02983nam 2200469 450 991064776910332120230511113123.09789811982880(electronic bk.)978981198287310.1007/978-981-19-8288-0(MiAaPQ)EBC7192181(Au-PeEL)EBL7192181(CKB)26094855900041(DE-He213)978-981-19-8288-0(PPN)26820599X(EXLCZ)992609485590004120230511d2023 uy 0engurcnu||||||||txtrdacontentcrdamediacrrdacarrierDigital quantum information processing with continuous-variable systems /Takaya Matsuura1st ed. 2023.Singapore :Springer,[2023]©20231 online resource (172 pages)Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5061Print version: Matsuura, Takaya Digital Quantum Information Processing with Continuous-Variable Systems Singapore : Springer,c2023 9789811982873 Introduction -- Preliminaries -- Continuous-Variable Quantum System -- Quantum Key Distribution with Continuous-Variable Systems -- Quantum computation with Continuous-Variable Systems.The book provides theoretical methods of connecting discrete-variable quantum information processing to continuous-variable one. It covers the two major fields of quantum information processing, quantum communication and quantum computation, leading to achievement of a long-sought full security of continuous-variable quantum key distribution (QKD) and proposal of a resource-efficient method for optical quantum computing. Firstly, the book provides a security of continuous-variable QKD against arbitrary attacks under a realistic condition such as finite communication rounds and the use of digitized information processing. The book also provides the unified view for conventionally used approximate Gottesman-Kitaev-Preskill (GKP) codes, which encodes qudits on a continuous-variable system, enabling direct comparison between researches based on different approximations. The book finally proposes a resource-efficient method to realize the universal optical quantum computation using the GKP code via the direct preparation of the GKP magic state instead of GKP Pauli states. Feasibility of the proposed protocol is discussed based on the existing experimental proposals for the GKP state preparation.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5061Quantum theoryQuantum theory.016.61483Matsuura Takaya1277941MiAaPQMiAaPQMiAaPQ9910647769103321Digital Quantum Information Processing with Continuous-Variable Systems3012304UNINA