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The ability of quantum computers to overcome the exponential memory scalingof many-body problems is expected to transform quantum chemistry. Quantumalgorithms require accurate representations of electronic states on a quantumdevice, but current approximations struggle to combine chemical accuracy andgate-efficiency while preserving physical symmetries, and rely onmeasurement-intensive adaptive methods that tailor the wave function ansatz toeach molecule. In this contribution, we present a symmetry-preserving andgate-efficient ansatz that provides chemically accurate molecular energies witha well-defined circuit structure. Our approach exploits local qubitconnectivity, orbital optimisation, and connections with generalised valencebond theory to maximise the accuracy that is obtained with shallow quantumcircuits. Numerical simulations for molecules with weak and strong electroncorrelation, including benzene, water, and the singlet-triplet gap intetramethyleneethane, demonstrate that chemically accurate energies areachieved with as much as 84% fewer two-qubit gates compared to the currentstate-of-the-art. These advances pave the way for the next generation ofelectronic structure approximations for future quantum computing.

Accurate and gate-efficient quantum ans\"atze for electronic states without adaptive optimisation