• Tue. Nov 28th, 2023

    Critical Thought

    Critical thoughts on quantum technologies

    Scientists Harness Quantum Mechanics to Observe Molecular Dance with Unprecedented Precision

    ByByron Bekker

    Nov 21, 2023
    Scientists Harness Quantum Mechanics to Observe Molecular Dance with Unprecedented Precision

    In a groundbreaking study, scientists have achieved an extraordinary feat – they have managed to witness a vital molecular dance that underlies fundamental chemical reactions, such as photosynthesis. Utilizing the power of quantum computers, researchers successfully slowed down a chemical reaction by an astounding 100 billion times. This remarkable accomplishment, detailed in a recent publication in the journal Nature Chemistry, centers around an intriguing molecular interaction called a conical intersection.

    Conical intersections are critical points in the molecular structure where the energy levels between two surfaces become equal. They function as gateways between different electronic states, facilitating rapid transitions that drive chemical reactions. Found in a multitude of reactions, including everyday phenomena like photosynthesis and the light-detection processes in the retina, conical intersections have long evaded direct observation due to their fleeting nature.

    To overcome this challenge, scientists at the University of Sydney employed a trapped-ion quantum computer, a revolutionary device that harnesses electrical fields to confine and manipulate quantum particles using lasers. This innovative approach allowed the researchers to extend the timescale of the chemical dynamics from femtoseconds (one quadrillionth of a second) to milliseconds. Consequently, this delay enabled them to capture precise measurements of the reaction unfolding in real-time, rather than relying on digital approximations.

    The study’s co-author, Vanessa Olaya Agudelo, a chemistry doctoral student, remarked, “In nature, the entire process happens within femtoseconds, an incredibly brief duration. By employing our quantum computer, we built a system capable of decelerating chemical dynamics to a speed at which we could observe and analyze them.” This quantum-induced slowdown presented a unique opportunity to gain insights into the intricacies of the reaction.

    Crucially, the observations made during this experiment were not mere simulations but direct analog observations of the quantum dynamics as they transpired. As study co-author Christophe Valahu, a physicist at the University of Sydney, noted, “Our experiment ventured beyond digital approximations, enabling us to witness the quantum dynamics unfolding before our eyes at an observable pace.” This groundbreaking technique offers a promising pathway to understanding ultrafast dynamics, holding immense potential for various applications in chemistry.

    The newfound comprehension of these ultrafast processes holds tremendous possibilities for advancing fields such as materials science, drug design, and solar energy harvesting, as highlighted by Olaya Agudelo. The ability to unravel the underlying mechanisms of molecules interacting with light may aid in improving processes entailing light-induced molecular interactions, including the formation of smog and the depletion of the ozone layer.

    Frequently Asked Questions (FAQ)

    1. What is a conical intersection?

      A conical intersection refers to a critical point in the structure of molecules where the energy between two surfaces is equal. It serves as a conduit for rapid transitions between different electronic states, facilitating various chemical reactions.

    2. How did scientists slow down the chemical reaction?

      Scientists employed a trapped-ion quantum computer, which utilizes electrical fields to confine and manipulate quantum particles with the help of lasers. This quantum computer enabled the researchers to extend the timescale of the chemical reaction, slowing it down significantly for in-depth analysis.

    3. What are the potential applications of understanding ultrafast chemical dynamics?

      Understanding ultrafast chemical dynamics can have far-reaching applications in diverse fields. It can contribute to advancements in materials science, drug design, solar energy harvesting, and help improve processes reliant on molecules interacting with light, such as the formation of smog or the degradation of the ozone layer.

    Source: nature.com/nchem