Bidirectional quantum teleportation based on seven-qubit entangled state in noisy environment

This study proposes a novel asymmetric bidirectional quantum teleportation scheme utilizing a seven-qubit entangled state as the quantum channel. The scheme employs a four-qubit GHZ-state measurement, a Bell-state measurement, and a few Pauli operations to achieve bidirectional quantum state transmission. In this protocol, Alice transmits a four-qubit entangled state to Bob, while Bob simultaneously sends an arbitrary single-qubit state to Alice. Furthermore, an experimental circuit was constructed using the pyQPanda framework on the Origin Quantum platform to verify the correctness and feasibility of the scheme. Simulation results demonstrate the effective realization of bidirectional quantum teleportation. Additionally, the effects of bit-flip noise and amplitude damping noise on the scheme were analyzed, and the transmission fidelity under different noise environments was calculated. Finally, compared with existing bidirectional quantum teleportation schemes, the proposed scheme requires fewer measurements, involves simpler operations, has lower computational complexity, and achieves higher transmission efficiency.