Ultrafast adiabatic passages in ultrastrongly coupled light-matter systems

2022/07/02 by Gao, Xun, Duan, Liwei, Tang, Pinghua +4
#FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2207.00775

Abstract

We have obtained the solutions of the multimode quantum Rabi model when all modes have identical frequencies ω, including dark states |ϕ_K⟩ with at least K (K=1,2,3,…) photons. Extended to the multiqubit case, they lie close to another dark state \vert ψ⟩ with at most one photon in the spectrum. Taking advantages of such solutions, we find a linear and symmetry-protected adiabatic passage through \vert ψ⟩ to fast generate arbitrary single-photon M-mode W states \vert W_M⟩ with exactly the same speed. The effective minimum energy gap during the adiabatic evolution is further enlarged to 0.63ω when Stark shifts are included, such that arbitrary \vert W_M⟩ can be ultrafast generated in 1.55× 2πω^-1 with fidelity 99%, indepedent of M. This work reveals the existence of linear ultrafast adiabatic passages in light-matter systems.

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