qupy package

Submodules

qupy.operator module

qupy.operator.iqft(n)

qupy.operator.phase_shift(phi)

qupy.operator.qft(n)

qupy.operator.rx(phi)

qupy.operator.ry(phi)

qupy.operator.rz(phi)

qupy.qubit module

class qupy.qubit.Qubits(size, **kargs)

Bases: object

Creating qubits.

Args:

size (int):

Number of qubits.

dtype:

Data type of the data array.

gpu (int):

GPU machine number.

Attributes:

data (numpy.ndarray or cupy.ndarray):

The state of qubits.

size:

Number of qubits.

dtype:

Data type of the data array.

expect(self, observable)

Method to get expected value of observable.

Args:

observable (dict or numpy.ndarray or cupy.ndarray):

Physical quantity operator. If you input numpy.ndarray or cupy.ndarray as observable, this method returns \(\langle \psi | \mathrm{observable} | \psi \rangle\), where \(| \psi \rangle\) is the states of qubits. If you use dict input, you have to set {‘operator1’: coef1, ‘operator2’: coef2, ‘operator3’: coef3, …}, such as {‘XIX’: 0.32, ‘YYZ’: 0.11, ‘III’: 0.02}. If you input dict as observable, this method returns \(\sum_i \mathrm{coef}i \langle \psi | \mathrm{operator}i | \psi \rangle\).

n_trial (:class: int):

cumulative number.

Returns:

float: Expected value.

gate(self, operator, target, control=None, control_0=None)

Gate method.

Args:

operator (numpy.ndarray or cupy.ndarray):

Unitary operator

target (None or int or tuple of int):

Operated qubits

control (None or int or tuple of int):

Operate target qubits where all control qubits are 1

control_0 (None or int or tuple of int):

Operate target qubits where all control qubits are 0

get_state(self, flatten=True)

Get state.

Args:

flatten (bool):

If you set flatten=False, you can get data format used in QuPy. otherwise, you get state reformated to 1D-array.

project(target)

projection(self, target)

Projection method.

Args:

target (None or int or tuple of int):

projected qubits

Returns:

int: O or 1.

set_state(self, state)

Set state.

Args:

state (str or list or numpy.ndarray or cupy.ndarray):

If you set state as str, you can set state \(|\mathrm{state}\rangle\) (e.g. state=‘0110’ -> \(|0110\rangle\).) otherwise, qubit state is set that you entered as state.

Module contents