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arXiv 1508.07910quant-ph
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诱骗态下的盲量子计算

Blind Quantum Computing with Decoy States

Ke Xu, Hoi-kwong Lo

摘要:

本文研究了通用盲量子计算(UBQC)协议和远程盲量子比特态制备(RBSP)协议,前者允许客户端在远程量子服务器上进行量子计算,后者允许客户端在服务器上用弱相干脉冲制备单量子比特。该RBSP协议对于小的$ T $是低效的,因为用于生成一个单个量子比特的所需脉冲数量按$ \mbox{O}(1/T^4) $缩放,其中$ T $是客户端和服务器之间的量子信道的透射率。我们在本文中的贡献是一个修改的RBSP协议与诱饵状态。这个新协议允许我们在一个实例中同时生成$ S $单个量子比特。利用我们的新方案,我们能够将产生一个单量子比特所需的弱相干脉冲的数量从$ \mbox{O}(1/T^4) $减少到接近$ \mbox{O}(1/T) $,显著提高了效率。对于损耗为0.2dB/km的100 km标准电信光纤,我们的方法给出了六个数量级的速度改进,这是非常显著的。

英文摘要:

In this paper, we study the Universal Blind Quantum Computing (UBQC) protocol, which allows a client to perform quantum computation on a remote quantum server and the Remote Blind qubit state Preparation (RBSP) protocol which allows the client to prepare single qubits on the server's location with week coherent pulses. This RBSP protocol is inefficient for small $ T $, because the required number of pulses for generating one single qubit scales as $ \mbox{O}(1/T^4) $, where $ T $ is the transmittance of the quantum channe between the client and the server. Our contribution in this paper is a modified RBSP protocol with decoy states. This new protocol allows us to generate $ S $ single qubits simultaneously in a single instance. With our new rotocol, we are able to reduce the number of weak coherent pulses required for generating one single qubit from $ \mbox{O}(1/T^4) $ to nearly $ \mbox{O}(1/T) $, significantly increasing the efficiency. For a 100 km standard telecom fiber of loss 0.2 dB/km, our method gives a six orders of magnitude improvement in the speed, which is very significant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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