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Published on: September 25, 2020
Demonstration of high-fidelity entangled logical qubits using transmons
Arian Vezvaee1,2,3, Vinay Tripathi4,5,6, Mario Morford-Oberst7,4
1Department of Electrical & Computer Engineering, University of Southern California, Los Angeles, CA, USA. vezvaee@usc.edu.
We introduce normalizer dynamical decoupling (NDD), a hybrid quantum error correction (QEC) and dynamical decoupling (DD) strategy. This method significantly suppresses logical errors in quantum computers, enabling high-fidelity entangled logical qubits.
Area of Science:
- Quantum Computing
- Quantum Information Science
- Error Correction
Background:
- Quantum error correction (QEC) is essential for fault-tolerant quantum computation.
- Existing QEC codes have limitations in detecting logical errors.
- Dynamical decoupling (DD) is a technique to mitigate errors in quantum systems.
Purpose of the Study:
- To propose and implement a novel method to suppress logical errors in quantum computers.
- To enhance the performance of quantum error correction codes by integrating dynamical decoupling.
- To achieve high-fidelity entangled logical qubits beyond breakeven fidelities.
Main Methods:
- Leveraging normalizer elements of QEC codes as DD pulses, termed normalizer dynamical decoupling (NDD).
- Developing a hybrid QEC-NDD strategy capable of handling arbitrary weight errors.
- Implementing an error-detecting version of the strategy on IBM transmon devices using the [[4, 2, 2]] code.
Main Results:
- The hybrid QEC-NDD strategy significantly outperforms standalone QEC or DD.
- A method for detecting logical errors, primarily due to crosstalk, affecting encoded Bell states was demonstrated.
- Experimentally achieved high-fidelity entangled logical qubits with fidelities exceeding unprotected qubits.
Conclusions:
- The proposed NDD strategy offers a powerful approach to drastically suppress logical errors in quantum computers.
- This hybrid method enables the creation of high-fidelity entangled logical qubits, a crucial step towards fault-tolerant quantum computation.
- The experimental results validate the effectiveness of NDD in improving quantum computational performance.
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