Conditional non-Hermitian acceleration of multiphoton atomic transitions

• URL: http://arxiv.org/abs/2608.09562v1
• Date: Mon, 10 Aug 2026 12:59:20 GMT
• Title: Conditional non-Hermitian acceleration of multiphoton atomic transitions
• Abstract summary: Continuous monitoring can convert a dissipative channel into a resource for accelerating otherwise slow multiphoton transitions.<n>We derive effective two-state descriptions of odd-multiphoton resonances in the semiclassical and quantum Rabi models.
• Score: 42.13843953705695
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Continuous monitoring can convert a dissipative channel into a resource for accelerating otherwise slow multiphoton transitions. We consider a three-level atom in a $Λ$ configuration and condition the evolution on the absence of photon emission through an auxiliary monitored decay channel. The resulting no-jump dynamics is governed by a non-Hermitian Rabi-type Hamiltonian. Using Floquet theory and Brillouin--Wigner projection-operator perturbation method, we derive effective two-state descriptions of odd-multiphoton resonances in the semiclassical and quantum Rabi models. The effective population-transfer rate, defined as the inverse of the time required for the first complete transfer between the atomic states, is maximized at an exceptional point, where its enhancement factor approaches $π/2$, corresponding to an approximately $57\%$ increase over the Hermitian value. Numerical results for three- and five-photon resonances closely reproduce the analytical transition times and yield non-negligible postselection probabilities. By contrast, the complete unconditioned dissipative evolution does not exhibit the same population-transfer enhancement. These results demonstrate a speed--success trade-off for measurement-conditioned multiphoton state transfer.

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