shiavm006 opened a new issue, #800:
URL: https://github.com/apache/mahout/issues/800
### Description
When `backend_config` is missing required keys (`backend_name` or
`backend_options`), the code raises a generic `KeyError` that doesn't clearly
indicate what's missing or what's required. This makes debugging difficult for
users who accidentally omit required configuration keys.
The docstring in `QuMat.__init__()` claims it raises `KeyError` for missing
keys, but the error message is not helpful. Additionally, there's inconsistency
in how backends handle missing keys - some use `.get()` with defaults (Cirq),
while others use direct dictionary access (Qiskit, Amazon Braket).
### Steps to Reproduce
1. Create a `backend_config` dictionary missing the `backend_name` key:hon
from qumat import QuMat
config = {"backend_options": {"simulator_type": "aer_simulator", "shots":
1024}}
qumat = QuMat(config)2. Or create a config missing `backend_options`:
config = {"backend_name": "qiskit"}
qumat = QuMat(config)### Expected Behavior
Should raise a clear `ValueError` with a helpful message like:
### Expected Behavior
Should raise a clear ValueError with a helpful message
### Actual Behavior
Raises a generic `KeyError`:
### Environment
- **OS:** e.g., Windows, Linux
- **Browser/Tool Version:** e.g., Chrome 96, Python 3.8
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