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Real-time quantum error correction beyond break-even
V V Sivak1,2,3,4, A Eickbusch5,6,7, B Royer5,6,7,8,9
1Department of Physics, Yale University, New Haven, CT, USA. vladsivak@google.com.
Nature
|March 23, 2023
Summary
Researchers demonstrate a stabilized logical qubit that extends quantum coherence, overcoming decoherence challenges in quantum computing. This breakthrough significantly improves quantum error correction (QEC) capabilities.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Quantum Error Correction
Background:
- Quantum computation relies on maintaining quantum coherence, which is fundamentally challenged by decoherence.
- Quantum error correction (QEC) aims to counteract decoherence by using cooperative processes to remove errors faster than they accumulate.
- Previous QEC experiments struggled with excessive error generation, hindering practical application.
Purpose of the Study:
- To experimentally demonstrate a practical quantum error correction (QEC) method for extending quantum coherence.
- To determine if QEC can practically enable longer quantum coherence times than individual quantum components.
Main Methods:
- Development of a fully stabilized logical qubit system.
- Integration of superconducting quantum circuit fabrication innovations.
- Application of model-free reinforcement learning for process optimization.
Main Results:
- Demonstrated a logical qubit with substantially longer quantum coherence than its constituent components.
- Achieved a coherence gain of G = 2.27 ± 0.07, surpassing the performance of individual qubits.
- Successfully stabilized and error-corrected the logical qubit, overcoming previous experimental limitations.
Conclusions:
- It is practically possible to utilize QEC for extending quantum coherence.
- The demonstrated QEC approach significantly enhances the stability and coherence time of logical qubits.
- This work paves the way for more robust and scalable quantum computers.
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