Quantum walk comb in a fast gain laser

• 成果类型: Article
• 署名作者: Heckelmann, Ina; Bertrand, Mathieu; Dikopoltsev, Alexander; Beck, Mattias; Scalari, Giacomo; Faist, Jerome
• 署名单位: Swiss Federal Institutes of Technology Domain; ETH Zurich; Swiss Federal Institutes of Technology Domain; ETH Zurich
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9645
• DOI: 10.1126/science.adj3858
• 发表日期: 2023-10-27
• 页码: 434-438
• 关键词: frequency; cavity

摘要

Synthetic lattices in photonics enable the exploration of light states in new dimensions, transcending phenomena common only to physical space. We propose and demonstrate a quantum walk comb in synthetic frequency space formed by externally modulating a ring-shaped semiconductor laser with ultrafast recovery times. The initially ballistic quantum walk does not dissipate into low supermode states of the synthetic lattice; instead, the state stabilizes in a broad frequency comb, unlocking the full potential of the synthetic frequency lattice. Our device produces a low-noise, nearly flat broadband comb (reaching 100 per centimeter bandwidth) and offers a promising platform to generate broadband, tunable, and stable frequency combs.