39 results found
Alauze X, Lim J, Trigatzis MA, et al., 2021, An ultracold molecular beam for testing fundamental physics, QUANTUM SCIENCE AND TECHNOLOGY, Vol: 6, ISSN: 2058-9565
Fitch NJ, Lim J, Hinds EA, et al., 2021, Methods for measuring the electron's electric dipole moment using ultracold YbF molecules, QUANTUM SCIENCE AND TECHNOLOGY, Vol: 6, ISSN: 2058-9565
Ho C, Devlin JA, Rabey I, et al., 2020, New techniques for a measurement of the electron's electric dipole moment, New Journal of Physics, Vol: 22, ISSN: 1367-2630
The electric dipole moment of the electron (eEDM) can be measured with high precision using heavy polar molecules. In this paper, we report on a series of new techniques that have improved the statistical sensitivity of the YbF eEDM experiment. We increase the number of molecules participating in the experiment by an order of magnitude using a carefully designed optical pumping scheme. We also increase the detection efficiency of these molecules by another order of magnitude using an optical cycling scheme. In addition, we show how to destabilise dark states and reduce backgrounds that otherwise limit the efficiency of these techniques. Together, these improvements allow us to demonstrate a statistical sensitivity of 1.8 x 10⁻²⁸ e cm after one day of measurement, which is 1.2 times the shot-noise limit. The techniques presented here are applicable to other high-precision measurements using molecules.
Song Y, Lim J, Ahn J, 2020, Berry-phase gates for fast and robust control of atomic clock states, Physical Review Research, Vol: 2
Song Y, Lim J, Ahn J, 2020, Berry-phase gates for fast and robust control of atomic clock states, Publisher: AMER PHYSICAL SOC
Lim J, Almond J, Trigatzis M, et al., 2018, Laser cooled YbF molecules for measuring the electron's electric dipole moment, Physical Review Letters, Vol: 120, ISSN: 0031-9007
We demonstrate one-dimensional sub-Doppler laser cooling of a beam of YbF molecules to 100 μK. This is a key step towards a measurement of the electron's electric dipole moment using ultracold molecules. We compare the effectiveness of magnetically-assisted and polarization-gradient sub-Doppler cooling mechanisms. We model the experiment and fi nd good agreement with our data.
LIM J, Almond J, Tarbutt MR, et al., 2017, The -X²∑⁺ and - X²∑⁺ bands of ytterbium fluoride,¹⁷⁴YbF, Journal of Molecular Spectroscopy, Vol: 338, Pages: 81-90, ISSN: 1096-083X
The  - X2Σ+(v = 0, 1, 2, 3) and the  - X2Σ+ (v = 2) visible electronic transitions of YbF have been recorded at a near-natural linewidth spectral resolution using both supersonically cooled and buffer-gas cooled beams. The 174YbF isotopologue spectral features were analyzed to produce a new set of spectroscopic parameters for the X2Σ+(v = 2), X2Σ+(v = 3), , and  states. This study will facilitate ongoing work to produce ultracold YbF molecules by laser cooling in order to improve measurements of the electron’s electric dipole moment.
Lim J, Frye MD, Hutson JM, et al., 2015, Modeling sympathetic cooling of molecules by ultracold atoms, Physical Review A, Vol: 92, ISSN: 1094-1622
We model sympathetic cooling of ground-state CaF molecules by ultracold Li and Rb atoms. The molecules are moving in a microwave trap, while the atoms are trapped magnetically. We calculate the differential elastic cross sections for CaF-Li and CaF-Rb collisions, using model Lennard-Jones potentials adjusted to give typical values for the s-wave scattering length. Together with trajectory calculations, these differential cross sections are used to simulate the cooling of the molecules, the heating of the atoms, and the loss of atoms from the trap. We show that a hard-sphere collision model based on an energy-dependent momentum transport cross section accurately predicts the molecule cooling rate but underestimates the rates of atom heating and loss. Our simulations suggest that Rb is a more effective coolant than Li for ground-state molecules, and that the cooling dynamics is less sensitive to the exact value of the s-wave scattering length when Rb is used. Using realistic experimental parameters, we find that molecules can be sympathetically cooled to 100μK in about 10 s. By applying evaporative cooling to the atoms, the cooling rate can be increased and the final temperature of the molecules can be reduced to 1 μK within 30 s.
