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This article details a compiler optimization that reduces quantum circuit depth by 2.5-fold for molecular spin simulations through parallelized architectures and repetition coding. By prioritizing qubit breadth over sequential depth, the method lowers hardware demands while embedding inherent error detection, offering a practical path to more accurate modeling on current devices. As quantum stability improves, such efficiency gains will be critical for scaling complex chemical simulations without waiting for larger physical qubit counts.
FHNW and EPFL Cut Simulation Depth 2.5-Fold with New Compiler

A 2. 5-fold reduction in quantum volume, achieved for complex molecular simulations, demonstrates how parallelised spin systems can outperform conventional methods. This logarithmic compression halves circuit depth while embedding inherent error detection via repetition coding, potentially unlocking more accurate modelling with current hardware.
A new method converts quantum circuits used in simulating nuclear magnetic resonance (NMR) into more efficient forms. Previously these circuits were narrow and deep, limiting performance on current computers. Now they can be reshaped to be wider and shallower through a “fan-out” approach which encodes each component of the simulation into registers sized according to its complexity. A new technique optimises quantum simulations of molecular spins, reducing demands on existing quantum…
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