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有興趣的人
日期 |
2025-08-18 |
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時間 |
14:00-15:00 |
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地點 |
前沿量子科技研究中心2樓演講廳 |
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領域 |
Quantum Information Science |
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講者 |
Aurél Gábor Gábris 教授 - Department of Physics in Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague |
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題目 |
Universal and unambiguous preparation of Bell pairs |
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摘要 |
The ability of preparing perfect Bell pairs with a practical scheme is of great relevance for quantum communication as well as distributed quantum computing. We propose a scheme which probabilistically, but universally and unambiguously produces the $ket{Phi_{+}}$ Bell pair from four copies of qubit pairs initially in the same unknown pure quantum state. The same scheme, extended to eight qubit pairs initially in the same, moderately mixed quantum state, unambiguously produces the $ket{Phi_{+}}$ Bell pair with quadratically suppressed noise. The core step of the proposed scheme consists of a pair of local two-qubit operations applied at each of the two distant locations, followed by a partial projective measurement and postselection at each party, with results communicated classically. While the scheme resembles standard entanglement distillation protocols, it achieves success within just three iterations, making it attractive for real-world applications. |
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