... quantum error correction (QEC) techniques are going to be necessary to obtain the full benefits that quantum computing offers theoretically.
by LS Beevi · 2024 · Cited by 6 — We explore the field of quantum computing and specifically address the crucial problem of error reduction in the context of IBM simulators.
# What Is Quantum Error Correction: The Key to Quantum Computing. ## What Is Quantum Error Correction? Entangling these qubits helps detect and correct quantum errors without having to directly measure the qubits’ states. ## Types of Quantum Error Correction. Advanced quantum error-correcting codes, such as the Shor code, are designed to correct bit-phase flip errors by encoding the logical qubit in a way that protects it from all common types of quantum errors. QEC allows quantum systems to pinpoint and correct errors without directly measuring qubit states. Building hardware and software systems that can carry out error correction accurately without adding noise is a key challenge for reliable quantum computing. On top of that, making sure that error correction works hand-in-hand with quantum computations requires advancements in both hardware and algorithm development. ### What is quantum error correction? Quantum entanglement error correction uses the entangled state of qubits to detect and fix errors in a quantum system without collapsing their quantum state.
Quantum, Computing, Error Correction, Error Threshold, Decoding. For large-scale fault-tolerant quantum computers, we need to reduce the qubit overhead, increase the code distance, build reliable quantum gates, develop below error threshold correction codes, and expedite current decoding algorithms so they are real-time. Quantum error correction(QEC) encodes a _logical qubit_ within a subspace of multiple _physical qubits_ such that errors can be detected through stabilizer measurements without disturbing the logical state. Building a practical, large-scale quantum computer requires encoding logical information redundantly into many physical qubits to correct inevitable errors. When tested on real-world experimental data from Google’s Sycamore quantum processor, Alpha Qubit achieved a lower Logical Error Rate than any previously reported decoder, including the highly accurate tensor-network decoder, for both distance-3 and distance-5 surface codes. Exact Decoding of Quantum Error-Correcting Codes 18**. Exact decoding of quantum error-correcting codes.
With quantum error correction (QEC), quantum computers can achieve utility-scale and unlock breakthroughs well beyond the reach of the world’s largest classical computers. Why do quantum computers need QEC? #### Why do quantum computers need QEC? Why cracking quantum error correction is the key that will unlock quantum computing. #### Why cracking quantum error correction is the key that will unlock quantum computing. The Quantum Error Correction Report 2024. Contains a clear, non-technical introduction to quantum error correction, a comparison of QEC codes and future predictions. Read more The Quantum Error Correction Report 2025. Quantum error correction (QEC) is no longer a distant goal. Without Quantum Error Correction (QEC), quantum computers will never outperform classical systems. Quantum Error Correction (QEC) is now universally recognised as essential for achieving utility-scale quantum computers that can outperform classical systems on meaningful problems, according to the Quantum Error Correction Report 2025. ## Watch: The Quantum Error Correction Report 2024 Webinar.
For quantum codes, however, any measurements of the qubits performed as part of the error correction procedure must be carefully chosen so as not to cause the wavefunction to collapse and erase the encoded information. The three-qubit code is designed such that if an X-error occurs, the logical state is rotated to an orthogonal error space, an event that can be detected via a sequence of two stabilizer measurements. Example: The [[4,2,2]] detection code The [[4, 2, 2]] detection code is the smallest stabilizer code to offer protection against a quantum noise model in which the qubits are susceptible to both X- and Z-errors [39,40]. The logical qubit |ψ⟩L of an [[n, k, d]] stabilizer code is subject to an error process E. For a quantum circuit with noisy ancilla measurements, it is not always possible to decode the error correction code in a single round of syndrome extraction. Stabilizer codes and quantum error correction.
