Summary
- IBM has reported achieving "trusted quantum advantage" through the use of 70 logical qubits and a novel error-correction approach.
- This experimental computation surpassed the capabilities of contemporary classical simulation techniques and provided statistical proof of its accuracy.
- While this represents a significant step in IBM's quantum endeavors, the current hardware is still far from being able to pose a genuine threat to Bitcoin's security.
IBM has announced its achievement of what it terms "trusted quantum advantage," asserting that a quantum computer has completed a computation that exceeds the reach of leading classical simulation methods, while also providing statistical validation of the result's accuracy.
This research, conducted in collaboration with the University of Chicago, represents a significant advancement in IBM's quest to develop fault-tolerant quantum computers. Although this breakthrough does not significantly alter the immediate security landscape for Bitcoin, it contributes to ongoing research focused on overcoming one of the major challenges in quantum computing: effectively correcting errors while scaling systems.
Quantum advantage refers to instances where a quantum computer can solve a practical problem more rapidly, cost-effectively, or efficiently than the best classical computers available.
“We are now firmly in the quantum advantage era,” stated Jay Gambetta, Director of IBM Research and IBM Fellow. “This milestone provides scientists, developers, and businesses with a new foundation for trusting quantum computers as they tackle problems far beyond classical capabilities.”
In its recent announcement, IBM indicated that researchers successfully encoded 70 logical qubits with a new error-correction technique, completing a computation in approximately 15 minutes that would take impractically long on current classical simulation methods. The experiment carried out 2,415 logical two-qubit operations and 468 logical T gates, while reducing logical error rates to about one-tenth of the physical error rate.
Additionally, this experiment addresses a long-standing concern regarding the verification of quantum advantage demonstrations. Rather than relying on traditional random circuit sampling, the researchers employed a structured method that enables error detection during computation while maintaining the mathematical complexity of the problem.
“Verification remains one of the biggest challenges in firmly establishing experimental quantum advantage,” noted Bill Fefferman, Associate Professor at the University of Chicago. “This experiment develops techniques to better characterize the fidelity of hard quantum states under noise, increasing confidence that the quantum computer is solving a computationally hard problem.”
This announcement follows several key milestones outlined in IBM's Starling roadmap, which aims for a large-scale fault-tolerant quantum computer by 2029. The roadmap includes verified demonstrations of quantum advantage prior to scaling to modular processors and ultimately achieving a system capable of around 200 logical qubits and 100 million quantum operations.
Throughout the past year, IBM has made steady progress toward these objectives.
In October 2025, researchers showcased a 120-qubit GHZ "cat state," followed by the introduction of its 120-qubit Nighthawk processor and experimental Loon chip in the following month, both aimed at enhancing fault-tolerant computing. Earlier this year, the company broadened public access to more advanced quantum hardware, granting researchers additional time to refine algorithms and error-correction methods.
For Bitcoin, this latest experiment should be seen as a gradual technical progression towards ‘Q-Day’ rather than a shift in the current threat landscape. Bitcoin's security relies on elliptic curve cryptography for digital signatures, and experts generally believe that compromising the network's encryption would necessitate thousands of logical qubits functioning on a fault-tolerant quantum computer—far exceeding the 70 logical qubits demonstrated in IBM's recent study.