Sayandip Dhara

Photon loss is the fundamental issue toward the development of quantum networks. To circumvent loss quantum repeaters were proposed, which need high-performance quantum memories. We present an alternative proposal to mitigate photon loss even at large distances and hence to create a global-scale quantum communication architecture without quantum repeaters. In this proposal, photons are sent directly through space, using a chain of co-moving low-earth orbit satellites.

Abstract Using an atomistic tight-binding model, we investigate the characteristics of a Josephson junction formed by monolayers of MoS2 sandwiched between Pb superconducting electrodes. We derive and apply Green's function–based formulation to compute the Josephson current as well as the local density of states in the junction.

Abstract We present a scheme to use physical Majorana quasizero modes at each junction of a two-dimensional nanowire network to build a logical Majorana zero mode, the location of which is controllable through gate voltages. The wire network is a way to realize a recent proposal to imprint a Kekulé vortex pattern on a honeycomb lattice via gate voltages.