Self-Ordering, Cooling and Lasing in an Ensemble of Clock Atoms

• URL: http://arxiv.org/abs/2407.16046v1
• Date: Mon, 22 Jul 2024 20:54:03 GMT
• Title: Self-Ordering, Cooling and Lasing in an Ensemble of Clock Atoms
• Authors: Anna Bychek, Laurin Ostermann, Helmut Ritsch,
• Abstract summary: Active atomic clocks are predicted to provide better short-term stability and robustness against thermal fluctuations than typical feedback-based optical atomic clocks. We study spatial self-organization in a transversely driven ensemble of clock atoms inside an optical resonator and coherent light emission from the cavity.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Active atomic clocks are predicted to provide far better short-term stability and robustness against thermal fluctuations than typical feedback-based optical atomic clocks. However, continuous laser operation using an ensemble of clock atoms still remains an experimentally challenging task. We study spatial self-organization in a transversely driven ensemble of clock atoms inside an optical resonator and coherent light emission from the cavity. We focus on the spectral properties of the emitted light in the narrow atomic linewidth regime, where the phase coherence providing frequency stability is stored in the atomic dipoles rather than the cavity field. The atoms are off-resonantly driven by a standing-wave coherent laser transversely to the cavity axis allowing for atomic motion along the cavity axis as well as along the pump. In order to treat larger atom numbers we employ a second-order cumulant expansion which allows us to calculate the spectrum of the cavity light field. We identify the self-organization threshold where the atoms align themselves in a checkerboard pattern thus maximizing light scattering into the cavity which simultaneously induces cooling. For a larger driving intensity, more atoms are transferred to the excited state, reducing cooling but increasing light emission from the excited atoms. This can be enhanced via a second cavity mode at the atomic frequency spatially shifted by a quarter wavelength. For large enough atom numbers we observe laser-like emission close to the bare atomic transition frequency.

Related papers

• Correlated relaxation and emerging entanglement in arrays of $Λ$-type atoms [83.88591755871734]
  We show that the atomic entanglement emerges in the course of relaxation and persists in the final steady state of the system. Our findings open a new way to engineer dissipation-induced entanglement.
  arXiv  Detail & Related papers  (2024-11-11T08:39:32Z)
• A superradiant two-level laser with intrinsic light force generated gain [0.0]
  We propose a new scenario for creating continuous gain by using optical forces acting on the states of a two-level atom. We study minimal conditions on pump laser intensities and detunings required for collective superradiant emission.
  arXiv  Detail & Related papers  (2023-04-25T23:10:55Z)
• Correlated steady states and Raman lasing in continuously pumped and probed atomic ensembles [68.8204255655161]
  We consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser.
  arXiv  Detail & Related papers  (2022-05-10T06:54:54Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• Collective emission of an atomic beam into an off-resonant cavity mode [1.5749416770494706]
  We study the collective emission of a beam of atomic dipoles into an optical cavity. By developing a theoretical description of the coupled atom-cavity dynamics we analyze the stationary atomic configurations. We find that the pulling is small if the cavity linewidth is much larger than the collective linewidth of the atomic beam.
  arXiv  Detail & Related papers  (2021-07-12T18:06:25Z)
• 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)
• Multimode-polariton superradiance via Floquet engineering [55.41644538483948]
  We consider an ensemble of ultracold bosonic atoms within a near-planar cavity, driven by a far detuned laser. We show that a strong, dispersive atom-photon coupling can be reached for many transverse cavity modes at once. The resulting Floquet polaritons involve a superposition of a set of cavity modes with a density of excitation of the atomic cloud.
  arXiv  Detail & Related papers  (2020-11-24T19:00:04Z)
• Position-controlled quantum emitters with reproducible emission wavelength in hexagonal boron nitride [45.39825093917047]
  Single photon emitters (SPEs) in low-dimensional layered materials have recently gained a large interest owing to the auspicious perspectives of integration and extreme miniaturization. Here, we evidence SPEs in high purity synthetic hexagonal boron nitride (hBN) that can be activated by an electron beam at chosen locations. Our findings constitute an essential step towards the realization of top-down integrated devices based on identical quantum emitters in 2D materials.
  arXiv  Detail & Related papers  (2020-11-24T17:20:19Z)
• Collective spontaneous emission of two entangled atoms near an oscillating mirror [50.591267188664666]
  We consider the cooperative spontaneous emission of a system of two identical atoms, interacting with the electromagnetic field in the vacuum state. Using time-dependent theory, we investigate the spectrum of the radiation emitted by the two-atom system. We show that it is modulated in time, and that the presence of the oscillating mirror can enhance or inhibit the decay rate.
  arXiv  Detail & Related papers  (2020-10-07T06:48:20Z)
• Collective emission of photons from dense, dipole-dipole interacting atomic ensembles [0.0]
  We study the collective radiation properties of cold, trapped ensembles of atoms. We find that the emission rate of a photon from an excited atomic ensemble is strongly enhanced for an elongated cloud.
  arXiv  Detail & Related papers  (2020-09-18T06:44:02Z)
• Regular and bistable steady-state superradiant phases of an atomic beam traversing an optical cavity [1.3854111346209868]
  We investigate the different photon emission regimes created by a preexcited and collimated atomic beam passing through a single mode of an optical cavity. We analyze the different superradiant regimes and the quantum critical crossover boundaries.
  arXiv  Detail & Related papers  (2020-09-11T20:31:52Z)

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.