Abstract
We present a technique for hyperentangled Bell-state analysis that only relies on linear optics and is assisted by auxiliary entangled states. This technique can be used to implement hyperdense coding with an experimentally realizable two-photon state hyperentangled in polarization and two longitudinal-momentum degrees of freedom. The 16 hyperentangled states in the first two degrees of freedom are classified into 12 groups with the help of the third degree of freedom. This allows the transmission of 3.58 bits/photon via our hyperdense coding scheme. We also generalize our technique to -qubit hyperentangled Bell-state analysis assisted by additional auxiliary entangled states. We show that given degrees of freedom, the hyperentangled Bell states can be separated via linear optics into groups with the help of ancillary entangled states. When , all hyperentangled states can be distinguished. Our results are useful for quantum information processing based on hyperentanglement.
- Received 20 June 2017
DOI:https://doi.org/10.1103/PhysRevA.96.020303
©2017 American Physical Society