Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Spontaneously Squeezing Superradiant Laser

Da-Wu Xiao, Chong Chen, Ren‐Bao Liu

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We investigate a superradiant lasing system with atom-atom interaction. We find that this interaction induces a squeezed lasing phase, demonstrating the importance of coherent many-body interactions in lasing.
DOI
10.1364/cleo_fs.2024.fw4j.7

Related papers

Squeezed superradiant lasing of a quantum many-body emitter

Da-Wu Xiao, Chong Chen, Ren-Bao Liu

In conventional lasers, the emitters are typically incoherent, radiating photons independently; in superradiant lasers, many coherent emitters radiate photons collectively, but they essentially do not interact with each other. Here, we present the concept of quantum many-body lasers, in which the emitters interact coherently and radiate collectively. In this proof-of-concept study, we consider a cavity coupled to many pumped spin-1/2 emitters with all-to-all interaction. We find that the squeezing induced by the coherent many-body interaction can be transferred from the spins to photons through superradiant lasing. This work illustrates the concept of using a pumped quantum many-body system to generate bright quantum light with quantum correlations beyond conventional optical coherence, which can facilitate quantum technologies and the study of nonlinear optics in the quantum realm.

quant-pharXiv:2602.16215•Feb 19, 2026•0 citations

Thresholdless Superradiance Laser

Kyungwon An

We present a thresholdless laser by time-separated coherent superradiance. Contrary to the conventional approach of maximizing the beta factor, we utilized collective interaction of phase-aligned atomic dipoles in a high-Q cavity to achieve thresholdless lasing.

Optica Laser Congress (ASSL, LAC, LS&C)•Jan 1, 2018•0 citations

Thresholdless Lasing in Single-Atom Superradiance

Kyungwon An

Contrary to the conventional approach of maximizing the so-called beta factor for thresholdless lasing, we utilized collective interaction of phase-aligned atomic dipoles in a high-Q cavity to demonstrate thresholdless lasing even with a beta factor of 0.03 in the setting of the single-atom superradiance.

IEEE/LEOS Summer Topical Meetings•Jul 1, 2018•0 citations

A Superradiant Laser and Spin Squeezed States: Collective Phenomena in a Rubidium Cavity QED System for Enhancing Precision Measurements

Justin Bohnet

By allowing a large ensemble of laser cooled and trapped 87Rb atoms to interact collectively with an optical cavity, I have explored two phenomena that may prove useful for enhancing precision measurements: superradiant lasing and spin squeezing.\nSuperradiant lasers have been proposed as future ultrastable optical frequency references, with predicted linewidths < 1 millihertz. These lasers operate in an unusual regime of laser physics where collective emission from an atomic ensemble maps the quantum phase stored in the atoms onto the optical cavity field. I will give an overview of my experimental work using a cold-atom, superradiant Raman laser as a model system to confirm a number of the key predictions concerning superradiant lasing, including the possibility of coherent emission with < 1 intracavity photon on average and greatly reduced sensitivity to cavity frequency noise.\nI also present work using cavity-aided, coherence-preserving measurements of the atomic state population to create entanglement between atoms. The entanglement enables more precise estimation of the quantum phase at the heart of nearly all precision measurements and sensors utilizing quantum objects. By utilizing a cycling transition for the quantum non-demolition probe, we have reduced by several orders of magnitude the measurement induced back-action caused by spontaneous Raman transitions. We directly observe, with no background subtraction, a spin squeezed state with sensitivity to measuring a quantum phase enhanced 10.5 times in variance (i.e. 10.2 dB) beyond the standard quantum limit for an unentangled state. This experimental breakthrough demonstrates that quantum-aided sensing techniques can realize large enough enhancements to have a substantial impact on precision measurements and may aid advances in technology as well as searches for new physics.

•Jan 1, 2014•1 citation

Photon statistics and emission spectrum of single-atom superradiance

Kyungwon

We have investigated the photon statistics as well as the spectrum of the output emission from an atom-cavity system made of a small number of phase-correlated atoms undergoing superradiant lasing in a high-Q cavity.

International Conference on Transparent Optical Networks•Jul 6, 2025•0 citations

Squeezed state in superradiance

Qiao Gu

It has been shown recently that superradiance from N two-level atoms interacting with a single-mode field produces a squeezed field,1 but the analytical expression for field dispersion has not been given.

•Apr 26, 1987•0 citations
In conventional lasers, the emitters are typically incoherent, radiating photons independently; in superradiant lasers, many coherent emitters radiate photons collectively, but they essentially do not interact with each other. Here, we present the concept of quantum many-body lasers, in which the emitters interact coherently and radiate collectively. In this proof-of-concept study, we consider a cavity coupled to many pumped spin-1/2 emitters with all-to-all interaction. We find that the squeezing induced by the coherent many-body interaction can be transferred from the spins to photons through superradiant lasing. This work illustrates the concept of using a pumped quantum many-body system to generate bright quantum light with quantum correlations beyond conventional optical coherence, which can facilitate quantum technologies and the study of nonlinear optics in the quantum realm.
By allowing a large ensemble of laser cooled and trapped 87Rb atoms to interact collectively with an optical cavity, I have explored two phenomena that may prove useful for enhancing precision measurements: superradiant lasing and spin squeezing.\nSuperradiant lasers have been proposed as future ultrastable optical frequency references, with predicted linewidths < 1 millihertz. These lasers operate in an unusual regime of laser physics where collective emission from an atomic ensemble maps the quantum phase stored in the atoms onto the optical cavity field. I will give an overview of my experimental work using a cold-atom, superradiant Raman laser as a model system to confirm a number of the key predictions concerning superradiant lasing, including the possibility of coherent emission with < 1 intracavity photon on average and greatly reduced sensitivity to cavity frequency noise.\nI also present work using cavity-aided, coherence-preserving measurements of the atomic state population to create entanglement between atoms. The entanglement enables more precise estimation of the quantum phase at the heart of nearly all precision measurements and sensors utilizing quantum objects. By utilizing a cycling transition for the quantum non-demolition probe, we have reduced by several orders of magnitude the measurement induced back-action caused by spontaneous Raman transitions. We directly observe, with no background subtraction, a spin squeezed state with sensitivity to measuring a quantum phase enhanced 10.5 times in variance (i.e. 10.2 dB) beyond the standard quantum limit for an unentangled state. This experimental breakthrough demonstrates that quantum-aided sensing techniques can realize large enough enhancements to have a substantial impact on precision measurements and may aid advances in technology as well as searches for new physics.