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Collectively induced transparency and absorption in waveguide quantum electrodynamics with Bragg atom arrays
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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 quantum electrodynamics(QED)systems.
waveguide quantum electrodynamicscollective quantum statesphoton absorptionBragg atom array
Haolei Cheng、Wei Nie
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Center for Joint Quantum Studies and Department of Physics,School of Science,Tianjin University,Tianjin 300350,China
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology,Tianjin University,Tianjin 300350,China
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