Engineering propagating cat states with driven four-level systems inside a cavity

作者：Seigo Kikura, Hayato Goto, Takao Aoki · 发表于：Physical Review Applied · 年份：2025 · DOI：10.1103/d9wz-b2ph · 被引用次数：3 · 研究领域：Laser-Matter Interactions and Applications、Quantum Information and Cryptography、Quantum optics and atomic interactions

We propose a method for generating optical cat states in propagating pulses based on cavity quantum electrodynamics (QED). This scheme uses multiple four-level systems (FLSs) inside an optical cavity as a light source. Time-modulating driving stimulates it to produce a superposition of coherent states entangled with the FLSs. The postselection of an appropriate state of the FLSs leads to a multicomponent cat state in a propagating pulse. Taking atomic decay and cavity loss into account, we optimize the cavity external coupling rate to maximize the fidelity. We find that its optimum value is formulated similarly to those of other generation methods for propagating states, suggesting a universal property of cavity-QED systems interacting with fields outside the cavity.