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O'Brien, T.E. (author), Tarasinski, B.M. (author), Terhal, B.M. (author)Quantum phase estimation (QPE) is the workhorse behind any quantum algorithm and a promising method for determining ground state energies of strongly correlated quantum systems. Low-cost QPE techniques make use of circuits which only use a single ancilla qubit, requiring classical post-processing to extract eigenvalue details of the system....journal article 2019