Related papers: Efficient Three-Dimensional Sub-Doppler Cooling of $^{40}$Ca$^+$ in a Penning Trap

Efficient Three-Dimensional Sub-Doppler Cooling of $^{40}$Ca$^+$ in a Penning Trap

URL: http://arxiv.org/abs/2602.02937v1
Date: Tue, 03 Feb 2026 00:14:50 GMT
Title: Efficient Three-Dimensional Sub-Doppler Cooling of $^{40}$Ca$^+$ in a Penning Trap
Authors: Brian J. McMahon, Brian C. Sawyer,
Abstract summary: We demonstrate efficient sub-Doppler laser cooling of an ion confined in a Penning trap operating with a magnetic field of 0.91 T.<n>The process achieves a 1/e cooling time constant of 108(8) $$s, reducing the mean thermal axial mode occupation from 72(23) to 1.5(3) in 800 $$s.<n>This sub-Doppler cooling is achieved for an axial oscillation frequency of $_z = 2times$221 kHz, which places the motion well outside of the Lamb Dicke confinement regime at the Doppler laser cooling limit.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We demonstrate efficient sub-Doppler laser cooling of the three eigenmodes of a $^{40}$Ca$^+$ ion confined in a compact Penning trap operating with a magnetic field of 0.91 T. Using the same set of laser beams as required for the initial Doppler laser cooling operation, we detune the laser frequencies to produce a narrow two-photon dark resonance. The process achieves a 1/e cooling time constant of 108(8) $μ$s, ultimately reducing the mean thermal axial mode occupation from 72(23) to 1.5(3) in 800 $μ$s as measured by resonantly probing an electric quadrupole transition near 729 nm. A parametric drive is applied to the trap electrodes which coherently exchanges the axial mode occupation with that of each radial mode, allowing for three-dimensional sub-Doppler cooling using only the axially-propagating laser beams. This sub-Doppler cooling is achieved for an axial oscillation frequency of $ω_z = 2π~\times~$221 kHz, which places the motion well outside of the Lamb Dicke confinement regime at the Doppler laser cooling limit. Our measured cooling rate and final mode occupation are in good agreement with a semiclassical model which combines a Lindblad master equation solution for ion-photon interactions with classical harmonic oscillator motion of the trapped ion.

Related papers

Sub-Doppler cooling of a trapped ion in a phase-stable polarization gradient [1.251345045672431]
Trapped ions provide a highly controlled platform for quantum sensors, clocks, simulators, and computers. We demonstrate cooling of a trapped ion below the Doppler limit using a phase-stable polarization gradient created using trap-integrated photonic devices.
arXiv Detail & Related papers (2024-11-09T01:05:17Z)
High-performance in-vacuum optical system for quantum optics experiments in a Penning-trap [0.0]
We present a new in-vacuum optical system designed to detecting 397-nm fluorescence photons from individual calcium ions and Coulomb crystals. The system has been characterized using a single laser-cooled ion as a point-like source, reaching a final resolution of 3.69(3) $mu$m.
arXiv Detail & Related papers (2024-06-11T10:57:27Z)
Cavity-enhanced detection of spin polarization in a microfabricated atomic vapor cell [0.0]
We demonstrate continuous Pound-Drever-Hall (PDH) nondestructive monitoring of the electron spin polarization of an atomic vapor in a microfabricated vapor cell within an optical resonator.
arXiv Detail & Related papers (2023-12-19T15:39:37Z)
An anti-maser for quantum-limited cooling of a microwave cavity [58.720142291102135]
We experimentally demonstrate how to generate a state in condensed matter at moderate cryogenic temperatures. This state is then used to efficiently remove microwave photons from a cavity. Such an "anti-maser" device could be extremely beneficial for applications that would normally require cooling to millikelvin temperatures.
arXiv Detail & Related papers (2023-07-24T11:12:29Z)
Quantum field heat engine powered by phonon-photon interactions [58.720142291102135]
We present a quantum heat engine based on a cavity with two oscillating mirrors. The engine performs an Otto cycle during which the walls and a field mode interact via a nonlinear Hamiltonian.
arXiv Detail & Related papers (2023-05-10T20:27:15Z)
Quantum-limited millimeter wave to optical transduction [50.663540427505616]
Long distance transmission of quantum information is a central ingredient of distributed quantum information processors. Current approaches to transduction employ solid state links between electrical and optical domains. We demonstrate quantum-limited transduction of millimeter-wave (mmwave) photons into optical photons using cold $85$Rb atoms as the transducer.
arXiv Detail & Related papers (2022-07-20T18:04:26Z)
$\Lambda$-enhanced gray molasses in a tetrahedral laser beam geometry [0.0]
We report observation of sub-Doppler cooling of lithium using an irregular-tetrahedral laser beam arrangement. We capture 11(2) % of the lithium atoms from a grating magneto-optical trap into gray molasses. Our results show that grating magneto-optical traps can serve as a robust source of cold atoms for tweezer-array and atom-chip experiments.
arXiv Detail & Related papers (2021-10-06T20:52:45Z)
139 GHz UV phase-locked Raman laser system for thermometry and sideband cooling of $^9$Be$^+$ ions in a Penning trap [0.0]
We demonstrate phase locking of two ultraviolet laser sources by modulating a fundamental infrared laser with 4th-order sidebands. The phase lock at 139 GHz is confirmed through stimulated Raman transitions for thermometry of $9$Be$+$ ions confined in a cryogenic Penning trap. This technique might be used for sideband cooling of single $9$Be$+$ ions as well as sympathetic cooling schemes and quantum logic based measurements in Penning traps in the future.
arXiv Detail & Related papers (2021-06-25T09:56:15Z)
Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic [52.77024349608834]
We introduce a novel algorithmic cooling protocol for transferring phonons from poorly- to efficiently-cooled modes. We demonstrate it experimentally by simultaneously bringing two motional modes of a Be$+$-Ar$13+$ mixed Coulomb crystal close to their zero-point energies. We reach the lowest temperature reported for a highly charged ion, with a residual temperature of only $Tlesssim200mathrmmu K$ in each of the two modes.
arXiv Detail & Related papers (2021-02-24T17:46:15Z)
Photon-mediated entanglement scheme between a ZnO semiconductor defect and a trapped Yb ion [58.720142291102135]
We propose an optical scheme to generate an entangled state between a trapped ion and a solid state donorbit. We show that an entanglement rate of 21 kHz and entanglement fidelity of 94 % can be attained using a weak scheme with reasonable parameters.
arXiv Detail & Related papers (2020-06-25T22:58:54Z)
Resonant high-energy bremsstrahlung of ultrarelativistic electrons in the field of a nucleus and a pulsed light wave [68.8204255655161]
Research investigates the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies in the field of a nucleus and a quasimonochromatic laser wave.
arXiv Detail & Related papers (2020-04-05T16:27:11Z)

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