9/4/2023 0 Comments Neutral atomOnce they prepared their qubits in the -½ magnetic substate of Yb-171, members of both teams were able to demonstrate single-qubit operations, initializing the qubits to the ½ state with a fidelity (a measure of the operation’s control) of 99.95%. This sequence loaded a single atom in more than 90% of the array, and according to Aruku Senoo, a PhD student working on the JILA experiment, combining it with the well-developed tweezer rearrangement protocol should make it possible to scale qubit numbers. This allows the researchers to use an additional laser beam to “kick out” excess atoms from overloaded tweezer sites in order to isolate a single atom at each site. The trapped atoms are then placed in a magnetic field, which divides them into separated groups determined by their magnetic substates. The increase in density ensures that each of the 100 tweezer sites contains at least one atom. The gas is then compressed to increase the atom density before the atoms are loaded into an optical potential formed by a 10 × 10 array of devices known as optical tweezers. In a technique the JILA team call “near-deterministic loading”, a gas of atoms is first cooled and prepared in a magneto-optical trap. Setting up an optical tweezer arrayĪn important criterion for a high-fidelity quantum computer is to have as much control as possible over the way the quantum register is set up. Yb-based qubits could therefore allow for more efficient gate operations, boosting the performance of quantum information processors. The rich internal structure of the “alkali earth-like” metal Yb offers numerous possibilities for cooling and trapping while also making it possible to create qubit systems that are robust to external perturbations. In the latest experiments, independent teams led by Adam Kaufmann from JILA in Colorado and Jeff Thompson from Princeton University in New Jersey instead used the nuclear spin of a Yb isotope, Yb-171, as their choice of qubit. Webinars Tune into online presentations that allow expert speakers to explain novel tools and applications.Video Watch our specially filmed videos to get a different slant on the latest science.Podcasts Our regular conversations with inspiring figures from the scientific community. Audio and video Explore the sights and sounds of the scientific world.Supercool physics Experiments that probe the exotic behaviour of matter at ultralow temperatures depend on the latest cryogenics technology.The science and business of space Explore the latest trends and opportunities associated with designing, building, launching and exploiting space-based technologies.Revolutions in computing Find out how scientists are exploiting digital technologies to understand online behaviour and drive research progress.Nanotechnology in action The challenges and opportunities of turning advances in nanotechnology into commercial products.#BlackInPhysics Celebrating Black physicists and revealing a more complete picture of what a physicist looks like.Artificial intelligence Explore the ways in which today’s world relies on AI, and ponder how this technology might shape the world of tomorrow.Collections Explore special collections that bring together our best content on trending topics.Innovation showcases A round-up of the latest innovation from our corporate partners.Projects and facilities Follow the latest progress at the world’s top scientific experiments.Policy and funding Understand how emerging policy changes could affect your work and career.Education and outreach Learn about novel approaches to educating and inspiring the scientists of the future. Business and innovation Find out how recent scientific breakthroughs are driving business innovation and commercial growth.
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