Cavity Sub- and Superradiance Enhanced Ramsey Spectroscopy

• URL: http://arxiv.org/abs/2201.09731v1
• Date: Fri, 21 Jan 2022 14:57:35 GMT
• Title: Cavity Sub- and Superradiance Enhanced Ramsey Spectroscopy
• Authors: Christoph Hotter, Laurin Ostermann and Helmut Ritsch
• Abstract summary: Ramsey spectroscopy in large, dense ensembles of ultra-cold atoms trapped in optical lattices suffers from dipole-dipole interaction induced shifts and collective superradiance limiting its precision and accuracy. We propose a novel geometry implementing fast signal readout with minimal heating for large atom numbers at lower densities via an optical cavity operated in the weak single atom but strong collective coupling regime.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Ramsey spectroscopy in large, dense ensembles of ultra-cold atoms trapped in optical lattices suffers from dipole-dipole interaction induced shifts and collective superradiance limiting its precision and accuracy. We propose a novel geometry implementing fast signal readout with minimal heating for large atom numbers at lower densities via an optical cavity operated in the weak single atom but strong collective coupling regime. The key idea is controlled collective transverse $\pi/2$-excitation of the atoms to prepare a macroscopic collective spin protected from cavity superradiance. This requires that the two halves of the atomic ensemble are coupled to the cavity mode with opposite phase, which is naturally realized for a homogeneously filled volume covering odd and even sites of the cavity mode along the cavity axis. The origin of the superior precision can be traced back to destructive interference among sub-ensembles in the complex nonlinear collective atom field dynamics. In the same configuration we find surprising regular self-pulsing of the cavity output for suitable continuous illumination. Our simulations for large atom numbers employing a cumulant expansion are qualitatively confirmed by a full quantum treatment of smaller ensembles.

Related papers

• Continuous cavity-QED with an atomic beam [4.318157997343946]
  Atoms coupled to cavities provide an exciting playground for the study of fundamental interactions of atoms mediated through a common channel. Many of the applications of cavity-QED and cold-atom experiments more broadly, suffer from limitations caused by the transient nature of an atomic loading cycle. We present a machine designed to produce a continuous flux of collimated atoms that traverse an optical cavity.
  arXiv  Detail & Related papers  (2024-07-26T11:13:53Z)
• Stability and decay of subradiant patterns in a quantum gas with photon-mediated interactions [34.82692226532414]
  We study subradiance in a Bose-Einstein condensate positioned at the mode crossing of two optical cavities. metastable density structures that suppress emission into one cavity mode prevent relaxation to the stationary, superradiant grating. We reproduce these dynamics by a quantum mean field model, suggesting that subradiance shares characteristics with quasi-stationary states predicted in other long-range interacting systems.
  arXiv  Detail & Related papers  (2024-07-12T12:47:07Z)
• Strongly subradiant states in planar atomic arrays [39.58317527488534]
  We study collective dipolar oscillations in finite planar arrays of quantum emitters in free space. We show that the external coupling between the collective states associated with the symmetry of the array and with the quasi-flat dispersion of the corresponding infinite lattice plays a crucial role in the boost of their radiative lifetime.
  arXiv  Detail & Related papers  (2023-10-10T17:06:19Z)
• Collectively enhanced Ramsey readout by cavity sub- to superradiant transition [0.0]
  We experimentally confirm a minimum threshold for superradiant emission on a narrow optical transition. A $pi/2$-pulse places the atoms in a subradiant state, protected from collective cavity decay. The scheme is a fundamentally new approach to atomic state readout characterized by its speed, simplicity, and high sensitivity.
  arXiv  Detail & Related papers  (2023-06-21T20:18:28Z)
• Characterizing superradiant dynamics in atomic arrays via a cumulant expansion approach [0.0]
  Ordered atomic arrays with subwavelength lattice spacing emit light collectively. For fully inverted atomic arrays, this results in an initial burst of radiation and a fast build up of coherences between the atoms at initial times. We benchmark the cumulant expansion approach and show that it correctly captures the cooperative dynamics resulting in superradiance.
  arXiv  Detail & Related papers  (2022-11-21T22:49:21Z)
• Engineering random spin models with atoms in a high-finesse cavity [8.787025970442755]
  We realise an all-to-all interacting, disordered spin system by subjecting an atomic cloud in a cavity to a controllable light shift. By probing the low-energy excitations of the system, we explore the competition of interactions with disorder across a broad parameter range. Results present significant steps towards freely programmable cavity-mediated interactions for the design of arbitrary spin Hamiltonians.
  arXiv  Detail & Related papers  (2022-08-19T16:13:58Z)
• Superradiant lasing in inhomogeneously broadened ensembles with spatially varying coupling [0.0]
  We study the power, linewidth and lineshifts of such a superradiant laser as a function of the inhomogeneous width of the ensemble. We present conditions on the atom numbers, the pump and coupling strengths required to reach the buildup of collective atomic coherence as well as scaling and limitations for the achievable laser linewidth.
  arXiv  Detail & Related papers  (2021-05-23T21:28:23Z)
• Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity [47.187609203210705]
  Hybrid quantum photonics with SiV$-$-containing nanodiamonds inside one hole of a one-dimensional, free-standing, Si$_3$N$_4$-based photonic crystal cavity is presented. The resulting photon flux is increased by more than a factor of 14 as compared to free-space. Results mark an important step to realize quantum network nodes based on hybrid quantum photonics with SiV$-$- center in nanodiamonds.
  arXiv  Detail & Related papers  (2020-12-21T17:22:25Z)
• Deterministic single-atom source of quasi-superradiant $N$-photon pulses [62.997667081978825]
  Scheme operates with laser and cavity fields detuned from the atomic transition by much more than the excited-state hyperfine splitting. This enables reduction of the dynamics to that of a simple, cavity-damped Tavis-Cummings model with the collective spin determined by the total angular momentum of the ground hyperfine level.
  arXiv  Detail & Related papers  (2020-12-01T03:55:27Z)
• Parallel dark soliton pair in a bistable 2D exciton-polariton superfluid [47.187609203210705]
  2D dark solitons are unstable and collapse into vortices due to snake instabilities. We demonstrate that a pair of dark solitons can be formed in the wake of an obstacle in a polariton flow resonantly supported by a homogeneous laser beam.
  arXiv  Detail & Related papers  (2020-03-25T13:52:22Z)
• Non-reciprocal Cavity Polariton with Atoms Strongly Coupled to Optical Cavity [21.013802417752025]
  We experimentally demonstrate a chiral cavity QED system with multiple atoms strongly coupled to a Fabry-Perot cavity. By polarizing the internal quantum state of the atoms, the time-reversal symmetry of the atom-cavity interaction is broken. The strongly coupled atom-cavity system can be described by non-reciprocal quasiparticles, i.e., the cavity polariton.
  arXiv  Detail & Related papers  (2019-11-23T02:32:21Z)

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.