Solving Quantum Chemistry Problems with a D-Wave Quantum Annealer. (arXiv:1811.05256v2 [quant-ph] UPDATED)

Quantum annealing devices have been subject to various analyses in order to
classify their usefulness for practical applications. While it has been
successfully proven that such systems can in general be used for solving
combinatorial optimization problems, they have not been used to solve chemistry
applications. In this paper we apply a mapping, put forward by Xia et al. (The
Journal of Physical Chemistry B 122.13 (2017): 3384-3395.), from a quantum
chemistry Hamiltonian to an Ising spin glass formulation and find the ground
state energy with a quantum annealer. Additionally we investigate the scaling
in terms of needed physical qubits on a quantum annealer with limited
connectivity. To the best of our knowledge, this is the first experimental
study of quantum chemistry problems on quantum annealing devices. We find that
current quantum annealing technologies result in an exponential scaling for
such inherently quantum problems and that new couplers are necessary to make
quantum annealers attractive for quantum chemistry.

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