Research On Theory And Application Of Some Quantum Communication Tasks

The development of quantum information science has perfectly integrated the principles of quantum mechanics into information science.Quantum methods can solve the effects that cannot be achieved by classical methods.As a kind of particle with the fastest transmission speed and the weakest coupling with the environment,photon is often used as the carrier of quantum state.This paper mainly discusses several common quantum communication tasks.In this paper,we first introduce some related background and research significance of quantum information,and briefly introduce some basic concepts involved in quantum communication tasks.In the second chapter,we mainly introduce the hardware system involved in the optical quantum communication task.First,we have a basic understanding of qubits.Then we introduce the common optical devices,state preparation state measurement components and common interferometers in the laboratory.Finally,two kinds of entangled optical sources in the laboratory are described.In the third chapter,we mainly describes two different types of quantum access codes.The first type is quantum random access codes that use single qubits as resources.It is proved through specific theoretical deductions that the use of quantum methods to carry classical information will reach beyond traditional methods.The following results can be achieved;the second type is the entanglementassisted random access code task,and the experimental feasibility of this type of access code scheme is demonstrated through the analysis of examples.The fourth chapter is the expansion of the third chapter model.By analyzing the theory of 2 → 1 quantum random access code as quantum resource,we prove the superiority of quantum and weak measurement in the situation of resource acquisition and interference.Then we extend it to the case of 3 → 1,and carry out relevant analysis and research,and find different conclusions from previous studies,i.e.the weak measurement is not always superior.The fifth chapter mainly introduces a kind of communication task based on quantum digital signature.This paper attempts to apply the principle of quantum digital signature to the actual production and life,and develops a mailbox system following the execution process of quantum digital signature.The attempt of this paper provides a meaningful reference value for the practical application of quantum theory.