Quantum Nonlocallity Protecting the Secure Direct Communication Against Destroying-Travel-Qubit-Type Attack

We present a real one-time-pad key communication protocol that allows the secure direct communication. With the quantum nonlocality, Alice and Bob (the communicators) can send message to each other in a deterministic manner by using local operations and a reliable public channel. The security of this protocol is based on the ‘High fidelity implies low entropy’. Actually, the eavesdropper-Eve can use a denial-of-service attack to destroy a quantum communication. In a realistic communication protocol, one has to face such question that Eve destroys the travel qubit to stop the communication. In this protocol, Alice and Bob only use local operations and public channel to communicate with each other in a deterministic manner when the entanglement was successfully shared. In principle, this protocol can protect the communication against the destroying-travelqubit-type attack with the quantum nonlocality, which allows our protocol to be practical. And we discuss its practicality with the current technologies.