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A framework for quantum computing

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As the first version of GST is about to be merged, I thought it could have been useful to collect somewhere all the desired improvements and features to add on...

enhancement

New Rotosolve optimizer for the VQE class and a useful function to decompose a matrix into Pauli Operators, this was developed under the umbrella of QuantumSpain project (https://quantumspain-project.es/). Checklist: -...

Currently some tests are executing circuits using the `circuit.execute()`/`circuit()` interface, instead of `backend.execute_circuit`. This invokes the `GlobalBackend` which is set to an arbitrary value, potentially from a previous test, unless...

This just escaped a previous review. The idea of the `MetaBackend` was to avoid any need for an explicit registration in `qibo`, so let's make it complete removing all mentions...

Does Qibo have operator Schmidt decomposition as defined in [this Stack Exchange post](https://physics.stackexchange.com/a/662215)? This would be a generalization of this function https://github.com/qiboteam/qibo/blob/e7061b0ea2d83ebb6c592e9596170c6ff30cf5b2/src/qibo/transpiler/unitary_decompositions.py#L88-L108

enhancement
quantum_info module

Checklist: - [ ] Reviewers confirm new code works as expected. - [ ] Tests are passing. - [ ] Coverage does not decrease. - [ ] Documentation is updated.

In test_models_dbi.py and test_models_dbi_utils.py there are a some tests that are not using correctly the backend. For example in the test test_gradient_descent (test_models_dbi.py), when the function gradient_descent is called (line...

bug

The following test is failing on `pytorch` only while everything else passes. https://github.com/qiboteam/qibo/blob/ce7076a89acbec04fc3eb21eeb754709257db2be/tests/test_models_dbi.py#L128-L143 The error message is: FAILED tests/test_models_dbi.py::test_polynomial_energy_fluctuation[pytorch] - ValueError: No solution can be found with polynomial approximation. Increase...

bug
help wanted

I report here some things to be fixed in the mentioned example: 1. the first plot cannot be read: labels are overlapping. I would remove them and set step number...

bug

I think it would be helpful to group here all the `QASM` directives we would like to be added to qibo's `QASMParser`. ```[tasklist] ### QASM directives - [ ] `barrier`...

enhancement