论文标题
通过连贯状态传输的单纠纷纠缠的最佳供应商
Optimal supplier of single-error-type entanglement via coherent-state transmission
论文作者
论文摘要
与多种类型的噪声纠缠相比，仅包括一种错误的纠缠不仅是量子通信的基本资源，而且对于分布式量子计算而言。我们认为通过有损通道上的连贯状态传输呈现远处的单次纠纷的协议。该协议被认为是用于纠缠较大协议以产生最终输出的子例程，例如EBITS或PBIT。在本文中，我们提供了一个子例程协议，该方案可实现典型的共同凸产量函数单调相对于单线分数的典型最佳选择，例如单线分数的任意凸函数和双向脱刀的词汇/钥匙。基于远程非破坏性平价测量协议的纠缠生成[K. Azuma，H。Takeda，M。Koashi和N. Imoto，物理。 Rev. A 85，062309（2012）]被确定为这样的最佳子例程。
Compared with entanglement with multiple types of noise, entanglement including only one type of error is a favorable fundamental resource not only for quantum communication but also for distributed quantum computation. We consider protocol that presents single-error-type entanglement for distant qubits via coherent-state transmission over a lossy channel. This protocol is regarded as a subroutine to serve entanglement for larger protocol to yield a final output, such as ebits or pbits. In this paper, we provide a subroutine protocol which achieves the global optimal for typical jointly convex yield functions monotonically non-decreasing with respect to the singlet fraction, such as an arbitrary convex function of a singlet fraction and two-way distillable entanglement/key. Entanglement generation based on remote non-destructive parity measurement protocol [K. Azuma, H. Takeda, M. Koashi, and N. Imoto, Phys. Rev. A 85, 062309 (2012)] is identified as such an optimal subroutine.
