Research On General Quantum Secure Protocols With Multiple Controllers

There is an urgent demand for information transfer with the development of social life.Classical communication can’t meet the requirements any more under the consideration ofabsolutely secure communication. Quantum information science combined with quantummechanics and information science emerged in the1980s and made great progressexperimentally and theoretically.Our paper mainly deals with the protocols of quantum secret sharing and quantumcloning.1. We present a five-party scheme for sharing a single-qutrit state by using GHZ statesas the quantum channel. We also sketch the generation of five-party scheme to thecase of multi-qudit states and multiple participants by a composite channel composedof generalized Bell states and GHZ states. We also present a detailed mathematic proof.2. We propose a scheme where one can realize quantum cloning of an unknownmuti-qudit state. The scheme includes a muti-qudit state teleportation at the cloner’ssite and cloning of the state by three methods. We also put forward a scheme forteleportation by using non-maximally entangled quantum channel. We also give adetailed mathematic presentation.