Observation of Tunable Superradiant Frequency Combs

• URL: http://arxiv.org/abs/2604.14601v2
• Date: Fri, 17 Apr 2026 04:28:03 GMT
• Title: Observation of Tunable Superradiant Frequency Combs
• Abstract summary: Cavity quantum electrodynamics with quantum emitters coupled to resonators provides a powerful platform for engineering light-matter interactions.<n>Superradiance, arising from quantum interference among emitters, has been explored as a route to ultrastable continuous radiation.<n>We introduce a driven-dissipative cavity-QED model that elucidates how the periodic pulsed superradiant phase emerges from collective.
• Score: 5.901711081262737
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Cavity quantum electrodynamics (QED) with quantum emitters coupled to resonators provides a powerful platform for engineering light-matter interactions and exploring collective phenomena. In particular, superradiance, arising from collective quantum interference among emitters, has been explored as a route to ultrastable continuous radiation. However, engineering superradiance in the time domain to realize periodic pulsed sources or frequency combs remains largely unexplored. Here, we investigate the non-equilibrium many-body dynamics of a driven spin ensemble coupled to an on-chip superconducting resonator and uncover a dynamical phase transition from continuous-wave to periodic pulsed superradiant emission. To quantitatively capture the observed dynamical phases, we introduce a driven-dissipative cavity-QED model that elucidates how the periodic pulsed superradiant phase emerges from collective, periodically repeating spin dynamics stabilized by the interplay of coherence growth, disorder, and dissipation. We also find that rare-earth ion spin systems exhibiting both optical and microwave transitions enable phase-synchronized, dual-rail superradiant frequency combs in both the microwave and optical domains. Our results not only open new avenues for dual-rail frequency-comb applications in quantum metrology and information processing, but also establish a fundamental connection between periodic pulsed superradiance and the emergence of a continuous time crystal as a novel nonequilibrium phase in driven open systems.

Related papers

• Continuous Narrow-Linewidth Superradiance in Waveguide QED [0.0]
  Superradiant lasers promise continuous, narrow-linewidth coherent emission at the bare atomic transition frequency.<n>Recent experiments have advanced the field, but achieving truly continuous operation remains technically challenging.<n>We propose an alternative route to an active optical frequency reference with fewer emitters using a nanophotonic waveguide.
  arXiv  Detail & Related papers  (2026-07-07T17:57:44Z)
• Programmable Superradiance in an Interacting Qubit Array [1.787874547760233]
  Quantum emitters couple to a common electromagnetic environment, interference in their collective radiative dynamics gives rise to superradiance and subradiance.<n>Here, we realize a superconducting qubit array coupled to a common microwave waveguide that mediates collective dissipation.<n>Our results establish a flexible platform for exploring collective phenomena in many-body quantum optics and driven-dissipative approaches to robust quantum information processing.
  arXiv  Detail & Related papers  (2026-05-12T17:36:45Z)
• Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence [0.619788266425984]
  We report the observation of a driven soliton state in epitaxial films of an iron-based superconductor.<n>The transition to this soliton state is marked by the emergence of Floquet-like spectral sidebands.
  arXiv  Detail & Related papers  (2025-07-30T04:55:55Z)
• Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
  We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits. We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
  arXiv  Detail & Related papers  (2024-08-30T15:54:33Z)
• A dissipation-induced superradiant transition in a strontium cavity-QED system [0.0]
  In cavity quantum electrodynamics (QED), emitters and a resonator are coupled together to enable precise studies of quantum light-matter interactions. Here we provide an observation of the continuous superradiant phase transition predicted in the CRF model using an ensemble of ultracold $88$Sr atoms. Our observations are a first step towards finer control of driven-dissipative systems, which have been predicted to generate quantum states.
  arXiv  Detail & Related papers  (2024-08-20T18:00:00Z)
• Quantum Coherence Tomography of Lightwave Controlled Superconductivity [0.06364409691582436]
  Lightwave periodic driving of nearly dissipation-less currents has recently emerged as a universal control concept for superconducting (SC) and topological electronics applications. We report the discovery of lightwave-controlled superconductivity via parametric time-periodic driving of strongly-coupled bands in iron-based superconductors. We are able to measure non-perturbative, high-order correlations in this strongly-driven superconductivity by separating the THz multi-dimensional coherent spectra into conventional pump-probe, Higgs collective mode, and pronounced bi-Higgs frequency sideband peaks with highly nonlinear field dependence.
  arXiv  Detail & Related papers  (2022-07-13T04:31:34Z)
• Frequency combs with parity-protected cross-correlations from dynamically modulated qubit arrays [117.44028458220427]
  We develop a general theoretical framework to dynamically engineer quantum correlations in the frequency-comb emission from an array of superconducting qubits in a waveguide. We demonstrate, that when the resonance of the two qubits are periodically modulated with a $pi$ phase shift, it is possible to realize simultaneous bunching and antibunching in cross-correlations of the scattered photons from different sidebands.
  arXiv  Detail & Related papers  (2022-03-01T13:12:45Z)
• Out-of-time-order correlator in the quantum Rabi model [62.997667081978825]
  We show that out-of-time-order correlator derived from the Loschmidt echo signal quickly saturates in the normal phase. We show that the effective time-averaged dimension of the quantum Rabi system can be large compared to the spin system size.
  arXiv  Detail & Related papers  (2022-01-17T10:56:57Z)
• Chiral Cavity Quantum Electrodynamics [0.0]
  We explore for the first time cavity quantum electrodynamics of a transmon qubit in the topological vacuum of a Harper-Hofstadter topological lattice. We spectroscopically resolve the individual bulk and edge modes of this lattice, detect vacuum-stimulated Rabi oscillations between the excited transmon and each mode, and thereby measure the synthetic-vacuum-induced Lamb shift of the transmon.
  arXiv  Detail & Related papers  (2021-09-09T22:26:36Z)
• Microwave multiphoton conversion via coherently driven permanent dipole systems [68.8204255655161]
  We investigate a leaking single-mode quantized cavity field coupled with a resonantly driven two-level system possessing permanent dipoles. The frequencies of the interacting subsystems are being considered very different, e.g., microwave ranges for the cavity and optical domains for the frequency of the two-level emitter, respectively.
  arXiv  Detail & Related papers  (2020-08-12T16:20:44Z)
• Synchronisation phase as an indicator of persistent quantum correlations between subsystems [68.8204255655161]
  Spontaneous synchronisation is a collective phenomenon that can occur in both dynamical classical and quantum systems. We show that our analysis applies to a variety of spontaneously synchronising open quantum systems.
  arXiv  Detail & Related papers  (2020-06-29T17:21:32Z)
• Theory of waveguide-QED with moving emitters [68.8204255655161]
  We study a system composed by a waveguide and a moving quantum emitter in the single excitation subspace. We first characterize single-photon scattering off a single moving quantum emitter, showing both nonreciprocal transmission and recoil-induced reduction of the quantum emitter motional energy.
  arXiv  Detail & Related papers  (2020-03-20T12:14:10Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.