# Deterministic secure quantum communication with and without entanglement

## TL;DR

This paper introduces a one-way quantum communication protocol that ensures security through layered detection, using entangled or separate photons, without needing quantum memory, and encrypts messages with a quantum key.

## Contribution

It proposes a novel one-way quantum secure communication protocol that does not require quantum memory and can operate with or without entanglement.

## Key findings

- Secure message transmission with layered eavesdropper detection
- Protocol operates with or without entanglement
- No quantum memory needed

## Abstract

We present a protocol for sending a message over a quantum channel with different layers of security that will prevent an eavesdropper from deciphering the message without being detected. The protocol has two versions where the bits are encoded in either pairs of entangled photons or separate photons. Unlike many other protocols, it requires a one-way, rather than a two-way, quantum channel and does not require a quantum memor. A quantum key is used to encrypt the message and both the key and the message are sent over the quantum channle with the same quantum encoding technique. The key is sent only if no eavesdropper is detected.