Supplemental lab typo/error?

[AndreaBarletta]

Hi, I’ve come across a couple of issues while following the example code.

The text says the code is meant for the Eagle architecture, but the backend used is ibm_torino, which uses the Heron architecture instead. In my case, least_busy() seems to pick ibm_sherbroke. This causes compatibility issues, even when I manually change the qubit_lines, the circuit still doesn't execute properly.

Additionally, the following line fails (probably due to the fact that ibm_shrebroke already implements this):

backend.target.add_instruction(IfElseOp, name="if_else")

It throws an exception and prevents the rest of the code from working.

Forcing the backend to use ibm_torino using

backend = service.backend("ibm_torino")

seems to fix everything (although it's not consistent with the text as it specifies using Eagle architecture)

Thanks in advance!

[0sophy1]

Hi, it depends on backend. so if you uses heron devices, you need that add instruction.

[AndreaBarletta]

For sure, my only concern was that the text clearly specifies multiple times to use eagle, but then the code supposes heron is used