An Architectural Perspective on Digital Quantum Switching

I-Ming Tsai, Sy‐Yen Kuo

This chapter reviews some of the most important techniques for carrying quantum bits through a quantum information network. In order to avoid a fully meshed architecture, switching units are required to build a realistic network. Traditionally, there are two paradigms in doing digital switching: circuit switching and packet switching. The classical telephone network is a circuit switching network, while the Internet is a packet switching network. Although significant differences exist between circuit switching and packet switching, the main function of each node is to move data from an input port to an output port. In the field of classical digital switching, various techniques have been designed to perform this function. Compared with classical digital switching technology, quantum information science is a relatively new field of study. Modern packet switching networks take packets that share the same transmission line as input and each packet is transferred to its destination individually.

Suryansh Upadhyay, Mahabubul Alam, Swaroop Ghosh

Suryansh Upadhyay, Mahabubul Alam, Swaroop Ghosh

I.-M. Tsai, Sy‐Yen Kuo

Presents a switching architecture such that digital data can be switched in the quantum domain. The proposed mechanism supports unicasting as well as multicasting, and is strict-sense nonblocking. In addition, with appropriate interface conversion, this architecture can also be used to switch classical information. This results in a quantum switch that can be used to build classical and quantum information networks. To present this idea, we define the connection digraph which can be used to describe the behavior of a switch at a given time, then we show how a connection digraph can be implemented using elementary quantum gates. Compared with a traditional space or time domain switch, the proposed switching mechanism is much more scalable. Assuming an n/spl times/n quantum switch, the space consumption grows linearly, i.e., O(n), while the time complexity is O(1) for unicasting, and O(log/sub 2/n) for multicasting. Based on these advantages, a high-throughput switching device can be built simply by increasing the number of I/O ports.

Andreea-Alina Cornea, Alexandru Marius Obretin

Living in the world managed by technology involves taking into consideration all security aspects which may help, protect, and maintain digital environment healthy. As the technology evolves, the importance of upgrading is emphasized by customer perception and satisfaction and justifies the decision to switch from obsolete alternatives, as monolithic applications which can be found in most public system architectures developed during 2000s, to microservices and increased security ecosystems, as an indisputable requirement. Even so, current times are defined by innovation and quantum computers future usage seems to define a totally new era of security. This paper represents an overview of how this future perspective may affect public system applications and aims to provide a possible approach for integrating mathematical constructs into the security layer to increase protection for the modern software architectural style represented by microservices and which has become the favourite development alternative of the last years.

Fatma Hamzaoui, Roselyne Chotin-Avot, Mohsen Machhout +2 more