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Recent advancements in quantum information and quantum technology hasstimulated a good deal of interest in the development of quantum algorithms forenergetics and properties of many-fermionic systems. While the variationalquantum eigensolver is the most optimal algorithm in the Noisy IntermediateScale Quantum era, it is imperative to develop low depth quantum circuits thatare physically realizable in quantum devices. Within the unitary coupledcluster framework, we develop COMPASS, a disentangled ansatz constructionprotocol that can dynamically tailor an optimal ansatz using the one andtwo-body cluster operators and a selection of rank-two scatterers. Theconstruction of the ansatz may potentially be performed in parallel quantumarchitecture through energy sorting and operator commutativity prescreening.With significant reduction in the circuit depth towards the simulation ofmolecular strong correlation, COMPASS is shown to be highly accurate andresilient to the noisy circumstances of the near-term quantum hardware.

On-the-fly Tailoring towards a Rational Ansatz Design for Digital Quantum Simulations