Interstellar communication. I. Maximized data rate for lightweight space-probes

Michael Hippke
(Submitted on 12 Jun 2017)

Recent technological advances could make interstellar travel possible, using ultra-lightweight sails pushed by lasers or solar photon pressure, at speeds of a few percent the speed of light. Obtaining remote observational data from such probes is not trivial because of their minimal instrumentation (gram scale) and large distances (pc). We derive the optimal communication scheme to maximize the data rate between a remote probe and home-base. The framework includes models for the loss of photons from diffraction, technological limitations, interstellar extinction, and atmospheric transmission. Major noise sources are atmospheric, zodiacal, stellar and instrumental. We examine the maximum capacity using the “Holevo bound” which gives an upper limit to the amount of information (bits) that can be encoded through a quantum state (photons), which is a few bits per photon for optimistic signal and noise levels. This allows for data rates of order bits per second per Watt from a transmitter of size 1m at a distance of α Centauri (1.3 pc) to an earth-based large receiving telescope (E-ELT, 39 m). The optimal wavelength for this distance is 300 nm (space-based receiver) to 400 nm (earth-based) and increases with distance, due to extinction, to a maximum of ≈3 μm to the center of the galaxy at 8 kpc.

Comments:    10 pages, 11 figures, comments welcome
Subjects:    Instrumentation and Methods for Astrophysics (astro-ph.IM); Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:    arXiv:1706.03795 [astro-ph.IM] (or arXiv:1706.03795v1 [astro-ph.IM] for this version)
Submission history
From: Michael Hippke
[v1] Mon, 12 Jun 2017 18:15:28 GMT (2581kb,D)
https://arxiv.org/abs/1706.03795