title: Classical hypercorrelation and wave-optics analogy of quantum superdense coding.
abstract: We report the first experimental realization of classical hypercorrelation, correlated simultaneously in every degree of freedom (DOF), from observing a Bell-type inequality violation in each DOF: polarization and orbital angular momentum (OAM). Based on such a classical hypercorrelation, we have realized the analogy of quantum superdense coding in classical optics. Comparing it with quantum superdense coding using pairs of photons simultaneously entangled in polarization and OAM, we find that it exhibits many advantages. It is not only very convenient to realize in classical optics, the attainable channel capacity in the experiment for such a superdense coding can also reach 3 bits, which is higher than that (2.8 bits) of usual quantum one. Our findings can not only give novel insight into quantum physics, they may also open a new field of applications in the classical optical information process.
authors.affiliation: School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing, China.
authors.forename: Pengyun
authors.initials: P
authors.lastname: Li
authors.affiliation: School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing, China.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing, China.
authors.forename: Zhenwei
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing, China.
authors.forename: Xinbing
authors.initials: X
authors.lastname: Song
authors.affiliation: School of Physics, Beijing Institute of Technology and Beijing Key Laboratory of Fractional Signals and Systems, 100081, Beijing, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Zhang