1 research outputs found
Complete nondestructive analysis of two-photon six-qubit hyperentangled Bell states assisted by cross-Kerr nonlinearity
Hyperentanglement, the entanglement in several degrees of freedom (DOFs) of a
quantum system, has attracted much attention as it can be used to increase both
the channel capacity of quantum communication and its security largely. Here,
we present the first scheme to completely distinguish the hyperentangled Bell
states of two-photon systems in three DOFs with the help of cross-Kerr
nonlinearity without destruction, including two longitudinal momentum DOFs and
the polarization DOF. We use cross-Kerr nonlinearity to construct quantum
nondemolition detectors which can be used to make a parity-check measurement
and analyze Bell states of two-photon systems in different DOFs. Our complete
scheme for two-photon six-qubit hyperentangled Bell-state analysis may be
useful for the practical applications in quantum information, especially in
long-distance high-capacity quantum communication.Comment: 11 pages, 5 figures, one colum