Determination of CaOH and CaOCH<sub>3</sub> vibrational branching ratios for direct laser cooling and trapping

Kozyryev, Ivan; Steimle, Timothy C.; Yu, Phelan; Nguyen, Duc Trung; Doyle, John M.

doi:10.1088/1367-2630/ab19d7

Cited by 58 publications

(74 citation statements)

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“…Recently, a vibrationally closed photon cycling scheme for the symmetric-top molecule CaOCH 3 was identified [39], where fewer than 5 cycling and repump lasers in total (an experimentally manageable task) were needed to scatter ∼10 5 photons (figure 2). This number is sufficient for creating a magneto-optical trap (MOT), which can subsequently be loaded into a closely spaced (∼0.5 μm) 1D optical lattice (figure 1) using sub-Doppler cooling [28,40,41].…”

Section: Producing and Detecting Arrays Of Optically Trapped Stmsmentioning

confidence: 99%

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A scalable quantum computing platform using symmetric-top molecules

et al. 2019

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We propose a new scalable platform for quantum computing (QC)-an array of optically trapped symmetric-top molecules (STMs) of the alkaline earth monomethoxide (MOCH 3 ) family. Individual STMs form qubits, and the system is readily scalable to 100-1000 qubits. STM qubits have desirable features for QC compared to atoms and diatomic molecules. The additional rotational degree of freedom about the symmetric-top axis gives rise to closely spaced opposite parity K-doublets that allow full alignment at low electric fields, and the hyperfine structure naturally provides magnetically insensitive states with switchable electric dipole moments. These features lead to much reduced requirements for electric field control, provide minimal sensitivity to environmental perturbations, and allow for 2-qubit interactions that can be switched on at will. We examine in detail the internal structure of STMs relevant to our proposed platform, taking into account the full effective molecular Hamiltonian including hyperfine interactions, and identify useable STM qubit states. We then examine the effects of the electric dipolar interaction in STMs, which not only guide the design of high-fidelity gates, but also elucidate the nature of dipolar exchange in STMs. Under realistic experimental parameters, we estimate that the proposed QC platform could yield gate errors at the 10 −3 level, approaching that required for fault-tolerant QC.

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Section: Producing and Detecting Arrays Of Optically Trapped Stmsmentioning

confidence: 99%

“…3 . Shown are the wavelengths of the transitions, and the vibrational branching ratios [39]. The vibrational numbers are labeled in analogy to linear triatomic molecules (i.e.…”

Section: Producing and Detecting Arrays Of Optically Trapped Stmsmentioning

confidence: 99%

A scalable quantum computing platform using symmetric-top molecules

et al. 2019

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“…Finally, Ref. [21] proposed that replacing the hydrogen atom in the monohydroxide with larger ligand should not significantly disturb the valence electron of metal-cation so that optical cycling and cooling even larger polyatomic molecule might remain possible. Detailed confirmation of this idea also awaits future research.…”

Section: Discussionmentioning

confidence: 99%

“…To eliminate rotational branching during the photon cycling process experimentalists use of the rotationally closed J → J − 1 angular momentum transitions (see for details Refs. [20,21]). A significant effort from the scientific community, however, is needed to identify and study the classes of polyatomic molecules with closed optical cycling transitions.…”

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Emulating optical cycling centers in polyatomic molecules

