T1 is not working on devices

[yaelbh]

experiment_data._data doesn't make sense in machines that have more than one qubit, for example:

[{'counts': {'0': 4441, '1': 3751}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 80}}, {'counts': {'0': 6856, '1': 1336}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 83}}, {'counts': {'0': 8188, '1': 4}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 86}}, {'counts': {'0': 2, '1': 8190}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 89}}, {'counts': {'0': 4822, '1': 3370}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 92}}, {'counts': {'0': 6938, '1': 1254}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 95}}, {'counts': {'0': 8192}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 98}}, {'counts': {'0': 3, '1': 8189}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 101}}, {'counts': {'0': 5215, '1': 2977}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 104}}, {'counts': {'0': 7054, '1': 1138}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 107}}, {'counts': {'0': 8188, '1': 4}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 110}}, {'counts': {'0': 3, '1': 8189}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 113}}, {'counts': {'0': 5494, '1': 2698}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 116}}, {'counts': {'0': 7168, '1': 1024}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 119}}, {'counts': {'0': 8188, '1': 4}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 122}}, {'counts': {'0': 3, '1': 8189}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 125}}, {'counts': {'0': 5654, '1': 2538}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 128}}, {'counts': {'0': 7268, '1': 924}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 131}}, {'counts': {'0': 8190, '1': 2}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 134}}, {'counts': {'0': 3, '1': 8189}, 'metadata': {'experiment_type': 'T1', 'qubit': 0, 'unit': 'us', 'xval': 137}}]

Haggai mentioned a known marginalization issue, but I couldn't find any details about it.

[ShellyGarion]

Perhaps this may be related:
Qiskit/qiskit#6430
Qiskit/qiskit#6486

[yaelbh]

Now it seems that armonk is not working either.
The marginalization issue is not related: it is a crash, if there is no crash then should work; it's related to pulse instructions; and the issue doesn't happen if we use id instructions instead of delay.
Qiskit/qiskit#6666

[yaelbh]

Following a fix in Terra by @nkanazawa1989, T1 can work now. This requires adding alignment=16, scheduling_method="alap" to the traspiler options.