Information

• Qiskit Terra version: latest
• Python version:
• Operating system:

What is the current behavior?

qc= QuantumCircuit(2)
qc.h(range(2))
qc.cz(0,1)
qc.draw()

     ┌───┐   
q_0: ┤ H ├─■─
     ├───┤ │ 
q_1: ┤ H ├─■─
     └───┘   

transpile(qc, basis_gates=['h', 'cx']).draw()

     ┌───┐               
q_0: ┤ H ├───────■───────
     ├───┤┌───┐┌─┴─┐┌───┐
q_1: ┤ H ├┤ H ├┤ X ├┤ H ├
     └───┘└───┘└───┘└───┘

Steps to reproduce the problem

What is the expected behavior?

I would expect the default level of optimization to remove trivial things like repeated H gates.

Suggested solutions