Satellite quantum repeaters for a quantum Internet

Abstract

This work presents a satellite alternative to quantum repeaters based on the terrestrial laid of optical fiber, where the latter have the following disadvantages: a propagation speed (v) equal to 2/3 of the speed of light (c), losses and an attenuation in the material that requires the installation of a repeater every 50 km, while satellite repeaters can cover greater distances at a speed v = c, with less attenuation and losses than in the case of optical fiber except for relative environmental aspects to the ground-sky link, that is, clouds that can disrupt the distribution of entangled photons. Two configurations are presented, the first one of a satellite and the second one of two satellites in the event that both points on the ground cannot access the same satellite. Finally, a series of implementations for evaluating the performance and robustness of both configurations are implemented on a 5 qubits IBM Q processor.

On the spectral nature of entanglement

“…Finally, the nexus between QFT, CNOT gate, entanglement, and teleportation, will bring us even closer to a more detailed understanding of the tools used in quantum communications known as quantum memories [47][48][49] and quantum repeaters [50,51], which will play a key role in the development of the future quantum Internet [39][40][41][42][43][44].…”

Fourier’s Quantum Information Processing

“…Success of the latter has an obvious impact on a new version of the internet, named quantum internet [45][46][47][48][49][50][51][52][53][54][55][56][57][58]. In fact, a spectral analysis of this new network is of fundamental importance to increase its performance, given that the information exchange that will take place in quantum internet is based on signal traffic and processing, as well as on the use of entangled pairs in the transmitter, receiver, terrestrial quantum repeaters [59][60][61][62][63], and satellite quantum repeaters [64,65].…”

Fourier Behind Entanglement: A Spectral Approach to the Quantum Internet

“…Moreover, the conclusions drawn from this study will be fundamental in alternative areas of quantum communications outside of the quantum Internet, such as space quantum communications or free space optical communications. [34][35][36][37][38][39][40][41] The outline of the paper is as follows: In Section 2, the bridge between entanglement and QFT is introduced; Section 3 describes the main three applications of entanglement present in the quantum Internet expressed via QFT, while in Section 4 all applications described in the previous sections are implemented on a 5-qubit IBM Q platform. [31] Finally, the conclusions are presented in Section 5.…”

“…In this section, we will implement three of the most important tools of the quantum Internet [16][17][18][19][20][21][22][23][24][25][26][27][28][29] in terms of the QFT. They are quantum teleportation, [50][51][52] quantum secret sharing, [47] and terrestrial [53][54][55][56][57] quantum repeaters, as well as space [39][40][41]58] quantum repeaters. As we will see, these protocols and those based on entanglement that are not mentioned in this study can be exclusively implemented based on the QFT, thus exposing the spectral facet of the quantum Internet.…”