Scalable quantum computing with atomic ensembles
Scalable quantum computing with atomic ensembles
复制标题
DOI：
10.1088/1367-2630/12/9/093032
复制
发表时间：
2010-09-22
影响因子：
3.3
通讯作者：
Stace, Thomas M.
中科院分区：
文献类型：
--
作者：
Barrett, Sean D.;Rohde, Peter P.;Stace, Thomas M.
原子系综由激光场寻址的原子云组成，为量子信息的存储和原子与光学自由度之间的量子信息相干转换提供了一个有吸引力的系统。我们描述了一种基于原子系综的全尺度量子计算方案，在该方案中，量子比特被编码为多个原子的对称集体激发。我们考虑了误差的最重要来源--不完美的激子--光子耦合和光子损失--并且证明了该方案对这些过程是非常健壮的：所需的光子发射和收集效率阈值大于或接近86%。我们的方案使用的方法与在量子中继器方案中已经实验证明的方法相似，但信息处理能力远远超过这些方案。
Atomic ensembles, comprising clouds of atoms addressed by laser fields, provide an attractive system for both the storage of quantum information and the coherent conversion of quantum information between atomic and optical degrees of freedom. We describe a scheme for full-scale quantum computing with atomic ensembles, in which qubits are encoded in symmetric collective excitations of many atoms. We consider the most important sources of error-imperfect exciton-photon coupling and photon losses-and demonstrate that the scheme is extremely robust against these processes: the required photon emission and collection efficiency threshold is greater than or similar to 86%. Our scheme uses similar methods to those already demonstrated experimentally in the context of quantum repeater schemes and yet has information processing capabilities far beyond those proposals.