Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Enhanced Entanglement Protection of Logical Qubits by a Hybrid Quantum Error Correction and Entanglement Purification Scheme

Gaurav Bonde, Amarendra K. Sarma

Published Jun 5, 2026• 0 citations
Publisher

Abstract

Abstract Quantum entanglement is a fundamental resource for quantum computing, quantum communication, and quantum cryptography. In realistic quantum channels, however, entanglement is highly susceptible to noise and decoherence. Entanglement purification(EP) and quantum error correction (QEC) offer distinct approaches to protecting entanglement against noisy quantum channels. In this work, we propose a hybrid scheme that integrates these two approaches to enhance the protection of entanglement between logical qubits. The scheme exploits both the error-correcting capability of encoded logical qubits and the distillation power of entanglement purification, assuming recovery to the logical codespace after each QEC cycle. This combined approach enables improved entanglement preservation under noisy conditions. The resulting robust logical entanglement is well-suited for applications in quantum communication and quantum cryptography and offers a promising route toward more reliable distributed quantum information processing.

DOI
10.21203/rs.3.rs-9355732/v1

Related papers

Hybrid Error-Management Strategies in Quantum Repeater Networks

Poramet Pathumsoot, Theerapat Tansuwannont, Naphan Benchasattabuse +5 more

A quantum network is expected to enhance distributed quantum computing and quantum communication over a long distance while providing unconditional security. As quantum entanglement is essential for a quantum network, major issues from various types of noise and decoherence prevent it from being realized, and research has been intensively active to obtain optimal configurations for a quantum network. In this work, we address the performance of a quantum network capable of quantum error correction and entanglement purification. Our results show that one should distribute Bell pairs as fast as possible while balancing the deployment of fidelity enhancement. We also show suitable hybrid strategies in quantum cryptography tasks under some noise regimes that need to use purification and quantum error correction together. Our results suggest that using purification to distribute high fidelity Bell pairs and preserving them for application using quantum error correction is a promising way to achieve a near-term quantum network for secure communication.

arXiv:2303.10295•Mar 18, 2023•0 citations

Measurement-based logical qubit entanglement purification

Peishun Yan, Lan Zhou, Wei Zhong +1 more

Entanglement purification is the distilling of high-quality entanglement from low-quality entanglement and is a key element in the quantum repeater. As a new branch of entanglement purification, the measurement-based entanglement purification protocol (MBEPP) only requires one to perform the Bell state measurement to couple resource states with noisy pairs, and it tolerates more local noise than the conventional purification protocols. Existing MBEPPs usually focus on physical qubit entanglement. In this paper, we propose a measurement-based logical qubit entanglement purification protocol (MBLEPP) with quantum nondemolition detection (QND), where the qubit is encoded in the quantum parity code. The results show that this MBLEPP can also work with photon loss under the conditions that each block of the logical Bell state measurement contains at least one physical qubit, that at least one of the blocks is intact, and that the entanglement exists between all blocks. Moreover, we also consider the MBLEPP with imperfect QND. We show that below a certain QND error threshold, this MBLEPP can still work. In this way, this MBLEPP not only obtains high-fidelity entanglement but also tolerates photon loss and the error from imperfect QND. This MBLEPP combines the benefits of the MBEPP and quantum error correction code and may have potential application in long-distance quantum communication.

Physical Review A•Jun 10, 2022•43 citations

Entanglement Purification and Protection in a Superconducting Quantum Network

Haoxiong Yan, Youpeng Zhong, Hung-Shen Chang +7 more

High-fidelity quantum entanglement is a key resource for quantum communication and distributed quantum computing, enabling quantum state teleportation, dense coding, and quantum encryption. Any sources of decoherence in the communication channel, however, degrade entanglement fidelity, thereby increasing the error rates of entangled state protocols. Entanglement purification provides a method to alleviate these nonidealities by distilling impure states into higher-fidelity entangled states. Here we demonstrate the entanglement purification of Bell pairs shared between two remote superconducting quantum nodes connected by a moderately lossy, 1-meter long superconducting communication cable. We use a purification process to correct the dominant amplitude damping errors caused by transmission through the cable, with fractional increases in fidelity as large as 25%, achieved for higher damping errors. The best final fidelity the purification achieves is 94.09±0.98%. In addition, we use both dynamical decoupling and Rabi driving to protect the entangled states from local noise, increasing the effective qubit dephasing time by a factor of 4, from 3 to 12 μs. These methods demonstrate the potential for the generation and preservation of very high-fidelity entanglement in a superconducting quantum communication network.

