Protocol of Quantum Communication Based on Shared Qubits

We propose a protocol of quantum teleportation based on shared qubits. The plaintext is divided into blocks with same length, and represented by the eigenstates under Z-measurements. The ciphertext is encryted by a special circuit, which is determined by the former block of palintext. We demonstrate details of the method in a scenario where Alice and Bob attempts to communicate via several shared qubits under this protocol. Meanwhile, an eavesdropping is introduced to test its safety against wiretapping. Performance of the method is estimated based on theoretical analysis and numerical simulation.