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Doubling the size of quantum simulators by entanglement forging

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 نشر من قبل Andrew Eddins
 تاريخ النشر 2021
  مجال البحث فيزياء
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Quantum computers are promising for simulations of chemical and physical systems, but the limited capabilities of todays quantum processors permit only small, and often approximate, simulations. Here we present a method, classical entanglement forging, that harnesses classical resources to capture quantum correlations and double the size of the system that can be simulated on quantum hardware. Shifting some of the computation to classical post-processing allows us to represent ten spin-orbitals on five qubits of an IBM Quantum processor to compute the ground state energy of the water molecule in the most accurate simulation to date. We discuss conditions for applicability of classical entanglement forging and present a roadmap for scaling to larger problems.



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