Add information somewhere about measuring qubits

[beckykd]

URL, if applicable

maybe in the construct-circuits topic

Describe the new content you are requesting.

We talk about measuring qubits and where measurements can go in a couple of error messages but we actually never mention how to add a measurement in the guides.

If this new content request is accepted, do you want to write the content?

I only want to review the material when it's finished

[javabster]

I think this could be a whole page on its own, including:

• the different ways to apply measurement (measure_all, measure etc.)
• measurement constraints with different primitives
• you cant put gates after measurement (unless its dynamic circuit)
• also check error codes 8036, 7006

[beckykd]

Need to cover all these:

• [ ] Error code 8036: All measure(circuit) and acquire(pulse) instructions must align to a 16 sample boundary. Measurements may be impacted by delays which have non-multiple of 16 durations

Due to hardware limitations, measure and acquire instructions must occur at 16 sample multiples.

• [x] Error code 7006: Qubit measurement not the final instruction

Cannot perform any instruction on a measured qubit. Remove all instructions following a measurement.

• [x] Error code 7004: Qubit measured multiple times in circuit.

Remove multiple measurements on qubits.

• [ ] Error code 8001: qubits {} in measurement are not mapped

Assign qubits to a classical memory slot.

• [x] Error code 9615: No classical reg for the measure on circuit {}

Ensure the classical register exists

• [x] Error code 1512: Circuits without measurements are not supported in Sampler.

• [ ] Add links from the above Error codes to this new topic.

• [ ] Also link from 8038 to the new topic (Try increasing the value or reducing the number of measurements/resets within your circuits.)

• [ ] Link from 8045 to the new topic (same solution as 8038)