Oxford University researchers have achieved a significant milestone in quantum computing by successfully teleporting a controlled quantum gate between two separate modules. This breakthrough, published in Nature, marks the first demonstration of distributed quantum computing using deterministic gate teleportation.
Oxford University researchers have made a significant stride towards large-scale distributed quantum computing by successfully demonstrating the first quantum teleportation of a controlled quantum gate between two separate modules. This breakthrough, published in Nature , represents a pivotal advancement in the field of quantum computing.
While quantum teleportation has been previously achieved, transferring quantum states between physically separated systems, the Oxford team's achievement focuses on teleporting a fundamental two-qubit quantum gate over two meters of optical fiber, connecting two distinct quantum modules. This deterministic teleportation of quantum gates, even across lossy photonic links, is crucial for large-scale quantum computations. Probabilistic interactions between qubits in large computations would exponentially decrease the likelihood of successful completion without any errors. The team achieved 86% fidelity in deterministically teleporting a Controlled-Z (CZ) gate between two circuit qubits in separate modules, marking the first implementation of a distributed quantum algorithm encompassing several non-local, two-qubit gates. This accomplishment paves the way for effectively 'wiring together' distinct quantum processors into a unified, fully-connected quantum computer. While a fully-fledged, industry-disrupting quantum computer would necessitate processing millions of qubits, making it prohibitively large and complex, the Oxford team's approach demonstrates how distributing quantum operations across smaller, interconnected devices, each handling only a few qubits, could provide a scalable pathway for building large-scale quantum systems.Beyond quantum gate teleportation, the team also demonstrated Grover's algorithm, a quantum search algorithm designed to accelerate searches through unstructured data, utilizing fewer queries during their experiment. They showcased its effectiveness in a two-qubit scenario, highlighting its ability to find a specific item within four possibilities with a single query, compared to an average of two queries classically. Although the team acknowledges that longer distances between quantum modules can lead to signal loss, they propose quantum repeaters as a potential solution to mitigate this issue. The team's work is considered a proof of concept, demonstrating that a distributed quantum computing approach is feasible. While the current fidelity of 86% at two meters is not yet sufficient for practical, large-scale quantum computers, the researchers anticipate rapid progress driven by increasing commercial investment in quantum technologies. They believe that this breakthrough could lead to advancements in distributed quantum computing, a quantum internet, enhanced cryptography, and further breakthroughs in physics and other fields
QUANTUM COMPUTING QUANTUM TELEPORTATION DISTRIBUTED QUANTUM COMPUTING OXFORD UNIVERSITY NATURE
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