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TUE: Tuesday Contributed Sessions

TUE 11: Quantum Optics and Quantum Computation

TUE 11.3: Talk

Tuesday, September 9, 2025, 14:45–15:00, ZHG104

Hybrid Qubit Encoding: Splitting Fock Space into Fermionic and Bosonic Subspaces — •Francisco Javier del Arco Santos — Institute for Computer Science, University of Augsburg, Augsburg, Germany

The main issue of computational chemistry is solving the Schrodinger Equation. In consequence, many methods have been developed in order to approximate the ground and first excited molecular states. It has already been predicted that the application of quantum computers would be useful for this research area. However, nowadays quantum computers still being reduced in number of qubits (order of a few hundred) and with relatively high noise. Efficient encoding of electronic operators into qubits is essential for quantum chemistry simulations. Most of the methods treat Fermionic degrees of freedom and qubits one a one-to-one fashion, handling their interactions. Alternatively, pairs of electrons can be represented as quasi-particles and encoded into qubits, significantly simplifying calculations. This work presents a Hybrid Encoding that allows splitting the Fock space into Fermionic and Bosonic subspaces. By leveraging the strengths of both approaches, we provide a flexible framework for optimizing quantum simulations based on molecular characteristics and hardware constraints. Afterwards, it has been applied in order to simulate molecular systems, which would be prohibitive without this hybrid schema.

Keywords: Quantum Chemistry; Quantum Computing; NISQ; Encoding; Fermionic