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Entanglement-based quantum communication secured by nonlocal dispersion cancellation



Catherine Lee, Zheshen Zhang, Greg Steinbrecher, Hongchao Zhou, Jacob Mower, Tian Zhong, Ligong Wang, Rob Horansky, Varun Verma, Richard Mirin, Francesco Marsili, Matthew Shaw, Sae Woo Nam, Gregory Wornell, Franco N. Wong, Jeffrey Shapiro, Dirk Englund


The principles of quantum mechanics enable new applications that address unsolved problems in communications, computation, and precision measurement. Quantum key distribution (QKD) enables participants to amplify secure information over long distances with unconditional security; no such algorithms have been discovered in classical physics. However, the performance of today's QKD systems is subject to hardware limitations, such as those of available nonclassical-light sources and single-photon detectors. By encoding photons in high-dimensional states, the rate of generating secure information under these technical constraints can be maximized. Here, we demonstrate a complete QKD system that generates up to 3.2 bits of secure information per detected photon coincidence with proven security against the broad class of arbitrary collective attacks. The security of the system is based on nonlocal dispersion cancellation between two entangled photons. This work represents a major step toward resource-efficient QKD networks.
Physical Review A


quantum key distribution, single photon detectors, SNSPD, superconducting detectors


Lee, C. , Zhang, Z. , Steinbrecher, G. , Zhou, H. , Mower, J. , Zhong, T. , Wang, L. , Horansky, R. , Verma, V. , Mirin, R. , Marsili, F. , Shaw, M. , Nam, S. , Wornell, G. , Wong, F. , Shapiro, J. and Englund, D. (2014), Entanglement-based quantum communication secured by nonlocal dispersion cancellation, Physical Review A, [online],, (Accessed April 23, 2024)
Created December 21, 2014, Updated October 12, 2021