State module

The State module is used to create objects representing quantum states.

class State.BasisStates(dimension)

Bases: object

creates the pure basis states with the given dimension.

Parameters

dimension – (int) dimensions of vector space

class State.Qubit(a, b)

Bases: State.State

Subclass of the State class. Qubits are specifically 2 dimensional states. Builds the state vector.

Parameters

• a – (int) amplitude of basis state 0

• b – (int) amplitude of basis state 1

class State.State(matrix)

Bases: object

General Method of creating objects that represent quantum states

Parameters

matrix – (array) Matrix representing Quantum State

apply_gate(gate)

Applies the gate given as argument to the quantum state After asserting that the dimensions of the state and gate match, calculates the dot product of the gate’s operator and the state’s vector, and saves the result as the new updated state vector.

Parameters

gate – (array) gate of the circuit

measure()

Measures the quantum state and collapses it to one of its basis states. Collapses the wavefunction to one of its basis states by using the probabilities from the the method of the probabilities function and the numpy random library.

Returns

(int) index of collapsed state

probabilities()

Calculates the amplitude of each basis state in an entangled state Goes through the amplitudes of each basis, multiplies it by its conjugate, and outputs a list of the basis states and their corresponding probabilities inside the state vector.

Returns

(list) basis states and their probabilities inside the state vector