  This paper presents a new encryption scheme called Compact Coding that
encodes information in time, phase, and intensity domains, simultaneously.
While these approaches have previously been used one at a time, the proposed
scheme brings to bear for the first time their strengths simultaneously leading
to an increase in the secure information transfer rate. The proposed scheme is
applicable to both optical fibers and free space optics, and can be considered
as an alternative to polarization coding. This paper applies the proposed
compact coding scheme to multi-photon tolerant quantum protocols in order to
produce quantum-level security during information transfer. We present the
structure of the proposed coding scheme in a multi-photon environment and
address its operation.
