Resource Costs for Fault-Tolerant Linear Optical Quantum Computing

被引：97

作者：

Li, Ying ^{[1
]}

Humphreys, Peter C. ^{[2
]}

Mendoza, Gabriel J. ^{[3
,4
]}

Benjamin, Simon C. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PH, England

[3] Univ Bristol, Ctr Quantum Photon, HH Wills Phys Lab, Bristol BS8 1UB, Avon, England

[4] Univ Bristol, Dept Elect & Elect Engn, Bristol BS8 1UB, Avon, England

来源：

PHYSICAL REVIEW X | 2015年 / 5卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

COMPUTATION; CIRCUIT; ENTANGLEMENT; EFFICIENT; ARRAY;

D O I：

10.1103/PhysRevX.5.041007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Linear optical quantum computing (LOQC) seems attractively simple: Information is borne entirely by light and processed by components such as beam splitters, phase shifters, and detectors. However, this very simplicity leads to limitations, such as the lack of deterministic entangling operations, which are compensated for by using substantial hardware overheads. Here, we quantify the resource costs for full-scale LOQC by proposing a specific protocol based on the surface code. With the caveat that our protocol can be further optimized, we report that the required number of physical components is at least 5 orders of magnitude greater than in comparable matter-based systems. Moreover, the resource requirements grow further if the per-component photon-loss rate is worse than 10(-3) or the per-component noise rate is worse than 10(-5). We identify the performance of switches in the network as the single most influential factor influencing resource scaling.

引用

页数：15