Zeno and anti-Zeno effects in dark-state dynamics under thermal dephasing

• URL: http://arxiv.org/abs/2603.17892v1
• Date: Wed, 18 Mar 2026 16:20:47 GMT
• Title: Zeno and anti-Zeno effects in dark-state dynamics under thermal dephasing
• Abstract summary: We study the stability of dark states in a cavity QED system subject to thermal dephasing.<n>We identify distinct parameter regimes corresponding to Zeno and anti-Zeno behavior.<n>Our results provide insights into the interplay between measurement back-action and decoherence in open quantum systems.
• Score: 2.1402559799356076
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The quantum Zeno and anti-Zeno effects describe how frequent measurements can either suppress or accelerate quantum dynamics. While extensively studied in various platforms, their manifestation in dark-state dynamics remains largely unexplored. Here we investigate the stability of dark states in a cavity QED system consisting of two atoms coupled to a single-mode cavity, subject to thermal dephasing that models continuous quantum non-demolition monitoring. Using the Tavis--Cummings model within a Lindblad master equation framework, we numerically analyze how measurement-induced dephasing affects dark-state retention and stabilization time. We identify distinct parameter regimes corresponding to Zeno and anti-Zeno behavior: at low dephasing intensities, increasing the measurement strength accelerates the loss of dark-state coherence (anti-Zeno regime), while at higher intensities, it slows down the dynamics and partially recovers dark-state weight (Zeno regime). The transition between these regimes is controlled by the dephasing rates, the cavity photon exchange, and the asymmetry in atom-field couplings. We show that even under strong dephasing, a finite dark-state component persists, demonstrating remarkable robustness. Our results provide insights into the interplay between measurement back-action and decoherence in open quantum systems, with implications for quantum control and information storage.

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