Tossing two coins simultaneously

So far, we have only played with one coin at a time, but there is nothing stopping us from adding more coins. In this recipe, we will add a coin to the simulation, and toss two coins simultaneously. We will do this by adding a second qubit, expanding the number of qubits – two of everything.

Getting ready

The sample code for this recipe can be found here: https://github.com/PacktPublishing/Quantum-Computing-in-Practice-with-Qiskit-and-IBM-Quantum-Experience/blob/master/Chapter04/ch4_r4_two_coin_toss.py.

How to do it...

Set up your code like the previous example, but with a 2-qubit quantum circuit:

1. Import the classes and methods that we need:

   from qiskit import QuantumCircuit, Aer, execute
   from qiskit.tools.visualization import plot_histogram
   from IPython.core.display import display

2. Set up our quantum circuit with two qubits and two classical bits:

   qc = QuantumCircuit(2, 2)

3. Add the Hadamard gates and the measurement gates...