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When trying to import the noise model of ibmq_guadalupe, the following error occurs in thermal_relaxation_error(): NoiseError: 'Invalid T_2 relaxation time parameter: T_2 greater than 2 * T_1.'
This error looks similar to #1818
Steps to reproduce the problem
The error can be reproduced with the following code:
from qiskit_ibm_provider import IBMProvider
from qiskit_aer import AerSimulator
from qiskit_aer.noise import NoiseModel
provider = IBMProvider()
backend_device = provider.get_backend(name='ibmq_guadalupe')
noise_model = NoiseModel.from_backend(backend_device)
What is the expected behavior?
The code should return the noise model associated with the ibm_guadalupe machine. Unlike guadalupe, the other hardware do not produce an error when their noise model are imported.
Suggested solutions
It seems like the problem is coming from the characteristics of the machine itself, most likely T1 or T2 for one of the qubits is not calculated properly.
The text was updated successfully, but these errors were encountered:
This is an oversight in #1818. T2 value is not properly truncated when it is None (i.e. inf) but T1 value is not None (ibmq_guadalupe is now reporting None for T2 of qubit 5). I'll fix it. Thank you for reporting it.
…is deprecated; ibmq_athens is not available (Qiskit#1831)
* Fix REAM Qiskit#1896 qiskit.providers.ibmq is deprecated;
* In README example, simplify code to get aersim_backend
* Update README.md remove shots=1000
* use FakeManilaV2
* Update README.md import Fake backend in the beginning
* Update README.md remove unneeded IBM_Providers import.
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Co-authored-by: Hiroshi Horii <hhorii@users.noreply.github.com>
Informations
What is the current behavior?
When trying to import the noise model of
ibmq_guadalupe
, the following error occurs inthermal_relaxation_error()
:NoiseError: 'Invalid T_2 relaxation time parameter: T_2 greater than 2 * T_1.'
This error looks similar to #1818
Steps to reproduce the problem
The error can be reproduced with the following code:
What is the expected behavior?
The code should return the noise model associated with the
ibm_guadalupe
machine. Unlike guadalupe, the other hardware do not produce an error when their noise model are imported.Suggested solutions
It seems like the problem is coming from the characteristics of the machine itself, most likely T1 or T2 for one of the qubits is not calculated properly.
The text was updated successfully, but these errors were encountered: