Digital Quantum Information Processing with Continuous-Variable Systems

The book provides theoretical methods of connecting discrete-variable quantum information processing to continuous-variable one, leading to the achievement of full security of continuous-variable quantum key distribution and the proposal of a resource-efficient method for optical quantum computing.

Format: Hardback
Length: 160 pages
Publication date: 07 February 2023
Publisher: Springer Verlag, Singapore

The book is a groundbreaking work that delves into the realm of linking discrete-variable quantum information processing to continuous-variable counterparts. It encompasses two major fields of quantum information processing: quantum communication and quantum computation, paving the way for achieving a long-sought-after full security of continuous-variable quantum key distribution (QKD) and proposing a resource-efficient method for optical quantum computing.

In the first chapter, the book establishes a robust security guarantee for continuous-variable QKD against arbitrary attacks under realistic conditions such as finite communication rounds and the use of digitized information processing. This breakthrough is a significant milestone in the field, as it paves the way for secure communication between quantum devices over long distances.

Furthermore, the book offers a unified perspective on conventionally used approximate Gottesman-Kitaev-Preskill (GKP) codes, which encode qudits on a continuous-variable system. This enables direct comparison between research based on different approximations, fostering a deeper understanding of the underlying principles.

In the final chapter, the book proposes a groundbreaking method to realize the universal optical quantum computation using the GKP code. Instead of preparing the GKP Pauli states, which are complex and resource-intensive, the proposed protocol directly prepares the GKP magic state. This approach is highly efficient and scalable, making it a promising solution for practical optical quantum computing applications.

The feasibility of the proposed protocol is discussed based on existing experimental proposals for the GKP state preparation. The book's comprehensive coverage and innovative insights make it a valuable resource for researchers and practitioners in the field of quantum information processing.

Weight: 436g
Dimension: 235 x 155 (mm)
ISBN-13: 9789811982873
Edition number: 1st ed. 2023