, 4), dtype=np.complex)
    outer[:2, :2] = pauli_i
    outer[2:, 2:] = pauli_j
    if tensor:
        outer.shape = (2, 2, 2, 2)
    return outer

# def paulitwo_left(i):
    # return np.kron(pauli(i), pauli(0)) 

# def paulitwo_right(i):
    # return np.kron(pauli(0), pauli(i))

# def newrho_DK(Lket, theta_ij):
    # Lbra = np.conjugate(L_before)
    # theta_star = np.conjugate(theta_ij)
    # in_bracket = scon(Lbra, Lket, theta_ij, theta_star,
                # [1], [1], [2, 3, 1,