arXiv:2201.10679•Physical Review Letters•Feb 22, 2022•70 citations

Quantum Entanglement-Based Error Correction and Decoding Protocol

Jincheng Zhang

This paper presents a novel protocol for quantum error correction and decoding leveraging the unique properties of quantum entanglement. The core concept involves utilizing multi-particle entanglement to construct an iterative error-correcting code. This code operates through iterative correction cycles combined with quantum measurements, achieving high-fidelity information encoding and decoding despite the detrimental effects of quantum decoherence and noise. The primary innovation lies in the strategic exploitation of multi-body entanglement, a relatively underexplored area in existing quantum error correction schemes. The protocol's performance is evaluated theoretically, demonstrating its potential to significantly improve the reliability of quantum communication and computation. The design incorporates key elements such as parity-check matrices tailored to the entangled state and optimized measurement strategies to minimize information loss during the decoding process. The presented approach represents a significant step towards building practical and robust quantum systems capable of handling the inherent challenges of quantum information processing.

•Sep 2, 2026•0 citations

基于量子纠缠的纠错码设计

Jincheng Zhang

Quantum information is increasingly vital for modern technologies, including secure communication and advanced computation. However, the fragile nature of quantum states makes them susceptible to errors during transmission and storage. This paper proposes a novel quantum error correction (QEC) scheme based on the principle of quantum entanglement, aiming to significantly enhance the security of quantum communication. We detail the design of a QEC protocol utilizing entangled qubit states to detect and correct errors, offering a promising pathway toward building robust quantum networks. The core claim is that this method can achieve high error correction rates and secure quantum communication using the unique properties of entanglement.

•Aug 31, 2026•0 citations

Purification of Logic-Qubit Entanglement

Lan Zhou, Yu‐Bo Sheng

Recently, the logic-qubit entanglement shows its potential application in future quantum communication and quantum network. However, the entanglement will suffer from the noise and decoherence. In this paper, we will investigate the first entanglement purification protocol for logic-qubit entanglement. We show that both the bit-flip error and phase-flip error in logic-qubit entanglement can be well purified. Moreover, the bit-flip error in physical-qubit entanglement can be completely corrected. The phase-flip in physical-qubit entanglement error equals to the bit-flip error in logic-qubit entanglement, which can also be purified. This entanglement purification protocol may provide some potential applications in future quantum communication and quantum network.

