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Aer is a high performance simulator for quantum circuits that includes noise models

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### Summary ### Details and comments

For example the following should run, and return expectation value 0.5: ```python circ = QuantumCircuit(1) estimator.run([(circ, "+")]) ``` Requires updating the calculation of expectation values in the various simulation methods.

### Informations - Qiskit Aer version: 0.17.0 - Python version:3.11 - Operating system:Linux - Architecture: aarch_64 What is the current behavior? The code will work with method="statevector", Device="GPU" but fails...

bug

I have code that runs the MPS simulator. Execution of this code sometimes results in this error: ``` File "/root/miniforge3/envs/env5/lib/python3.11/site-packages/qiskit_aer/jobs/utils.py", line 38, in _wrapper return func(self, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File...

### Summary Compiling qiskit-aer with CUDA support and gcc 12/13 resulted in some internal compiler error, see #2227. The error was resolved by removing the `const ` expression in from...

### What is the expected behavior? Currently, a quantum error can be appended to a QuantumCircuit, which will convert the quantum error to a `QuantumChannelInstruction`. This object consists of a...

enhancement

### Informations - **Qiskit Aer version**: - qiskit_aer-0.16.4 - **Python version**: - 3.11 - **Operating system**: - linux/debian ### What is the current behavior? When simulating small circuits with fake_sherbrooke...

bug

### Summary Update header-only C++ libraries `spdlog` and `nlohmann_json` to more recent versions. This is just to quickly test if something breaks using the GitHub Actions tests. ### Details and...

### Summary `MCSXGate`, `MCYGate`, `MCZGate`, `MCRXGate`, `MCRYGate`, `MCRZGate`, `MCU3Gate`, `MCUGate`, and `MCSwapGate` can not be instantiated due to a mismatch in the number of qubits with the base gate: ```...

### What is the expected behavior? Qiskit 2.0 removed `c_if`, but this is still supported in Aer during the transition period to 2.0. As a consequence, there is a series...

enhancement