Direct Laser Cooling of a Symmetric Top Molecule

Mitra, Debayan; Vilas, Nathaniel B.; Hallas, Christian; Anderegg, Loïc; Augenbraun, Benjamin L.; Baum, Louis; Miller, Calder; Raval, Shivam; Doyle, John M.

doi:10.48550/arxiv.2004.02848

Cited by 6 publications

(10 citation statements)

References 56 publications

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“…We will not go into the details of the idea, or experimental implementation [9, 10, 58, 59, 60, 61, 62], largely because the solutions are quite general. However, we will point out that non-linear molecules present additional challenges due to their more complex rotational structure, though these challenges can be addressed as well [48,21,63].…”

Section: Metalmentioning

confidence: 99%

“…The diatomic molecules YbF [33] and BaH [68] have been laser-cooled, but not yet trapped. Laser-cooled polyatomic molecules include SrOH [49], CaOH [69], YbOH [56], and CaOCH 3 [63], with a large number of proposed other species which could be cooled using these methods [21, 45,47,48,52,53,54]. Even in the short time that these systems have been available, many advanced cooling and trapping methods have been implemented such as magnetic trapping [10, 70,71], optical trapping [72], application of spontaneous forces [38], tweezer trapping [73], and a variety of sub-Doppler cooling methods [49,63,66,56,71,72,74,75] to reach temperatures as low as 5 µK.…”

Section: Metalmentioning

confidence: 99%

“…CaOCH 3 ) can be turned into a chiral molecule by substituting for example CHDT, and such molecules offer the possibility of laser cooling as well [21,45,151]. The recent demonstration of laser-cooled CaOCH 3 [63] is an important step toward potentially realizing sensitive measurements in ultracold chiral molecules.…”

Section: 21mentioning

confidence: 99%

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Polyatomic Molecules as Quantum Sensors for Fundamental Physics

Hutzler

2020

Preprint

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Precision measurements in molecules have advanced rapidly in recent years through developments in techniques to cool, trap, and control. The complexity of molecules makes them a challenge to study, but also offers opportunities for enhanced sensitivity to many interesting effects. Polyatomic molecules offer additional complexity compared to diatomic molecules, yet are still "simple" enough to be lasercooled and controlled. While laser cooling molecules is still a research frontier itself, there are many proposed and ongoing experiments seeking to combine the advanced control enabled by ultracold temperatures with the intrinsic sensitivity of molecules. In this perspective, we discuss some applications where laser-cooled polyatomic molecules may offer advantages for precision measurements of fundamental physics, both within and beyond the Standard Model.

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Section: Metalmentioning

confidence: 99%

Section: Metalmentioning

confidence: 99%

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Polyatomic Molecules as Quantum Sensors for Fundamental Physics

Hutzler

2020

Preprint

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“…For many tasks, such as fluorescent detection and laser cooling [1,2], it is necessary to simultaneously address these closely-spaced transitions in order to cycle photons. This becomes challenging when the number of desired frequencies is large, a situation that arises in complex molecules [3,4] and atoms in large magnetic fields [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesizing Optical Spectra using Computer-Generated Holography Techniques

Holland,

Lu,

Cheuk

2020

Preprint

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Experimental control and detection of atoms and molecules often rely on optical transitions between different electronic states. In many cases, substructure such as hyperfine or spin-rotation structure leads to the need for multiple optical frequencies spaced by MHz to GHz. The task of creating multiple optical frequencies -optical spectral engineering -becomes challenging when the number of frequencies becomes large, a situation that one could encounter in complex molecules and atoms in large magnetic fields. In this work, we present a novel method to synthesize arbitrary optical spectra by modulating a monochromatic light field with a time-dependent phase generated through computer-generated holography techniques. Our method is compatible with non-linear optical processes such as sum frequency generation and second harmonic generation. Additional requirements that arise from the finite lifetimes of excited states can also be satisfied in our approach. As a proof-of-principle demonstration, we generate spectra suitable for cycling photons on the X-B transition in CaF, and verify via Optical Bloch Equation simulations that one can achieve high photon scattering rates, which are important for fluorescent detection and laser cooling. Our method could offer significant simplifications in future experiments that would otherwise be prohibitively complex.

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“…In order to solve the problems related to the decoherences and the precise control of the pulses, we look for the possibility of using optical pumping for enantioconversion in this paper. Optical pumping [65] is a widely used method for manipulating the inner states of quantum targets, ranging from the nuclear spin of atoms [66], quantum dot [67], hyperfine states of atoms [68] and molecules [69], to ro-vibrational (or rotational) states of molecules [70][71][72]. Excluding the details of different quantum targets, the key point of optical pumping is the state-selective excitation [65].…”

mentioning

confidence: 99%

Enantio-conversion of chiral mixtures via optical pumping

Ye,

Liu,

Chen

et al. 2020

Preprint

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Enantio-conversion with the help of electromagnetic fields is an essential issue due to the chiralitydependence of many chemical, biological, and pharmaceutical processes. Here, we propose a method for this issue based on a five-level double-∆ model of chiral molecules. By utilizing the breaking of left-right symmetry in the two ∆-type sub-structures, we can establish the chiral-state-selective excitation with one chiral ground state being excited to an achiral excited state and the other one being undisturbed. In the meanwhile, the achiral excited state will relax to the two chiral ground states. The two effects simultaneously acting on the chiral mixtures can convert molecules of different chiralities to the ones of the same chirality, i.e., the enantio-conversion via optical pumping. With typical parameters in gas-phase experiments, we numerically show that highly efficient enantioconversion can be achieved. Our method works in the appearance of decoherences and without the precise control of pulse-durations (pulse-areas) and/or pulse-shapes. These advantages offer it promising features in promoting the future exploring of enantio-conversion. I. INTRODUCTIONRecently, the inner-state enantio-purification [1-19], spatial enantio-separation [20-30], and enantiodiscrimination [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] have become essential issues, since the vast majority of chemical [50], biological [51][52][53], and pharmaceutical [54-57] processes essentially depend on molecular chirality. For these purposes, the (electronic, vibrational, and/or rotational) inner states of chiral molecules are manipulated with the help of electromagnetic fields. Moreover, precisely manipulating the rotational populations of chiral molecules has opened new avenues to study parity violation [58,59].The inner-state enantio-purification includes the enantio-specific state transfer [1-12] and the enantioconversion [13][14][15][16][17][18][19]. It aims to enhance the population excess of one chirality over the other in an inner state in chiral mixtures. The achieved inner-state enantiomeric excess characterizes the efficiency of the inner-state enantiopurification. The enantio-specific state transfer [1][2][3][4][5][6][7][8][9][10][11][12] achieves the enhancement of inner-state enantiomeric excess without changing the chiralities of molecules. The enantio-conversion [13][14][15][16][17][18][19] is more ambitious, since it aims to convert molecules of different chiralities to the ones of the same chirality.Most proposals of the inner-state enantiopurification [1-19] are based on few-level models with left-right symmetry-breaking ∆-type (sub-) structures (e.g. the three-level ∆ type model [1][2][3][4][5][6][7][8][9][10][11][12][13] and the four-level double-∆ [14-19] model). In these models, the chirality-dependency results from the sign difference between the products of the three electric-dipole transition

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Direct Laser Cooling of a Symmetric Top Molecule

Cited by 6 publications

References 56 publications

Polyatomic Molecules as Quantum Sensors for Fundamental Physics

Polyatomic Molecules as Quantum Sensors for Fundamental Physics

Synthesizing Optical Spectra using Computer-Generated Holography Techniques

Enantio-conversion of chiral mixtures via optical pumping

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