arXiv:1511.02344•Scientific Reports•Jul 5, 2016•73 citations
Abstract Quantum entanglement is a fundamental resource for quantum computing, quantum communication, and quantum cryptography. In realistic quantum channels, however, entanglement is highly susceptible to noise and decoherence. Entanglement purification(EP) and quantum error correction (QEC) offer distinct approaches to protecting entanglement against noisy quantum channels. In this work, we propose a hybrid scheme that integrates these two approaches to enhance the protection of entanglement between logical qubits. The scheme exploits both the error-correcting capability of encoded logical qubits and the distillation power of entanglement purification, assuming recovery to the logical codespace after each QEC cycle. This combined approach enables improved entanglement preservation under noisy conditions. The resulting robust logical entanglement is well-suited for applications in quantum communication and quantum cryptography and offers a promising route toward more reliable distributed quantum information processing.
A quantum network is expected to enhance distributed quantum computing and quantum communication over a long distance while providing unconditional security. As quantum entanglement is essential for a quantum network, major issues from various types of noise and decoherence prevent it from being realized, and research has been intensively active to obtain optimal configurations for a quantum network. In this work, we address the performance of a quantum network capable of quantum error correction and entanglement purification. Our results show that one should distribute Bell pairs as fast as possible while balancing the deployment of fidelity enhancement. We also show suitable hybrid strategies in quantum cryptography tasks under some noise regimes that need to use purification and quantum error correction together. Our results suggest that using purification to distribute high fidelity Bell pairs and preserving them for application using quantum error correction is a promising way to achieve a near-term quantum network for secure communication.
Entanglement purification is the distilling of high-quality entanglement from low-quality entanglement and is a key element in the quantum repeater. As a new branch of entanglement purification, the measurement-based entanglement purification protocol (MBEPP) only requires one to perform the Bell state measurement to couple resource states with noisy pairs, and it tolerates more local noise than the conventional purification protocols. Existing MBEPPs usually focus on physical qubit entanglement. In this paper, we propose a measurement-based logical qubit entanglement purification protocol (MBLEPP) with quantum nondemolition detection (QND), where the qubit is encoded in the quantum parity code. The results show that this MBLEPP can also work with photon loss under the conditions that each block of the logical Bell state measurement contains at least one physical qubit, that at least one of the blocks is intact, and that the entanglement exists between all blocks. Moreover, we also consider the MBLEPP with imperfect QND. We show that below a certain QND error threshold, this MBLEPP can still work. In this way, this MBLEPP not only obtains high-fidelity entanglement but also tolerates photon loss and the error from imperfect QND. This MBLEPP combines the benefits of the MBEPP and quantum error correction code and may have potential application in long-distance quantum communication.
High-fidelity quantum entanglement is a key resource for quantum communication and distributed quantum computing, enabling quantum state teleportation, dense coding, and quantum encryption. Any sources of decoherence in the communication channel, however, degrade entanglement fidelity, thereby increasing the error rates of entangled state protocols. Entanglement purification provides a method to alleviate these nonidealities by distilling impure states into higher-fidelity entangled states. Here we demonstrate the entanglement purification of Bell pairs shared between two remote superconducting quantum nodes connected by a moderately lossy, 1-meter long superconducting communication cable. We use a purification process to correct the dominant amplitude damping errors caused by transmission through the cable, with fractional increases in fidelity as large as 25%, achieved for higher damping errors. The best final fidelity the purification achieves is 94.09±0.98%. In addition, we use both dynamical decoupling and Rabi driving to protect the entangled states from local noise, increasing the effective qubit dephasing time by a factor of 4, from 3 to 12 μs. These methods demonstrate the potential for the generation and preservation of very high-fidelity entanglement in a superconducting quantum communication network.
This paper presents a novel protocol for quantum error correction and decoding leveraging the unique properties of quantum entanglement. The core concept involves utilizing multi-particle entanglement to construct an iterative error-correcting code. This code operates through iterative correction cycles combined with quantum measurements, achieving high-fidelity information encoding and decoding despite the detrimental effects of quantum decoherence and noise. The primary innovation lies in the strategic exploitation of multi-body entanglement, a relatively underexplored area in existing quantum error correction schemes. The protocol's performance is evaluated theoretically, demonstrating its potential to significantly improve the reliability of quantum communication and computation. The design incorporates key elements such as parity-check matrices tailored to the entangled state and optimized measurement strategies to minimize information loss during the decoding process. The presented approach represents a significant step towards building practical and robust quantum systems capable of handling the inherent challenges of quantum information processing.
Quantum information is increasingly vital for modern technologies, including secure communication and advanced computation. However, the fragile nature of quantum states makes them susceptible to errors during transmission and storage. This paper proposes a novel quantum error correction (QEC) scheme based on the principle of quantum entanglement, aiming to significantly enhance the security of quantum communication. We detail the design of a QEC protocol utilizing entangled qubit states to detect and correct errors, offering a promising pathway toward building robust quantum networks. The core claim is that this method can achieve high error correction rates and secure quantum communication using the unique properties of entanglement.
Recently, the logic-qubit entanglement shows its potential application in future quantum communication and quantum network. However, the entanglement will suffer from the noise and decoherence. In this paper, we will investigate the first entanglement purification protocol for logic-qubit entanglement. We show that both the bit-flip error and phase-flip error in logic-qubit entanglement can be well purified. Moreover, the bit-flip error in physical-qubit entanglement can be completely corrected. The phase-flip in physical-qubit entanglement error equals to the bit-flip error in logic-qubit entanglement, which can also be purified. This entanglement purification protocol may provide some potential applications in future quantum communication and quantum network.