Cavity quantum electrodynamics of photonic temporal crystals

• URL: http://arxiv.org/abs/2501.03106v1
• Date: Mon, 06 Jan 2025 16:13:03 GMT
• Title: Cavity quantum electrodynamics of photonic temporal crystals
• Authors: Junhyeon Bae, Kyungmin Lee, Bumki Min, Kun Woo Kim,
• Abstract summary: Photonic temporal crystals host a variety of intriguing phenomena, from wave amplification and mixing to exotic band structures. We introduce a quantum electrodynamical model of PTCs that reveals a deeper connection between classical and quantum pictures.
• Score: 11.957592902904516
• License:
• Abstract: Photonic temporal crystals host a variety of intriguing phenomena, from wave amplification and mixing to exotic band structures, all stemming from the time-periodic modulation of optical properties. While these features have been well described classically, their quantum manifestation has remained elusive. Here, we introduce a quantum electrodynamical model of PTCs that reveals a deeper connection between classical and quantum pictures: the classical momentum gap arises from a localization-delocalization quantum phase transition in a Floquet-photonic synthetic lattice. Leveraging an effective Hamiltonian perspective, we pinpoint the critical momenta and highlight how classical exponential field growth manifests itself as wave-packet acceleration in the quantum synthetic space. Remarkably, when a two-level atom is embedded in such a cavity, its Rabi oscillations undergo irreversible decay to a half-and-half mixed state-a previously unobserved phenomenon driven by photonic delocalization within the momentum gap, even with just a single frequency mode. Our findings establish photonic temporal crystals as versatile platforms for studying nonequilibrium quantum photonics and suggest new avenues for controlling light matter interactions through time domain engineering.

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