IBM and University of Chicago Demonstrate Quantum Advantage with ‘Trusted Quantum Computation on Logical Circuits,’ Solving Problems with 70 Logical Qubits in 15 Minutes

August 2, 2026

IBM Newsroom USA

Overview

IBM and University of Chicago researchers successfully demonstrated quantum advantage, performing calculations intractable for classical simulation methods while ensuring the accuracy of their results. They encoded 70 logical qubits using novel error correction techniques, solving a classically intractable problem in approximately 15 minutes. This marks one of the largest demonstrations of logical quantum computing to date, representing a critical step towards scaling quantum computers and achieving practical fault-tolerant quantum computing.

In Depth

Key Findings

IBM and the University of Chicago research team have announced a breakthrough in quantum computing, successfully demonstrating ‘quantum advantage’ by performing computations that are virtually impossible for modern classical computers to simulate. Crucially, they also established the accuracy and trustworthiness of these computational results with high reliability. Using novel error correction methods, the team effectively encoded 70 logical qubits and solved a specific, classically intractable computational problem in approximately 15 minutes. This achievement represents one of the largest demonstrations of logical quantum computing reported to date, marking a profoundly significant advancement towards the realization of practical fault-tolerant quantum computers (FTQC).

Technical and Experimental Details

Logical Qubits and Error Correction: The researchers applied advanced error correction techniques to form stable ‘logical qubits’ from multiple physical qubits. This approach significantly mitigates the impact of inherent noise and errors in physical qubits, enabling longer and more accurate computations. In this demonstration, 70 logical qubits were encoded, and their stability was rigorously validated.
Solving Classically Intractable Problems: The research targeted a type of computational problem that requires exponentially increasing classical computational resources for precise simulation. By executing these calculations on an IBM quantum processor, the problem was solved in just about 15 minutes, clearly demonstrating the quantum computer’s ability to outperform classical machines for specific tasks.
Trustworthiness and Verification of Results: A key criticism leveled against previous claims of quantum advantage has been the difficulty of verifying results using classical methods. IBM and the University of Chicago developed new verification protocols to ensure the reliability of their quantum computations. This directly addresses the challenge of ‘trusted quantum computation,’ which is recognized as one of the biggest hurdles to practical quantum computing.

This achievement underscores the importance of not only increasing qubit count but also enhancing qubit quality and reliability, highlighting the central role of quantum error correction in advancing quantum computing.

Background and Context

The concept of quantum advantage (or quantum supremacy) refers to a quantum computer’s ability to solve a particular computational task significantly faster, or to solve problems previously deemed intractable, compared to any existing classical computer. Google’s 2019 demonstration with its ‘Sycamore’ processor was widely recognized as the first practical demonstration of quantum advantage, though its verifiability and practical utility remained a subject of debate. IBM’s recent breakthrough extends beyond mere speed advantage, emphasizing the novel aspect of ‘trusted quantum computation,’ thereby deepening the understanding of quantum advantage and further paving the way for practical quantum computing. This is a critical step in quantum computing’s evolution from a theoretical curiosity to a real-world problem-solving tool.

Strategic Significance and Outlook

This groundbreaking demonstration by IBM and the University of Chicago establishes a significant milestone toward realizing fault-tolerant quantum computing. With continued improvements in the number and reliability of logical qubits, it becomes increasingly plausible that quantum computers will tackle complex problems in fields such as pharmaceuticals, materials science, financial modeling, and artificial intelligence. The results unequivocally indicate that quantum computing is moving beyond the confines of research laboratories and into industrial applications, further accelerating investment and R&D in quantum technologies. The coming years are expected to see intensified competition in developing larger, more reliable quantum computers, propelling the entire quantum ecosystem into a new phase of development.

Source: https://newsroom.ibm.com/2026-07-30-ibm-and-the-university-of-chicago-demonstrate-quantum-advantage,-establishing-trusted-quantum-computation-on-logical-circuits

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