Beating the channel capacity limit for superdense coding with entangled ququarts.
Beating the channel capacity limit for superdense coding with entangled ququarts.
复制标题
使用纠缠四夸特突破超密集编码的通道容量限制
DOI：
10.1126/sciadv.aat9304
复制
发表时间：
2018-07
期刊：
影响因子：
13.6
通讯作者：
Guo GC
中科院分区：
文献类型：
--
作者：
Hu XM;Guo Y;Liu BH;Huang YF;Li CF;Guo GC
高维纠缠超密集编码克服信道容量极限的实验研究。量子超密集编码协议利用两个用户之间共享的量子纠缠来提高信道容量。当使用纠缠量子比特时，信道容量可以高达2。然而，这个极限可以通过使用高维纠缠来超越。我们报告了一个实验，使用高质量的纠缠quququququququarts的结晶度高达0.98，超过了限制，表现出2.09 ± 0.01的通道容量。测得的信道容量也高于仅发送一个四分之一时获得的信道容量。我们使用该设置传输保真度为0.952的五色图像。我们的实验显示了高维纠缠的巨大优势，将促进对高维量子信息过程的研究。
Experimental demonstration of beating the channel capacity limit for superdense coding with high-dimensional entanglement. 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. The measured channel capacity is also higher than that obtained when transmitting only one ququart. We use the setup to transmit a five-color 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.