Kłos

Petrov

et al. 2019

Commun Phys

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An optical cycling center (OCC) is a recently coined term to indicate two electronic states within a complex quantum object that can repeatedly experience optical laser excitation and spontaneous decay, while being well isolated from its environment. Here we present a quantitative understanding of electronic, vibrational, and rotational excitations of the polyatomic SrOH molecule, which possesses a localized OCC near its Sr atom. In particular, we describe the vibrationally-dependent trends in the Franck-Condon factors of the bending and stretching modes of the molecular electronic states coupled in the optical transition. These simulations required us to perform electronic structure calculations of the multi-dimensional potential energy surfaces of both ground and excited states, the determination of vibrational and bending modes, and corresponding Franck-Condon factors. We also discuss the extent to which the optical cycling center has diagonal Franck-Condon factors. * skotoch@temple.edu arXiv:1904.11579v2 [physics.chem-ph] 2 Dec 2019Laser cooling and trapping of atoms, enabled by the existence of closed optical cycling transitions, have revolutionized atomic physics and led to breakthroughs in several disciplines of science and technology [1]. These advances enabled the simulation of exotic phases in quantum-degenerate atomic gases, the creation of a novel generation of atomic clocks, matter-wave interferometry, and the development of other highly-sensitive sensors. Temperatures below tens of microkelvin have also allowed the confinement of diatomic molecules, built from or associated with laser-cooled atoms, in electric, magnetic, and/or optical traps, where they are isolated from their environment and can be carefully studied.Achieving similar temperatures for polyatomic molecules, however, remains challenging.Since polyatomic molecules are characterized by multiple degrees of freedom and have correspondingly more complex structures, it is far from obvious whether there exists polyatomic molecules that have the nearly-closed optical cycling transitions required for successful laser cooling. Such transitions could then repeatedly scatter photons.A diverse list of promising applications for ultracold polyatomic molecules exists. This includes creating novel types of sensors, advancing quantum information science, simulation of complex exotic materials, performing precision spectroscopy to test the Standard Model of particle physics, and, excitingly, the promise of control of quantum chemical reactions when each molecule is prepared in a unique rovibrational quantum state. Moreover, the de Broglie wavelength of colliding ultracold molecules is much larger than the range of intermolecular forces and, thus, the science of the breaking and making of chemical bonds has entered into an unexplored regime.Over the decades many spectroscopic studies of molecules consisting of an alkaline-earth metal atom (M) and a ligand have been performed [2-10], predominantly to determine their structure. The simplest polyatomic mol...

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“…The newest members on the list of laser-coolable species are polyatomic species [7][8][9][10]. The linear triatomic species SrOH is a good candidate for laser cooling [11], and has been deflected by optical forces [12], opening the way for similar species such as CaOH and CaOCH 3 [13], and more besides. These species should expand opportunities for quantum information, sensing, and fundamental physics [9].…”

Section: Introductionmentioning

confidence: 99%

Ultracold collisions of polyatomic molecules: CaOH

Augustovičová

Bohn

2019

New J. Phys.

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Ultracold collisions of the polyatomic species CaOH are considered, in internal states where the collisions should be dominated by long-range dipole-dipole interactions. The computed rate constants suggest that evaporative cooling can be quite efficient for these species, provided they start at temperatures achievable by laser cooling. The rate constants are shown to become more favorable for evaporative cooling as the electric field increases. Moreover, long-range dimer states (CaOH) 2 * are predicated to occur, having lifetimes on the order of microseconds. which is exothermic by some 13 000 K. Ca(OH) 2 is a stable compound used in industrial applications like paper production and sewage treatment. It is not known whether the reaction (1) occurs at low temperatures in the gas phase. If it does, this is obviously a detriment to producing and maintaining a stable, ultracold gas of CaOH. We will disregard the possibility that the reaction occurs, both because the potential energy surface is unknown, and because, in the appropriate internal states, the molecules are expected to be shielded by the repulsive parts of the dipole-dipole interaction.This circumstance simplifies the description of scattering, and leads to certain common behaviors. In this article, exploiting the electric dipole moment of CaOH and considering a state that has a small parity doublet, we find that these behaviors still occur. The behaviors that we single out are: (1) a suppression of inelastic scattering at sufficiently high electric field and sufficiently low temperature, for states that can be optically trapped; and (2) a set of electric-field resonances, previously described as 'field linked states', [16,17] that could serve as an additional platform for controlling these species and their interaction.

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Determination of CaOH and CaOCH₃ vibrational branching ratios for direct laser cooling and trapping

Cited by 58 publications

References 88 publications

A scalable quantum computing platform using symmetric-top molecules

A scalable quantum computing platform using symmetric-top molecules

Emulating optical cycling centers in polyatomic molecules

Ultracold collisions of polyatomic molecules: CaOH

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Determination of CaOH and CaOCH3 vibrational branching ratios for direct laser cooling and trapping

Cited by 58 publications

References 88 publications

A scalable quantum computing platform using symmetric-top molecules

A scalable quantum computing platform using symmetric-top molecules

Emulating optical cycling centers in polyatomic molecules

Ultracold collisions of polyatomic molecules: CaOH

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Determination of CaOH and CaOCH₃ vibrational branching ratios for direct laser cooling and trapping