Add measure_on_full_support to optimize Pauli string readout mitigation

[ddddddanni]

This PR introduces a new argument, measure_on_full_support, to the measure_pauli_strings function. This feature significantly reduces the overhead of readout error calibration when measuring a large number of Pauli strings that act on different subsets of qubits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (ad37bb7) to head (339897d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

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##             main    #7760   +/-   ##
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  Coverage   99.38%   99.38%           
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  Files        1090     1090           
  Lines       98248    98260   +12     
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+ Hits        97643    97655   +12     
  Misses        605      605           

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[eliottrosenberg]

I tested it in this colab, and it seems that when adding the measure gates to the circuits to measure the specified Pauli operators, it is measuring all of the qubits even when measure_on_full_support=False.

[ddddddanni]

I tested it in this colab, and it seems that when adding the measure gates to the circuits to measure the specified Pauli operators, it is measuring all of the qubits even when measure_on_full_support=False.

Discussed offline, we should not measure all qubits in

Cirq/cirq-core/cirq/contrib/paulistring/pauli_string_measurement_with_readout_mitigation.py

Line 289 in 843f216

ops.measure(*qid_list, key="result"),

, only qubits in the pauli_str needs to be measured. This is bug in the code before this change, and I will send out a PR to fix this tmr.