报告题目：Realization of Quantum state transfer and Quantum gates by use of single photons with different degrees of freedom

报告人：李福利 教授（西安交通大学）

报告时间：2023年5月19日（周五）下午4:00

报告地点：光电所二层报告厅

报告摘要：  

A photon has multiple different degrees of freedom(DoF) such as polarization (spin), orbital angular momentum (OAM), paths, frequencies and so on. All of these DoFs can be employed to code information. In this way, a single photon can be used to be as multi qubits with different DoFs. In this talk, I shall present our recent work on quantum teleportation and quantum gates based on a single photon with different DoFs. Quantum teleportation is a useful quantum information technology to transmit a quantum state between two objects locating different places. In this study, we perform a quantum state transfer experiment in the linear optical system, transferring a single-photon state in the polarization degree of freedom (DoF) to another photon in the orbital angular momentum (OAM) quantum state via a biphoton OAM entangled channel. Quantum controlled-logic gates, including controlled NOT gate and Toffoli gate, play critical roles in lots of quantum information processing schemes. We design and experimentally demonstrate deterministic Toffoli gate by utilizing orbital-angular-momentum and polarization degrees of freedom of a single photon. We also propose and experimentally implement quantum Fredkin gate in a single-photon hybrid-degrees-of-freedom system. Besides, we find that a kind of Greenberger-Horne-Zeilinger-like states can be prepared by using our quantum Fredkin gate. I shall also talk about the investigations on Kochen-Specker-type quantum contextuality, Hardy-like quantum pigeonhole paradoxes and high-dimensional quantum steering from a Noisy Environment with a single photon of different DoFs.

报告人简介：  

李福利，1988年获得南京大学理论物理专业博士学位，现任西安交通大学物理学院教授，博士生导师，西安交通大学学位委员会副主任。主要从事量子光学和量子信息与量子计算等方面的研究工作，先后主持完成包括国家自然科学基金重点、面上和国家重大研究计划（973）等10余项科研项目；在Nature Comm., Phys. Rev. Lett., Phys. Rev.等重要物理期刊发表学术论文200余篇；入选国家教育部跨世纪优秀人才培养计划; 陕西省“三五”人才计划 ； 获得国务院政府特殊津贴； 国家教育部科技进步二等奖；陕西省科学技术一等奖；陕西省教学成果一等奖；国家教学成果二等奖；宝钢全国优秀教师奖;陕西省优秀留学回国人员。