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The objective of the portfolio optimization problem is to trade off expected return ($\mu^T x$) with the risk taken ($x^T \Sigma $x). This could be achieved by introducing a constraint on the risk, e.g. $x^T \Sigma x \leq R$, for an acceptable risk level $R$ and then maximize the return under this constraint. However, this is not a QUBO, i.e., it cannot be ...


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Depth is the number of repetitions of the basic circuit of the variational form. By adding more repetitions the expectation is that it can cover a larger part of the Hilbert space and hopefully include the solution space that a shallower one could not. Now each basic circuit has parameters so it can be varied. Adding more repetitions adds more parameters and ...


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The FermionicOperator, when its mapped to a Qubit Operator, indeed drops paulis that are below a given threshold. If you wanted to keep all the paulis, regardless of their weights then you could alter your local copy to comment the thresholding out in the one and two body mapping routines. As far as I am aware a weighted paulis list given to ...


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