rz(next(it), 1) # Define the expectation value corresponding to the energy op = ~StateFn(h2_hamiltonian) @ StateFn(wavefunction) 现在,我们选择是否VQE需要使用Gradient或NaturalGradient,决定QuantumInstance执行量子电路和运行算法。 grad = Gradient(grad_method='lin_comb') qi_sv = QuantumInstance(Aer...
因为人们通常选择aer_simulator创造shot噪声(抽样噪声),或更可能是真实设备的输出,VQE有一个include_custom参数传递给ExpectationFactory。当使用Aer qasm模拟器时,把它设为True,工厂就会返回AerPauliExpectation,用在快照指令中,当False时(默认),就会返回PauliExpectation。 如下例子就显示了include_custom=True,输出匹配状态...
We use this function to plot the :math:`Z` expectation value over a range of input amplitudes. .. jupyter-execute:: import matplotlib.pyplot as plt for amp in np.linspace(0, 1, 10): ys = fast_sim(amp) plt.plot(np.linspace(0, 3., 100), np.real(np.abs(ys[:, 0])**2-np....
opflow.gradients import GradientBase from qiskit.algorithms.optimizers import Optimizer from qiskit_nature.exceptions import QiskitNatureError from qiskit_nature.circuit.library.initial_states import HartreeFock from qiskit_nature.mappers.second_quantization import (BravyiKitaevMapper, JordanWignerMapper, Parity...
Fix weighted_pauli_operator expectation value mode for Aer 0.4 release. (#808) Update python 3.6 Gaussian driver. (#808) Added Python 3.8 Gaussian drivers. (#808) 0.6.3 - 2020-01-29 Changed Add install checks for cvxopt, torch, pyscf. Add python 3.8 support. (#795) Deprecated Python...
the eigenvalue changes less than a set value. - | Adds the new :attr:`~qiskit.algorithms.minimum_eigensolvers.AdaptVQE.gradient_threshold` setting which will replace the :attr:`~qiskit.algorithms.minimum_eigensolvers.AdaptVQE.threshold` in the future. Added a new attribute :attr:`~qiskit.al...