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报告时间：9月26日 周三  下午3:00

报告地点：实验室一楼会议室

报告人：胡晓敏（实验室博士后）

报告题目： Beating the channel capacity limit for superdense coding with entangled ququarts

报告摘要： 

     Quantum superdense coding protocols enhance channel capacity by using shared quantum entanglement between two users. The channel capacity can be as high as 2 when one uses entangled qubits. However, this limit can be surpassed by using high-dimensional entanglement. We report an experiment that exceeds the limit using high-quality entangled ququarts with fidelities up to 0.98, demonstrating a channel capacity of 2.09 ± 0.01. Themeasured channel capacity is also higher than that obtained when transmitting only one ququart. We use the setup to transmit a fivecolor image with a fidelity of 0.952. Our experiment shows the great advantage of high-dimensional entanglement and will stimulate research on high-dimensional quantum information processes.

报告人简介： 

     胡晓敏博士长期从事高维光子纠缠态的制备和应用。通过利用路径编码，他们实现了保真度高达97.5%的两光子三维纠缠态，并首次检验了无相容性漏洞的量子互文性（PRL, 2016）；他们进一步简化三维纠缠源的设计，提高了光源的性能，实验证实了量子力学中强于二值关联的存在（PRL, 2018）。最近他们进一步制备出偏振-路径复合的四维纠缠源，保真度高达98%，并实验演示了量子密集编码，把量子密集编码的信道容量记录提升到2.09。相关工作发表在Science Advances上。胡晓敏博士的科研经历清晰地展示了从搭建一个实验系统到应用该实验系统来解决重要科学问题的流程。