Measuring expectation value for an operator with noise

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  • qiskit-aer

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

    • Hello everyone, I am currently learning the work with Qiskit and I came across a curious problem. Although the documentation does not explicitly mention it, when .eval() method is applied on an operator (which was prepared using ExpectationFactory and CircuitSampler with simulator backend from a SumOp type Hamiltonian and a state Psi converted from a circuit), the expectation values is apparently evaluated by "algebraic" calculation rather than a circuit simulation, not to mention the absence of noise (the result is always the same). This fact seems to be mentioned in documentation https://qiskit.org/documentation/stubs/qiskit.opflow.expectations.ExpectationFactory.build.html . There also seems to a relevant be an issue on Qiskit Github https://github.com/Qiskit/qiskit-aer/issues/810 , but there have not been any updates from end of 2020.

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    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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