GPU multi-chunk measure fails when qubits are out of chunk

[doichanj]

Informations

• Qiskit Aer version:
• Python version:
• Operating system:

What is the current behavior?

measure operation returns incorrect value when using multi-chunk parallelization (cache blocking) and index qubit is out of chunk qubits.

Steps to reproduce the problem

This issue can be reproduced by using some noise model into a circuit and using cache blocking in statevector simulator.

What is the expected behavior?

Suggested solutions

norm() and trace() returns batched sum for all chunks so the measured value is always [1, 0].
Disable batched sum so that each chunk returns local sum correctly.

[hhorii]

fixed with #1480.