2021/10/25 by L. L. Ping, W. Li, Ping, L. L. +7
Computer Science · Engineering · Mathematics · Physics and Astronomy · #Coherence (philosophical gambling strategy) #FOS: Physical sciences #Fock space #Mathematics #Optical Network Technologies #Parametric statistics #Physics #Quantum #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum electrodynamics #Quantum entanglement #Quantum mechanics #Quantum optics and atomic interactions #Qubit #Superposition principle #quant-ph
paper · pdf · doi:10.48550/arxiv.2110.12557
arxiv created 2021/10/25 · openalex publication_date 2021/10/25 · arxiv updated 2021/10/26 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We present a new paradigm in the field of cavity QED by bringing out remarkable features associated with the avoided crossing of the dressed state levels of the Jaynes Cummings model. We demonstrate how the parametric couplings, realized by a second order nonlinearity in the cavity, can turn the crossing of dressed states into avoided crossings. We show how one can generate coherence between the avoided crossing of dressed states. Such coherences result, for example, in quantum beats in the excitation probability of the qubit. The quality of quantum beats can be considerably improved by adiabatically turning on the parametric interaction. We show how these avoided crossings can be used to generate superpositions of even or odd Fock states with the remarkable property of equal weights for the states in superposition. The fidelity of generation is more than 95%. In addition, we show strong entanglement between the cavity field and the qubit with the concurrence parameter exceeding 90%.