Time‐Multiplexed Networks for Quantum Optics
Sonja Barkhofen, Linda Sansoni, Christine Silberhorn · 2016
This chapter presents the basic idea of multiplexing in the spatial and time domains. It looks into time multiplexing as an efficient resource to perform photon-number-resolved detection. The chapter introduces the discrete-time quantum walk (DTQW). In optics, there are essentially two ways of creating such a quantum system: the first is to exploit a discrete high-dimensional degree of freedom of the system itself. The second is to discretize a continuous degree of freedom external to the system. Many effects and applications in the field of quantum information rely on large networks. They can be high dimensional and very complex, on the one hand. while, on the other hand, a precise control and a high flexibility in tuning the network parameters are essential. Thus, one main experimental challenge in quantum information is the implementation of quantum networks of macroscopic size without losing the control of the microscopic features of the single nodes and edges.