General Quantum Entanglement Purification Protocol using a Controlled‐Phase‐Flip Gate,Annalen Der Physik

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General Quantum Entanglement Purification Protocol using a Controlled‐Phase‐Flip Gate
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-03-16 , DOI: 10.1002/andp.202000011
Lu‐Cong Lu _{1,

2} , Bao‐Cang Ren ₂ , Xin Wang ₁ , Mei Zhang ₁ , Fu‐Guo Deng _{1,

3}

Affiliation

Entanglement purification is an important method to guarantee the fidelity of long‐distance quantum communication. Here, a general entanglement purification protocol (EPP) for mixed state with bit‐flip error and phase‐flip error is proposed, resorting to unilateral operations and a controlled‐phase‐flip (CPF) gate. The CPF gate is working with a high fidelity under balance condition of quantum dot embedded in a double‐sided optical cavity. This general EPP scheme can purify the mixed state with both bit‐flip error and phase‐flip error to a high fidelity entangled state relatively fast in some regimes, owing to the unilateral operations and high‐fidelity CPF gate, which can largely decrease the resource consumption. This general EPP provides a convenient way for increasing the entanglement of different quantum systems, which has great potential for guaranteeing the fidelity of long‐distance quantum communication in the future.

中文翻译：

使用可控相位翻转门的通用量子纠缠纯化协议

纠缠纯化是保证长距离量子通信保真度的重要方法。在此，提出了一种针对单态操作和受控相位翻转（CPF）门的混合态纠缠纯化协议（EPP），该协议具有位翻转误差和相翻转误差。CPF门在嵌入双面光腔的量子点的平衡条件下以高保真度工作。由于单边操作和高保真CPF门，这种通用EPP方案可以在某些情况下将位翻转误差和相位翻转误差的混合状态相对快地纯化为高保真纠缠态，这可以大大减少资源消费。这种一般的EPP提供了一种方便的方法来增加不同量子系统的纠缠，

更新日期：2020-03-16

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