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arXiv · 2603.22130

Non-Markovian renormalization of optomechanical exceptional points

Aritra Ghosh·M. Bhattacharya
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Abstract

We investigate how non-Markovian mechanical dissipation affects exceptional points in linearized optomechanical systems with red-sideband drive. For a chosen non-Ohmic mechanical bath, we derive analytical conditions for the memory-renormalized exceptional point by employing a pseudomode mapping, thereby demonstrating that structured environments displace the mode coalescence away from the Markovian prediction. Crucially, we reveal that failing to account for this memory-induced shift suppresses the divergent Petermann factor by orders of magnitude, showing that accurate bath modeling is essential for the successful operation of exceptional-point-based devices whenever reservoir-induced memory is non-negligible. We finally show that non-Markovianity modifies the cavity reflection spectrum, manifesting as a shallower optomechanically-induced-transparency dip, providing therefore an experimentally-accessible signature of structured mechanical environments.

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quant-phcond-mat.mes-hallcond-mat.stat-mechphysics.optics

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Aritra Ghosh, M. Bhattacharya. 2026-03-23. Non-Markovian renormalization of optomechanical exceptional points. https://doi.org/10.1103/pn7p-yb5r

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