Overview¶

The Pauli X-gate is a simple negation operation. It corresponds to a classical NOT gate.

Here is how it works:

|0> --> |1>
|1> --> |0>

Imports¶

In [6]:

import qiskit
from qiskit import QuantumCircuit, Aer, execute
from qiskit.extensions import Initialize

Build¶

Let's try first with |0> --> |1> example. By default qubit is initialized to |0>

In [2]:

qc = QuantumCircuit(1) # quantum circuit with one qubit
qc.x(0) # applying X-gate
backend = Aer.get_backend('statevector_simulator')
result = execute(qc,backend).result()
out_state = result.get_statevector()
print(out_state)

[0.+0.j 1.+0.j]

Now, let's see what will happen if we apply X-gate on |1> qubit

In [3]:

initialize_qubit = Initialize([0,1])
qc.append(initialize_qubit, [0])

Out[3]:

In [4]:

qc.x(0)
backend = Aer.get_backend('statevector_simulator')
result = execute(qc,backend).result()
out_state = result.get_statevector()
print(out_state)

[1.+0.j 0.+0.j]

Execute¶

Analyze¶

Notes¶

In [7]:

qiskit.__version__

Out[7]:

'0.16.1'