# Default value for a state created by QuantumRegister

What's the default value for a state created by QuantumRegister(1,'name_of_the_register')? Is it a $$|0\rangle$$ or a $$|1\rangle$$?

## 1 Answer

Here's the source code for quantumregister.py and quantumcircuit.py.

The default is $$|0\rangle$$. The code goes like:

from qiskit import QuantumCircuit, QuantumRegister
qr = QuantumRegister(1)
circuit = QuantumCircuit(qr)


By the way, if you're just beginning with Qiskit, you could check out Dr. Moran's textbook (this specific example is covered in chapter 5, ~p. 83).