# qiskit.aqua.components.initial_states.Zero¶

class Zero(num_qubits)[source]

The zero (null/vacuum) state.

This is suitable for those situations in which the all-zeros state is the desired state. This is the case for a vacuum state in physics or chemistry

Parameters

num_qubits (int) – Number of qubits, has a minimum value of 1.

__init__(num_qubits)[source]
Parameters

num_qubits (int) – Number of qubits, has a minimum value of 1.

Methods

 __init__(num_qubits) type num_qubits int construct_circuit([mode, register]) Construct the statevector of desired initial state.

Attributes

property bitstr
construct_circuit(mode='circuit', register=None)[source]

Construct the statevector of desired initial state.

Parameters
• modevector or circuit. The vector mode produces the vector. While the circuit constructs the quantum circuit corresponding that vector.

• register – qubits for circuit construction.

Returns

statevector.

Return type

QuantumCircuit or numpy.ndarray

Raises

AquaError – when mode is not ‘vector’ or ‘circuit’.