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Heralded entanglement between error-protected logical qubits for fault-tolerant distributed quantum computing
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作者 Jialun Li Zhihao Xie +3 位作者 Yachen Li Yansen Liang Zhenhua Li Tao Li 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2024年第2期25-33,共9页
Quantum error correction is essential for achieving reliable quantum information processing tasks,as it can mitigate the detrimental effects of noise by encoding single-qubit information into a larger quantum system.H... Quantum error correction is essential for achieving reliable quantum information processing tasks,as it can mitigate the detrimental effects of noise by encoding single-qubit information into a larger quantum system.However,the generation of distributed entanglement between logical qubits located within two spatially separated nodes presents a significant resource-intensive challenge that has yet to be overcome.Here we present a heralded protocol for generating distributed entanglement between two nonlocal error-protected logical qubits.A high-dimensional single photon can evolve physical qubits into a logical qubit that entangles with the photon and then converts logical qubit-photon entanglement into entanglement between two logical qubits,when the photon state is properly tuned and an effective photon-spin interface between single photons and individual spins is exploited.Furthermore,the success of the entanglement generation is heralded by the detection of the photon,and the corresponding efficiency can,in principle,approach unity.These distinguished features make our protocol highly appealing for future large-scale quantum technologies. 展开更多
关键词 quantum networks distributed entanglement error-protected logical qubits high-dimensional photons
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Knotted Pictures of Hadamard Gate and CNOT Gate
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作者 GU Zhi-Yu QIAN Shang-Wu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第6期967-972,共6页
This paper obtains the knotted pictures of Hadamard gate and CNOT gate in terms of surgical operations described in knot theory.
关键词 two qubit quantum logic gate surgical operations in knot theory knotted picture
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Knotted Picture of Single Qubit Quantum Logic Gate
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作者 GU Zhi-Yu QIAN Shang-Wu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第5期769-772,共4页
This paper briefly introduces the five types of the surgical operations in knot theory and obtains the expression of single qubit quantum logic gate in terms of these surgical operations.
关键词 single qubit quantum logic gate surgical operations in knot theory knotted picture
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