HIGH PERFORMANCE COMPUTING


“We knew crosstalk was an issue for our qutrit processor, but now we can quantify its impact on our qutrit device”


in nature by symmetry and structural perfection. A fundamental challenge in quantum information processing is to develop architectures that allow coherent signals to be exchanged in a resource- efficient manner without inducing classical behaviour. The quantum processor team focuses


on developing long-lives superconducting quantum bits that are custom designed for specific computing applications. The high-level goals of Quantum


Processor Development design revolve around generating multi-qubit devices with a modular architecture. Entanglement then has to be efficiently generated within the chip and passed onto classical circuitry. High performance computing plays a


Vertical alignment of the quantum processor unit


these results contribute to a growing field already exploring qutrits. ‘We think these new tools will push forward qutrit architecture and the usage of qutrits in quantum computing. It is really a major milestone to develop a robust qutrit quantum computer that will allow us to predict how well algorithms will perform on our qutrit processor, and we hope that, at some point, qutrits will catch up to qubits,’ said Morvan. Measuring how unwanted interactions


introduce crosstalk errors in the processor is an example of the direct application of RB techniques. Crosstalk errors occur when the desired action on one or more qubits unintentionally affects others.


The future of superconducting quantum computers The Advanced Quantum Testbed (AQT) is a collaborative research program to advance quantum computation based on superconducting circuits. The researchers implement quantum algorithms co-designed for current noisy


www.scientific-computing.com | @scwmagazine


intermediate-scale quantum hardware to solve computational problems relevant to the scientific mission of the Department of Energy (DOE). Application areas include optimisation, materials science and high- energy physics. In addition, AQT partners with members of the quantum information science community in extended user research projects. The AQT have commissioned an instrument to explore and define the future of superconducting quantum computers end-to-end. Today, the centre can design and fabricate proof of principle quantum processors with different information encoding, circuit topology and control architecture to explore problems of interest for DOE scientists. They seek the best ideas, hardware and algorithms, bringing together world-class science and solutions. The research group focuses its efforts


on three key areas: Quantum Computation and Simulation, Quantum Processor Development and Quantum Control. Quantum coherence is well preserved


critical role in scientific discovery, and researchers increasingly rely on advances in computer science, mathematics, computational science, data science and large-scale computing and networking to increase our understanding of ourselves, our planet and our universe. Berkeley Lab’s Computing Sciences Area researches, develops and deploys new foundations, tools and technologies to meet these needs and to advance research across a broad range of scientific disciplines. Founded in 1931 on the belief that the biggest scientific challenges are best addressed by teams, Lawrence Berkeley National Laboratory and its scientists have been recognised with 13 Nobel Prizes. Today, Berkeley Lab researchers develop sustainable energy and environmental solutions, create useful new materials, advance the frontiers of computing, and probe the mysteries of life, matter and the universe. Scientists from around the world rely on the lab’s facilities for their own discovery science. Berkeley Lab is a multiprogramme national laboratory, managed by the University of California for the U.S. Department of Energy’s Office of Science – the single largest supporter of basic research in the physical sciences in the United States. The Office of Science is working to address some of the most pressing challenges of our time.


For more information, visit energy.gov/science


Autumn 2021 Scientific Computing World 13


Berkeley Lab


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