| Quantum communication has incomparable advantages over traditional information due to its unique entanglement and non-classical properties.Quantum state plays an important role in the field of quantum communication,and the process of quantum communication is the preparation and operation of quantum states.Quantum key is the premise to guarantee the security of quantum communication which the security is based on the basic laws of quantum mechanics,and it has been proved strictly by scientists.Nowadays quantum communication has attracted more and more attention in the scientific world.In the paper,we first introduce the research background ?significance and the development of quantum communication,then we also introduce the basic concepts of quantum mechanics and quantum optics,and the quantum key distribution protocol,especially the decoy-state quantum key distribution.After introducing the basics of quantum secure communication,we propose some related schemes for the preparation?manipulation and application of non-classical states.In the paper,we first put forward a scheme for the preparation and manipulation of arbitrary bi-photon superposition state with linear optics,and analyze the final target states by the Wigner function and the state fidelity.Our simulation results demonstrate that not only distinct non-classical characteristics but also very high state fidelities can be achieved even under imperfect experimental conditions.Then we investigate the application of non-classical light in decoy-state quantum key distribution with SARG04 protocol.By carrying out corresponding theoretical derivation and numerical simulations,the results demonstrate that the SARG04 decoy-state scheme based on non-classical heralded single photon source still has the higher secure key rate and longer transmission distance even considering the realistic conditions(the finite numbers of photon pulses),and the parameter optimization method can improve the secure key rate. |
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