ORCID Profile
0000-0002-6290-9354
Current Organisation
Australian National University
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Publisher: Springer Science and Business Media LLC
Date: 19-10-2018
DOI: 10.1038/S41467-018-06847-1
Abstract: Machine learning based on artificial neural networks has emerged as an efficient means to develop empirical models of complex systems. Cold atomic ensembles have become commonplace in laboratories around the world, however, many-body interactions give rise to complex dynamics that preclude precise analytic optimisation of the cooling and trapping process. Here, we implement a deep artificial neural network to optimise the magneto-optic cooling and trapping of neutral atomic ensembles. The solution identified by machine learning is radically different to the smoothly varying adiabatic solutions currently used. Despite this, the solutions outperform best known solutions producing higher optical densities.
Publisher: Wiley
Date: 30-04-2019
Publisher: American Vacuum Society
Date: 11-05-2022
DOI: 10.1116/5.0086507
Abstract: We use a machine learning optimizer to increase the number of rubidium-87 atoms trapped in an optical nanofiber-based two-color evanescent dipole trap array. Collisional blockade limits the average number of atoms per trap to about 0.5, and a typical uncompensated rubidium trap has even lower occupancy due to challenges in simultaneously cooling atoms and loading them in the traps. Here, we report on the implementation of an in-loop stochastic artificial neural network machine learner to optimize this loading by optimizing the absorption of a near-resonant, nanofiber-guided, probe beam. By giving the neural network control of the laser cooling process, we observe an increase in peak optical depth of 66% from 3.2 ± 0.2 to 5.3 ± 0.3. We use a microscopic model of the atomic absorption to infer an increase in the number of dipole-trapped atoms from 300 ± 60 to 450 ± 90 and a small decrease in their average temperature from 150 to 140 μK. The machine learner is able to quickly and effectively explore the large parameter space of the laser cooling control process so as to find optimal parameters for loading the dipole traps. The increased number of atoms should facilitate studies of collective atom–light interactions mediated via the evanescent field.
Publisher: IOP Publishing
Date: 06-2020
Abstract: Light guided by an optical nanofibre has a very steep evanescent field gradient extending from the fibre surface. This gradient can be exploited to drive electric quadrupole transitions in nearby quantum emitters. In this paper, we report on the observation of the 5S 1/2 → 4D 3/2 electric quadrupole transition at 516.6 nm (in vacuum) in laser-cooled 87 Rb atoms using only a few μ W of laser power propagating through an optical nanofibre embedded in the atom cloud. This work extends the range of applications for optical nanofibres in atomic physics to include more fundamental tests such as high-precision measurements of parity non-conservation.
Publisher: Optica Publishing Group
Date: 28-09-2023
Publisher: The Optical Society
Date: 05-2018
DOI: 10.1364/OE.26.012424
Publisher: American Physical Society (APS)
Date: 28-12-2018
Publisher: MyJove Corporation
Date: 11-11-2013
DOI: 10.3791/50552
Publisher: The Optical Society
Date: 15-01-2016
Publisher: Optica Publishing Group
Date: 28-09-2023
Publisher: Springer Science and Business Media LLC
Date: 10-12-2015
DOI: 10.1038/SREP17633
Abstract: Optical resonance is central to a wide range of optical devices and techniques. In an optical cavity, the round-trip length and mirror reflectivity can be chosen to optimize the circulating optical power, linewidth and free-spectral range (FSR) for a given application. In this paper we show how an atomic spinwave system, with no physical mirrors, can behave in a manner that is analogous to an optical cavity. We demonstrate this similarity by characterising the build-up and decay of the resonance in the time domain and measuring the effective optical linewidth and FSR in the frequency domain. Our spinwave is generated in a 20 cm long Rb gas cell, yet it facilitates an effective FSR of 83 kHz, which would require a round-trip path of 3.6 km in a free-space optical cavity. Furthermore, the spinwave coupling is controllable enabling dynamic tuning of the effective cavity parameters.
Publisher: IOP Publishing
Date: 17-07-2017
Publisher: American Physical Society (APS)
Date: 14-02-2020
Publisher: Springer Science and Business Media LLC
Date: 26-09-2016
DOI: 10.1038/NPHYS3901
Location: Japan
No related grants have been discovered for Jesse Llewellyn Everett.