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VQE Cirq example

As Davit mentioned, any set of mutually commuting observables can be simultaneously measured. This means that if all of the terms of a Hamiltonian commute (in your case all $Z$s), you can simply ...
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How does the Active Space Transform work theoretically?

The inactive Fock operator is the outcome of downfolding the inactive orbitals into the active space. This is explained in quite some detail in various quantum chemistry textbooks. A short summary of ...
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Calculating state fidelity and space complexity of Minimum Eigen Optimizers (VQE, QAOA and Grover Optimizer) in qiskit

See the qiskit.quantum_info documentation and in particular the following documentations: state_fidelity method. Statevector class. DensityMatrix class.
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