Kim H, Lee H-G, Lim J, et al., 2014, Optimal Pulse Shaping for Ultrafast Laser Interaction with Quantum Systems, Progress in Ultrafast Intense Laser Science XI, Publisher: Springer, ISBN: 9783319067315
We are pleased to present the eleventh volume of Progress in Ultrafast Intense Laser Science. As the frontiers of ultrafast intense laser science rapidly expand ever outward, there continues to be a growing demand for an introduction to this ...
Lim J, Lee H-G, Lee S, et al., 2014, Ultrafast Ramsey interferometry to implement cold atomic qubit gates, SCIENTIFIC REPORTS, Vol: 4, ISSN: 2045-2322
Lee H-G, Kim H, Lim J, et al., 2013, Quantum interference control of a four-level diamond-configuration quantum system, PHYSICAL REVIEW A, Vol: 88, ISSN: 1050-2947
Lee K, Lim J, Ahn J, 2013, Young's experiment with a double slit of sub-wavelength dimensions, OPTICS EXPRESS, Vol: 21, Pages: 18805-18811, ISSN: 1094-4087
Lim J, Lee H-G, Ahn J, 2013, Review of cold Rydberg atoms and their applications, JOURNAL OF THE KOREAN PHYSICAL SOCIETY, Vol: 63, Pages: 867-876, ISSN: 0374-4884
Lee S, Lee H-G, Cho J, et al., 2012, Coherent control of multiphoton-ionization passage of excited-state rubidium atoms, PHYSICAL REVIEW A, Vol: 86, ISSN: 1050-2947
Lim J, Lee K, Ahn J, 2012, Ultrafast Rabi flopping in a three-level energy ladder, OPTICS LETTERS, Vol: 37, Pages: 3378-3380, ISSN: 0146-9592
Ahn J, Lee K, Yi M, et al., 2011, Device for terahertz emitter using thin indium arsenic film optical fiber and manufacturing method thereof, Korea Patent 10-1067368
Lim J, Lee H-G, Lee S, et al., 2011, Quantum control in two-dimensional Fourier-transform spectroscopy, PHYSICAL REVIEW A, Vol: 84, ISSN: 1050-2947
Lim J, Lee H-G, Kim J-U, et al., 2011, Coherent transients mimicked by two-photon coherent control of a three-level system, PHYSICAL REVIEW A, Vol: 83, ISSN: 1050-2947
Lee S, Lim J, Park CY, et al., 2011, Strong-field quantum control of 2+1 photon absorption of atomic sodium, OPTICS EXPRESS, Vol: 19, Pages: 2266-2277, ISSN: 1094-4087
Lee S, Lim J, Ahn J, 2011, Strong-Field Quantum Control of Energy Ladder Climbing, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Lim J, Lee H-G, Lee S, et al., 2011, Quantum Control of Two-photon Inter-excited States Transitions, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Lim J, Kim J-U, Lee H-G, et al., 2011, Coherent Control in 2D Fourier Transform Optical Spectroscopy, Nonlinear Optics: Materials, Fundamentals and Applications, Publisher: OSA
Lee S, Lim J, Ahn J, 2011, Quantum Control of Strong-Field Ladder Climbing in Atomic Sodium, High Intensity Lasers and High Field Phenomena, Publisher: OSA
Lee S, Lim J, Ahn J, et al., 2010, Strong-field two-photon transition by phase shaping, PHYSICAL REVIEW A, Vol: 82, ISSN: 1050-2947
Jang K-J, Lim J, Ahn J, et al., 2010, Ultrafast near-infrared spectroscopic study of coherent phonons in the phase-separated manganite La1/4Pr3/8Ca3/8MnO3, PHYSICAL REVIEW B, Vol: 81, ISSN: 1098-0121
Jang K-J, Lim J, Ahn J, et al., 2010, Ultrafast IR spectroscopic study of coherent phonons and dynamic spin-lattice coupling in multiferroic LuMnO3, NEW JOURNAL OF PHYSICS, Vol: 12, ISSN: 1367-2630
Lim J, Lee H-G, Lee S, et al., 2010, Coherent Control of Wavefunctions in 2D Fourier Transform Optical Spectroscopy, Conference on Lasers and Electro-Optics (CLEO)/Quantum Electronics and Laser Science Conference (QELS), Publisher: IEEE
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