Directed quantum communication

Abstract

We address the question of whether there is a way of characterizing the quantum information transport properties of a medium or material. For this analysis, the special features of quantum information have to be taken into account. We find that quantum communication over an isotropic medium, as opposed to classical information transfer, requires the transmitter to direct the signal toward the receiver. Furthermore, for large classes of media there is a threshold, in the sense that 'sufficiently much' of the signal has to be collected. Therefore, the medium's capacity for quantum communication can be characterized in terms of how the sizes of the transmitter and receiver have to scale with the transmission distance to maintain quantum information transmission. To demonstrate the applicability of this concept, an n-dimensional spin lattice is considered, yielding a sufficient scaling of δ n/3 with the distance δ.

Unruh quantum Otto engine in the presence of a reflecting boundary

“…These avenues open up the possibilities of exploration of fundamental quantum optical aspects like atom-photon lattices [50]. Studies on relativistic quantum phenomena in superconducting circuits [51,52], and secure quantum communication over long-distances [53][54][55][56], show the importance of reflecting boundaries which also play significant physical role in the context of atom-field interaction [57,58], holographic entanglement entropy [59], and quantum entanglement [60][61][62][63].…”