Fault Tolerant Multi-Party Authenticated Quantum Conference Against Collective Noise

With the advent of new science and technology, teleconference, which allows multiple participants to communicate directly without being constrained by time and distance, is becoming extremely popular. We put forward two fault tolerant three-party authenticated quantum conference protocols based on channel-encryption against collective-dephasing noise and collective-rotation noise, respectively. Whereafter, we further extend these two protocols to the most common scenario containing n participants. Compared with existing quantum conference protocols, ours own three outstanding merits: firstly, these protocols can meet the requirements of the interactivity of quantum conference well, because the previously shared quantum key can be reused many times; secondly, we introduce an updating mechanism for withstanding the special entanglement attack effectively; and thirdly, an efficient method is presented to realize the distribution of multi-qubit entangled states under collective noise environment.