QCMaterial

Wrap a QulacsParametricQuantumCircuit object, which will not be copied.

Copy a QulacsVariationalQuantumCircuit object. This makes a copy of the underlying QulacsParametricQuantumCircuit object.

Apply a qubit operator op to |stateket> and fit the result with circuit * |statebra>. The circuit object will be updated on exit. The squared norm of op * |stateket> will be returned. state0bra will not be modified.

Check if the Python type of a given PyObject matches the expected one

Convertopenfermionop

Args: nqubit (:class:int) openfermionop (:class:openfermion.ops.QubitOperator) Returns: :class:qulacs.Observable

Divide a qubit operator into the hermite and antihermite parts.

Generate pair dobule excitations

Generate single excitations

Generates parallelized numerical grad_cost

Return a copy of variational parameters

Compute <statebra| circuit^+ obs |stateket>, where obs is a hermite observable.

Perform imaginary-time evolution.

ham_op: Hamiltonian vc: Variational circuit. The current value of variational parameters are used as the initial value of the imaginary-time evolution. state0: The initial state to which the Variational circuit is applied to taus: list of imaginary times in ascending order The first element must be 0.0. return: list of variational parameters at the given imaginary times.

Make a wrapped scipy minimizer

Return the number of independent variational parameters

Compute partial derivative of a given function at a point x

Compute <phi (thetabra) | phi(thetaket)>

Parse a tuple representing a Pauli string When x is ((1, "X"), (5, "Y")), returns [1, 5], [PauliID.X, PauliID.Y]

Compute ground state

y = Ax tikhov regularization: minimize ||Ax-b||^2 + λ||x^2||

Compute <phi (thetabra) |H| phi(thetaket)>

Returns UCCGSD circuit.

Update circuit parameters

thetas wil be copied.

Update the values of the independent variational parameters

Update a state using a circuit

Update a state using a circuit

Update a state using a circuit