Systems, apparatuses, methods, and computer program products are disclosed for PQC. An example method includes transmitting a first portion of an electronic communication to a client device over a non-PQC communications channel. The example method further includes transmitting a quantum cryptographic key to the client device over a quantum communications channel and authenticating a session with the client device over the non-PQC communications channel based on the quantum cryptographic key. Subsequently, the example method includes, in response to authentication of the session with the client device, transmitting a second portion of the electronic communication to the client device over a PQC communications channel. In some instances, the first portion of the electronic communication may comprise overhead data, and the second portion of the electronic communication may comprise payload data.