Quantum nonlinear cavity QED with coherently prepared atoms

Abstract

We propose a method to study the quantum nonlinearity and observe the multiphoton transitions in a multiatom CQED system. We show that by inducing simultaneously destructive quantum interference for the single-photon and two-photon excitations in the CQED system, it is possible to observe the direct three-photon excitation of the higher-order ladder states of the CQED system. We report an experiment with cold Rb atoms confined in an optical cavity and demonstrate such interference control of the multi-photon excitations of the CQED system. The observed nonlinear excitation of the CQED ladder states agrees with a theoretical analysis based on a fully quantized treatment of the CQED system, but disagrees with the semiclassical analysis of the CQED system. Thus it represents the first direct observation of the quantum nature of the multiatom CQED system and opens new ways to explore quantum nonlinearity and its applications in quantum optical systems in which multiple absorbers/emitters are coupled with photons in confined cavity structures.

arXiv comment17 pages, 8 figures

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Cited by in corpus (5)

• Perfect photon absorption in nonlinear regime of cavity quantum electrodynamics
• Electromagnetic control of nonclassicality in cavity QED system
• Perfect photon absorption in hybrid atom-optomechanical system
• Tunable nonlinear coherent perfect absorption and reflection in cavity QED
• Preparation of a single-photon dark state in a chiral quantum system