中科大研究人员实现多功能固态量子存储 诸平 据物理学家组织网2018年8月24日转载来自 中国科技大学 （University of Science and Technology of China）的消息，中科大的研究人员实现了多功能固态量子存储。相关研究成果已经在《自然通讯》（ Nature Communications ）杂志网站发表。此项成果是由中科院量子信息重点实验室（CAS Key Lab of Quantum Information）的李成峰（Li Chengfeng音译，似乎应该是 李传峰 ）、周宗权（Zhou Zongquan)等人合作完成的。他们开发出了一种多自由度(multi-degree-of-freedom，DOF)多路复用固态量子存储,并演示了光子脉冲操作函数随时间和频率DOFs的变化。 Credit: CC0 Public Domain 更多信息请注意浏览原文或者相关报道 Researchers achieve multifunctional solid-state quantum memory August 24, 2018, University of Science and Technology of China The team of Li Chengfeng, Zhou Zongquan and others from the CAS Key Lab of Quantum Information developed a multi-degree-of-freedom (DOF) multiplexed solid-state quantum memory, and demonstrated photon pulse operation functions with time and frequency DOFs. The results were published in Nature Communications recently. The reliable storage and coherent manipulation of quantum states with matter-systems enable the construction of large-scale quantum networks based on a quantum repeater. To achieve useful communication rates, highly multi-mode quantum memories will be required to construct a multiplexed quantum repeater. The team presented the first demonstration of the on-demand storage of orbital-angular-momentum states with weak coherent pulses at the single-photon-level in a rare-earth-ion doped crystal. Through the combination of this 3-dimensional spatial DOF with 2-dimensional temporal and 2-dimensional spectral DOFs, the team created a multiple-DOF memory with high multi-mode capacity up to 3*2*2=12. This device can also serve as a quantum mode converter with high fidelity, which is the fundamental requirement for the construction of a multiplexed quantum repeater. The team further demonstrated that the device can perform arbitrary pulse operations within time and frequency DOF. Representative operations include pulse sequencer, multiplexer, selective spectral shifter and configurable beam splitter. The experimental results showed that in all these operations, the three-dimensional quantum states carried by photons maintained a fidelity of about 89%. This memory device can achieve all operations required for Knill-Laflamme-Milburn type quantum computation, so it may be expected to find application in the field of linear optical quantum computing. Explore further: 18-qubit entanglement sets new record
标签: 量子存储
