Qubit¶

class Qubit(register=None, index=None)[source]¶

Bases: Bit

Implement a quantum bit.

Creates a qubit.

Parameters

register (QuantumRegister) -- Optional. A quantum register containing the bit.
index (int) -- Optional. The index of the bit in its containing register.

Raises

CircuitError -- if the provided register is not a valid QuantumRegister

Attributes

index¶

Get the index of an old-style bit in the register that owns it.

Deprecated since version 0.17: Use QuantumCircuit.find_bit() instead.

In modern Qiskit Terra (version 0.17+), bits are the fundamental object and registers are aliases to collections of bits. A bit can be in many registers depending on the circuit, so a single containing register is no longer a property of a bit. It is an error to access this attribute on bits that were not constructed as "owned" by a register.

register¶

Get the register of an old-style bit.

Deprecated since version 0.17: Use QuantumCircuit.find_bit() instead.

In modern Qiskit Terra (version 0.17+), bits are the fundamental object and registers are aliases to collections of bits. A bit can be in many registers depending on the circuit, so a single containing register is no longer a property of a bit. It is an error to access this attribute on bits that were not constructed as "owned" by a register.