Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G02: Quantum Tools for Chemistry and Chemistry for Quantum Tools IIInvited Live Streamed
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Sponsoring Units: DCP Chair: Wes Campbell, UCLA Room: McCormick Place W-175C |
Tuesday, March 15, 2022 11:30AM - 12:06PM |
G02.00001: Creating and controlling spin qubits through molecular engineering Invited Speaker: David D Awschalom Spin-based defects within semiconductors are used to construct quantum devices and machines that enable information processing and sensing technologies based on the quantum nature of electrons and atomic nuclei. These materials possess an electronic spin state that can be employed as a quantum bit over a range of temperatures. They have a built-in optical interface in the visible and telecom bands, retain their quantum properties over millisecond timescales or longer, and can be manipulated using a simple combination of light and microwaves. Alternatively, molecular spin systems are attractive building blocks for quantum information science. Through a chemical approach, bottom-up design of qubits enables atomistic tunability of their environment, scalability to multi-qubit architectures using directed assembly, and portability between various host materials and devices. With these functionalities-which are challenging to achieve with semiconductor defects-designer qubits could be synthesized for a diverse range of applications from quantum sensing in biosystems to the creation of nodes in a quantum network. To demonstrate that the enabling features of solid-state defects can be translated into a molecular architecture, we discuss transition metal-based molecular spins with optical addressability. These molecules comprise a central chromium ion coordinated to surrounding ligands, enabling optical initialization and read out, as well as coherent microwave manipulation of the ground-state spin. We also show atomistic tunability of qubit properties by comparing molecules which differ by the placement of a single methyl group on the coordinating ligands, resulting in marked changes in emission and ground state energies, highlighting how molecular qubits can be tailored for specific applications. Overall, this work indicates the potential of a chemical approach for quantum engineering with optically addressable spin systems. |
Tuesday, March 15, 2022 12:06PM - 12:42PM |
G02.00002: Developing Tools for Studying Cold and Controlled Chemical Reaction Dynamics Invited Speaker: Tiangang Yang Reactions at low temperatures are of significant importance in both fundamental chemistry and the interstellar medium. Quantum effects are more prevalent at cold temperatures, which significantly influence the chemistry and challenge the current model. To address these reactions experimentally, tools are required to lower the reaction temperature as well as control the translational and internal energies of reactants. Recently, we have set up a crossed molecular beam apparatus for studying cold reactions and found quantum-tunneling enhanced reactivity in the reaction of fluorine with para-hydrogen at temperatures down to 10K. In addition, we have developed a new platform for cold ion-molecule chemistry by combining tools from physics, which are cryogenic buffer gas cooling, laser-cooled ion sympathetic cooling, and integrated Time-of-Flight (TOF) mass spectrometer in an RF Paul trap. In this talk, I will discuss our most recent results on cold beryllium/carbon ions’ chemistry and the F+H2 reaction at low temperatures. |
Tuesday, March 15, 2022 12:42PM - 1:18PM |
G02.00003: A Synthetic, Rare-Earth-Metal Chemist's Encounter with Quantum Information Science Invited Speaker: William Evans This talk will explain how a synthetic chemist studying the inorganic and organometallic chemistry of the rare-earth metals (Sc, Y, and the lanthanides) got involved with single-molecule magnets and qubits before he even knew much about them. The presentation will illustrate how synthetic chemists may be making molecules useful in the advancement of quantum information science without realizing the potential of the new compounds. A description of the synthetic chemistry that led to single-molecule magnets like (C5Me5)Er(C8H8) and [K(18-crown-6)(THF)2]{[(R2N)2(THF)Ln]2(μ-η2:η2-N2)} (Ln = Dy, Tb; R = SiMe3) and qubits like [(C5H4SiMe3)3Y]1- and [Lu(OAr*)3]1- (OAr* = OC6H2Ad2-2,6-tBu-4; Ad = adamantyl) will be presented. |
Tuesday, March 15, 2022 1:18PM - 1:54PM |
G02.00004: Beyond one and zero: multiple-internal-state read-out for enhanced signal and suppression of systematic errors in experiments with molecules Invited Speaker: Eric A Cornell A waggish but short-sighted physicist once scorned diatomic molecules as having "one atom too many". Yet the benefits that molecules can offer to the fields of quantum information (QI) and particle physics (HEP) have become increasingly compelling. Long-range interactions between molecules are key features of novel QI schemes, and the large internal fields, and closely spaced states of opposite parity, can greatly enhance the signature of novel particle physics in eV-scale spectra. The large number of internal molecular quantum states can be seen as a liability, for instance making laser cooling more difficult. Yet if the populations of multiple internal states can each be determined distinctly, especially in a single experimental shot, one can begin to understand the diversity of states as a distinct asset. The variety of methods known to physical chemists as "action spectroscopy" offers opportunities for enhancing signal-to-noise and suppressing systematic errors. We present examples in the context of JILA's project to measure the electron's electric dipole moment using trapped molecular ions. |
Tuesday, March 15, 2022 1:54PM - 2:30PM |
G02.00005: Is there exponential quantum advantage in quantum chemistry? Invited Speaker: Garnet Chan I will discuss the evidence for and against the possibility of exponential quantum advantage in quantum chemistry. |
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