  Several quantum cryptographic schemes have been proposed and realized
experimentally in the past. However, even with an advancement in quantum
technology and escalated interest in the designing of direct secure quantum
communication schemes there are not many experimental implementations of these
cryptographic schemes. In this paper, we have provided a set of optical
circuits for such quantum cryptographic schemes, which have not yet been
realized experimentally by modifying some of our theoretically proposed secure
communication schemes. Specifically, we have proposed optical designs for the
implementation of two single photon and one entangled state based controlled
quantum dialogue schemes and subsequently reduced our optical designs to yield
simpler designs for realizing other secure quantum communication tasks, i.e.,
controlled deterministic secure quantum communication, quantum dialogue,
quantum secure direct communication, quantum key agreement, and quantum key
distribution. We have further proposed an optical design for an entanglement
swapping based deterministic secure quantum communication and its controlled
counterpart.
