Researchers at the Korea Institute of Science and Technology (KIST) have advanced quantum computing by using qudits—higher-dimensional quantum units—over traditional qubits to perform accurate calculations in quantum chemistry without error-correction techniques. Their Variational Quantum Eigensolver (VQE), a hybrid algorithm combining quantum and classical computing, enabled high-dimensional computations using single-photon orbital angular momentum states. This approach reduced errors and computational resource demands, achieving chemical accuracy in estimating molecular bond lengths for hydrogen and lithium hydride systems. The study, published in Science Advances, highlights the potential of qudit-based quantum computing for applications in drug development, battery technology, and climate modeling, demonstrating scalability and efficiency in tackling complex problems.
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