Collectively induced transparency and absorption in waveguide QED with Bragg atom arrays

• URL: http://arxiv.org/abs/2407.04927v1
• Date: Sat, 6 Jul 2024 02:30:54 GMT
• Title: Collectively induced transparency and absorption in waveguide QED with Bragg atom arrays
• Authors: Haolei Cheng, Wei Nie,
• Abstract summary: We study collective quantum phenomena in waveguide-coupled Bragg atom arrays with inhomogeneous frequencies. For atoms without free-space dissipation, collectively induced transparency is produced by destructive quantum interference between subradiant and superradiant states. We find collectively induced absorption (CIA) by studying the influence of free-space dissipation on photon transport.
• Score: 0.5463417677777277
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Collective quantum states, such as subradiant and superradiant states, are useful for controlling optical responses in many-body quantum systems. In this work, we study novel collective quantum phenomena in waveguide-coupled Bragg atom arrays with inhomogeneous frequencies. For atoms without free-space dissipation, collectively induced transparency is produced by destructive quantum interference between subradiant and superradiant states. In a large Bragg atom array, multi-frequency photon transparency can be obtained by considering atoms with different frequencies. Interestingly, we find collectively induced absorption (CIA) by studying the influence of free-space dissipation on photon transport. Tunable atomic frequencies nontrivially modify decay rates of subradiant states. When the decay rate of a subradiant state equals to the free-space dissipation, photon absorption can reach a limit at a certain frequency. In other words, photon absorption is enhanced with low free-space dissipation, distinct from previous photon detection schemes. We also show multi-frequency CIA by properly adjusting atomic frequencies. Our work presents a way to manipulate collective quantum states and exotic optical properties in waveguide QED systems.

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