Hardware Efficient Quantum Algorithms for Vibrational Structure Calculations

• URL: http://arxiv.org/abs/2003.12578v1
• Date: Fri, 27 Mar 2020 18:00:23 GMT
• Title: Hardware Efficient Quantum Algorithms for Vibrational Structure Calculations
• Authors: Pauline J. Ollitrault, Alberto Baiardi, Markus Reiher, Ivano Tavernelli
• Abstract summary: We introduce a framework for the calculation of ground and excited state energies of bosonic systems suitable for near-term quantum devices. We test different parametrizations of the vibrational wave function, which can be encoded in quantum hardware. We evaluate the requirements, number of qubits and circuit depth, for the calculation of vibrational energies on quantum hardware.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce a framework for the calculation of ground and excited state energies of bosonic systems suitable for near-term quantum devices and apply it to molecular vibrational anharmonic Hamiltonians. Our method supports generic reference modal bases and Hamiltonian representations, including the ones that are routinely used in classical vibrational structure calculations. We test different parametrizations of the vibrational wave function, which can be encoded in quantum hardware, based either on heuristic circuits or on the bosonic Unitary Coupled Cluster Ansatz. In particular, we define a novel compact heuristic circuit and demonstrate that it provides the best compromise in terms of circuit depth, optimization costs, and accuracy. We evaluate the requirements, number of qubits and circuit depth, for the calculation of vibrational energies on quantum hardware and compare them with state-of-the-art classical vibrational structure algorithms for molecules with up to seven atoms.

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