Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session U04: Focus Session: Molecular Ions and Ion-Atom InteractionsFocus Live
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Chair: Eric Cornell, Boulder |
Thursday, June 3, 2021 2:00PM - 2:30PM Live |
U04.00001: Watching Chemical Reactions Happen One Molecule at a Time Invited Speaker: Heather J Lewandowski Reactions between ions and radical molecules play an important role in the chemistry that drives dynamics in the interstellar medium and during combustion of hydrocarbons. Unfortunately, experimental measurements of these reactions are very challenging, and thus very rare. We use tools borrowed from the cold atom community to measure ion-molecule reactions in a well-controlled environment. Here, we can study reactions between atoms and molecules in single quantum states at low temperatures. Our high sensitivity allows us to study reactions where the reaction rate can be as low as one reaction per minute. I will present the capabilities of this cold ion-molecule reaction apparatus and some example reactions we have been able to study using this new system. |
Thursday, June 3, 2021 2:30PM - 2:42PM Live |
U04.00002: Progress towards dipole-phonon quantum logic with trapped CaO+ and Ca+ ion Lu Qi, Evan C Reed, Ziyi Wang, Swapnil Patel, Jyothi Saraladevi, Kenneth R Brown, Eric R Hudson, Wes Campbell, Michael C Heaven The rich internal structure of molecular ions provides challenges and opportunities for the control of molecular states for quantum information. Here we focus on dipole-phonon quantum logic, where the state of the molecular ion can be controlled through the coupling of the molecular ion dipole to its motion in an ion trap [1,2]. This requires the careful choice of a molecular ion with a dipole-allowed transition at typical ion trap frequencies. We have identified the L-doublet states of CaO+ as an ideal candidate with a predicted splitting of 0.45 MHz and 1.9 MHz for states |??2Π3/2,??=0,??=3/2〉 and |??2Π3/2,??=0,??=5/2〉 [3]. In our experiment, we trap a calcium oxide ion (CaO+) and a calcium ion (Ca+), where the Ca+ ion is used for sympathetic cooling and the readout of the phonon state. In this talk, we will report on the challenges of preparing CaO+ in the desired state and our latest progress towards observing dipole-phonon quantum logic. |
Thursday, June 3, 2021 2:42PM - 2:54PM Live |
U04.00003: Towards quantum control and spectroscopy of single, light molecular ions Nick Schwegler, David Holzapfel, Jonathan P Home, Daniel Kienzler I will present progress towards quantum control and spectroscopy of single, light molecular ions. We have constructed a cryogenic ultra-high vacuum apparatus housing a microfabricated, monolithic linear Paul trap. Our experimental approach aims to co-trap $^{9}$Be$^{+}$ atomic ions with single molecular ions that are ionized using electron bombardment. We aim to use buffer gas cooling in combination with quantum logic spectroscopy to prepare the internal state of the molecular ion in a pure quantum state, as well as to perform non-destructive state readout. \\ |
Thursday, June 3, 2021 2:54PM - 3:06PM Live |
U04.00004: Toward quantum-logic spectroscopy of single molecular ions in a cryogenic ion trap Dalton W Chaffee, Julian Schmidt, Dietrich Leibfried, David Leibrandt, Chin-wen Chou Quantum state control of trapped and cooled atomic ions is an established technique with applications including precision metrology and quantum information processing. Molecules provide even richer physics, but their additional degrees of freedom make such control more challenging. In our group, quantum-logic spectroscopy (QLS) of a single CaH+ ion has enabled preparation and coherent manipulation of pure molecular quantum states [1, 2, 3]. However, the currently used loading scheme is applicable only to certain compounds of the co-trapped atomic species, and background gas collisions and black-body radiation in the room-temperature apparatus eventually limit measurement precision and fidelity of quantum control. Here, we present progress of the design and construction of a cryogenic ion trap apparatus for more versatile loading of molecular ions and better control of their states. Molecules will be injected from an interchangeable gas source, ionized in a strong laser field, and co-trapped with an atomic ion for QLS. Currently, construction of a vacuum chamber to allow for preliminary trapping and ionization tests is underway. This device will ultimately be used to perform precision spectroscopy of molecules relevant for, e.g., tests of fundamental physics. |
Thursday, June 3, 2021 3:06PM - 3:36PM Live |
U04.00005: The quantum physics of interacting atoms and ions Invited Speaker: Rene Gerritsma
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Thursday, June 3, 2021 3:36PM - 3:48PM On Demand |
U04.00006: Co-trapping K, Ca+, and CaH+: Ion-atom-molecule interaction measurements Jyothi Saraladevi, Swapnil Patel, Eric Pretzsch, Evan C Reed, Lu Qi, Kenneth R Brown In this talk, we present our recent experimental results on co-trapping calcium monohydride ions (CaH+) with laser-cooled potassium atoms (K) and calcium ions (Ca+). Our goal is to attain good stability of the laser-cooled atoms and ions, a pre-requisite for sympathetic cooling of translational and internal state energies of CaH+. For this, we developed an ion-atom hybrid trap [1] by combining a magneto-optical trap for atoms with a lineal Paul trap for ions. We investigated the K- Ca+ [2] and K-CaH+ collisional interactions and these results will be discussed in this presentation. |
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