[Skip to content](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#content). [Subscribe](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#link-popup). [Subscribe](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#link-popup). * [Why Do Quantum Computers Need Error Correction?](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#Why_Do_Quantum_Computers_Need_Error_Correction). * [When Will Error-Corrected Quantum Computers Become Practical?](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#When_Will_Error-Corrected_Quantum_Computers_Become_Practical). * [Frequently Asked Questions](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#Frequently_Asked_Questions). * [Why Do Quantum Computers Need Error Correction?](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#Why_Do_Quantum_Computers_Need_Error_Correction). * [When Will Error-Corrected Quantum Computers Become Practical?](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#When_Will_Error-Corrected_Quantum_Computers_Become_Practical). * [Frequently Asked Questions](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#Frequently_Asked_Questions). This is why recent [demonstrations from Google, IBM, and others](https://thequantuminsider.com/2025/06/10/ibm-offers-roadmap-toward-large-scale-fault-tolerant-quantum-computer-at-new-ibm-quantum-data-center/) focus not just on qubit counts but on achieving error correction milestones: showing that logical error rates decrease as more physical qubits are added, demonstrating fault-tolerant operations on logical qubits, and scaling to multiple logical qubits working together. **Google Quantum AI** made headlines in December 2024 with the [announcement of its Willow chip](https://thequantuminsider.com/2025/12/12/google-opens-its-advanced-willow-chip-to-uk-researchers-in-search-for-practical-uses/), demonstrating that adding more physical qubits reduced logical error rates – a critical milestone called “below-threshold error correction.” The company continues to push surface code implementations and is building systems targeting millions of physical qubits. [×](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#). * [When Will Error-Corrected Quantum Computers Become Practical?](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#When_Will_Error-Corrected_Quantum_Computers_Become_Practical). * [Frequently Asked Questions](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#Frequently_Asked_Questions). [→Index](https://thequantuminsider.com/2026/03/16/understanding-quantum-error-correction-physical-logical-qubits/#).
A team led by Associate Professor Kenta Kasai at Institute of Science Tokyo (Science Tokyo) has discovered a [new quantum error-correction method](https://phys.org/news/2025-09-quantum-error-codes-enable-efficient.html) that comes extremely close to the theoretical limit—the hashing bound. With the [new method](https://phys.org/news/2023-10-illuminating-errors-paradigm-quantum.html?utm_source=embeddings&utm_medium=related&utm_campaign=internal), however, the time needed for error-correction computation barely increases even as the number of components grows. **Citation**: Error-correction technology to turn quantum computing into real-world power (2026, January 6) retrieved 8 April 2026 from https://phys.org/news/2026-01-error-technology-quantum-real-world.html. [Using microwave pulses to plug leaks in quantum computers makes them more reliable](https://phys.org/news/2025-12-microwave-pulses-leaks-quantum-reliable.html). 21 minutes ago](https://phys.org/news/2026-04-ai-uncovers-hidden-immune-defenses.html) [. 40 minutes ago](https://phys.org/news/2026-04-tooth-pendant-reveals-ancient-human.html) [. 1 hour ago](https://phys.org/news/2026-04-oldest-million-year-mummy-reveals.html) [. 1 hour ago](https://phys.org/news/2026-04-hair-bundles-ears-tiny-thermodynamic.html) [. 1 hour ago](https://phys.org/news/2026-04-neanderthals-central-europe-pond-turtles.html) [. 2 hours ago](https://phys.org/news/2026-04-pinprick-artemis-crew-witnesses-meteorite.html) [. 2 hours ago](https://phys.org/news/2026-04-shift-biology-aging.html) [. 2 hours ago](https://phys.org/news/2026-04-giant-jars-ancient-bells-bones.html) [. 7 hours ago](https://phys.org/news/2026-04-doesnt-recycle-plastic-lack-access.html) [. Dec 29, 2025](https://phys.org/news/2025-12-microwave-pulses-leaks-quantum-reliable.html) [. Sep 29, 2025](https://phys.org/news/2025-09-quantum-error-codes-enable-efficient.html) [. Dec 10, 2025](https://phys.org/news/2025-12-quantum-machine-nears-partial-error.html). Feb 26, 2025](https://phys.org/news/2025-02-schrdinger-cat-quantum.html) [. Dec 19, 2025](https://phys.org/news/2025-12-quantum-memory-problems.html) [. Dec 9, 2024](https://phys.org/news/2024-12-google-quantum-chip-error.html). Apr 7, 2026](https://phys.org/news/2026-04-quantum.html) [. Apr 6, 2026](https://phys.org/news/2026-04-mechanical-boost-diamond-quantum-sensor.html) [. Apr 6, 2026](https://phys.org/news/2026-04-quantum-ground-state-rotation-dimensions.html) [. Apr 4, 2026](https://phys.org/news/2026-03-microscopic-mechanism-quantum-collapse-real.html) [.