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Full quantum capability devices can provide secure communications, but theyare challenging to make portable given the current technology. Besides,classical portable devices are unable to construct communication channelsresistant to quantum computers. Hence, communication security on portabledevices cannot be guaranteed. Semi-Quantum Communication (SQC) attempts tobreak the quandary by lowering the receiver's required quantum capability sothat secure communications can be implemented on a portable device. However,all SQC protocols have low qubit efficiency and complex hardwareimplementations. The protocols involving quantum entanglement require linearEntanglement Preservation Time (EPT) and linear quregister size. In this paper,we propose two new keyless SQC protocols that address the aforementionedweaknesses. They are named Economic Keyless Semi-Quantum Point-to-pointCommunication (EKSQPC) and Rate Estimation EKSQPC (REKSQPC). They achievetheoretically constant minimal EPT and quregister size, regardless of messagelength. We show that the new protocols, with low overhead, can detect Measureand Replay Attacks (MRAs). REKSQDC is tolerant to transmission impairments andenvironmental perturbations. The protocols are based on a new quantum messagetransmission operation termed Tele-Fetch. Like QKD, their strength depends onphysical principles rather than mathematical complexity.

Keyless Semi-Quantum Point-to-point Communication Protocol with Low Resource Requirements