| Secure communication is becoming more and more important in today’s increasingly growing information security.The classical cryptography improves the computational complexity through prime factorization and other methods.Quantum cryptography makes use of quantum state uncertainty and no-cloning theorem to achieve secure communication.The interaction-free system based on quantum Zeno effect can effectively realize the secure communication between sender and receiver.At the same time,interaction-free measurement based on quantum Zeno effect shows important application potential in the detection of light-sensitive matter.However,interaction-free efficiency and poor stability limit the development of interaction-free systems.In this paper,interaction-free system based on the interferometer is used as research object.We introduce the vortex beam as the incident light source of the system,and make use of the degree of freedom of its orbital angular momentum to achieve efficient non-interaction measurement and stronger anti-interference ability of the system.The chapters of this thesis are organized as follows:In the first chapter,the development course from classical communication to quantum communication encryption is summarized,and introduces the interaction-free effect and Zeno effect respectively.which is the foundation for the non-interaction system of quantum Zeno effect.In the second chapter,the optical beam splitter is used to combine the interaction-free system with the quantum Zeno effect.Under the transmission matrix theory,the evolution of photons in interaction-free systems is described,and counterfactual secure communication is introduced.In the third chapter,we introduce the traditional type of vortex beam and its generation method.Combined with the orbital angular momentum of vortex beam,we propose an interaction-free measurement protocol of internal and external interferometers,which can quickly improve the interaction-free efficiency of the system under limited optical devices. |
