A novel communication protocol based on entangled qubits enables secure direct communication between two parties without requiring a shared secret key. The protocol ensures security against both active and passive eavesdropping attacks, with a detection rate of at least 25% for active attacks. It achieves a quantum efficiency of 1 bit per qubit transmitted, making it highly efficient. The protocol uses entanglement, with Alice preparing and measuring Bell pairs, and storing one qubit for a short time. The security is ensured through the use of entanglement and the detection of discrepancies in quantum measurements. The protocol is compared to other quantum communication schemes, such as BB84 and Ekert, which have lower quantum efficiency and require additional classical channels for key exchange. The proposed protocol, called double dense coding, allows for the transmission of 4 bits of information using one entangled qubit, resulting in a quantum transmission rate of 2 bits per qubit. This is achieved by using entanglement to encode information in both qubits, allowing for efficient and secure communication. The protocol is also secure against man-in-the-middle attacks, as it uses a public channel to detect any discrepancies in the quantum measurements. The protocol includes a control mode that allows for the detection of eavesdropping attempts by checking for correlations between measurements. The protocol is asymptotically secure against both active and passive attacks, with the probability of undetected eavesdropping decreasing exponentially with the number of protocol runs. The protocol is supported by references to other quantum communication schemes and is backed by research from various institutions.A novel communication protocol based on entangled qubits enables secure direct communication between two parties without requiring a shared secret key. The protocol ensures security against both active and passive eavesdropping attacks, with a detection rate of at least 25% for active attacks. It achieves a quantum efficiency of 1 bit per qubit transmitted, making it highly efficient. The protocol uses entanglement, with Alice preparing and measuring Bell pairs, and storing one qubit for a short time. The security is ensured through the use of entanglement and the detection of discrepancies in quantum measurements. The protocol is compared to other quantum communication schemes, such as BB84 and Ekert, which have lower quantum efficiency and require additional classical channels for key exchange. The proposed protocol, called double dense coding, allows for the transmission of 4 bits of information using one entangled qubit, resulting in a quantum transmission rate of 2 bits per qubit. This is achieved by using entanglement to encode information in both qubits, allowing for efficient and secure communication. The protocol is also secure against man-in-the-middle attacks, as it uses a public channel to detect any discrepancies in the quantum measurements. The protocol includes a control mode that allows for the detection of eavesdropping attempts by checking for correlations between measurements. The protocol is asymptotically secure against both active and passive attacks, with the probability of undetected eavesdropping decreasing exponentially with the number of protocol runs. The protocol is supported by references to other quantum communication schemes and is backed by research from various institutions.