Harnessing high-dimensional hyperentanglement through a biphoton frequency comb

• Main Authors: Xie, Zhenda (Author), Zhong, Tian (Contributor), Shrestha, Sajan (Author), Xu, XinAn (Author), Liang, Junlin (Author), Gong, Yan-Xiao (Author), Bienfang, Joshua C. (Author), Restelli, Alessandro (Author), Shapiro, Jeffrey H. (Contributor), Wong, Franco N. C. (Contributor), Wei Wong, Chee (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science (Contributor), Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor)
• Format: Article
• Language: English
• Published: Nature Publishing Group, 2016-02-01T21:17:30Z.
• Subjects: Article
• Online Access: Get fulltext

 Quantum entanglement is a fundamental resource for secure information processing and communications, and hyperentanglement or high-dimensional entanglement has been separately proposed for its high data capacity and error resilience. The continuous-variable nature of the energy-time entanglement makes it an ideal candidate for efficient high-dimensional coding with minimal limitations. Here, we demonstrate the first simultaneous high-dimensional hyperentanglement using a biphoton frequency comb to harness the full potential in both the energy and time domain. Long-postulated Hong-Ou-Mandel quantum revival is exhibited, with up to 19 time-bins and 96.5% visibilities. We further witness the high-dimensional energy-time entanglement through Franson revivals, observed periodically at integer time-bins, with 97.8% visibility. This qudit state is observed to simultaneously violate the generalized Bell inequality by up to 10.95 standard deviations while observing recurrent Clauser-Horne-Shimony-Holt S-parameters up to 2.76. Our biphoton frequency comb provides a platform for photon-efficient quantum communications towards the ultimate channel capacity through energy-time-polarization high-dimensional encoding.