If that is the case, it might be that there is a "Great Filter" which tends to knock these civilizations back into their stone age, or kill them outright. The rough idea is that the galaxy seeming insanely quiet could potentially imply that it's rare for life to reach a level which we can easily detect space-faring, multi-planetary, capable of astro-engineering, etc. I assume it's a reference to the Great Filter: The short answer is that we don’t even come near to monitoring all “propagators” let alone all possible encoding schemes for these, for SETI.
That is also a technical problem of some magnitude if the distances are light years. Further, for using this for anything, we’ll need to store the local particle for the duration of flight of the emitted one. The coherence requirement basically means that the longer a particle is exposed to the normal world, the bigger the chances of some kind of stray interaction with other particles or forces, that will break entanglement. Spin, charge, neutrino flavor phases, etc.Īs for entangled pairs, which I presume you imply by quantum communication, it really isn’t a hidden dimension with magical properties of superluminal communication, it just implies that two particles can have shared/correlated quantum states (assuming you can keep coherence). All of them have unique states that can be used to encode information. We primarily rely on electromagnetism but neutrinos, gravitational waves, charged or neutral particle beams etc. Quantum or not, any type of propagating and interacting particle or force can be used for communication. Maybe it's not worth even attempting until the receiving civilization would be able to decode more than just a few bytes from a signal that could be affordably transmitted from a single star. Even if detected, there would be no obvious modulation, and it would look a lot like a white noise emitter. Too low power, too high frequency, data encodings based on mathematics not even invented yet. Hundreds of thousands of carriers are used in parallel.īy the early 21st century it's unlikely our 1920s engineer can even detect radio signals from devices like a modern cellphone even if they had it in the lab with them - and they blatantly transmit high power beacons in the open to find other devices. Frequencies climb into the thousands of megahertz. Then round after round of increasingly complex digital encodings with error correction and encryption, with larger and larger symbol rates and symbol set sizes. Assuming they manage to lock on to the frequency-modulated edge of a suppressed carrier in the 1970s, things start to switch to a multitonal digital encoding.
By 1950, a lot of things seem to become undecodable (FM), and shortly after that a lot of carriers seem to simply disappear. Imagine someone with the latest radio technology from 1920 trying to monitor our civilization's progress. Over the last century, our own radio technologies have undergone a continual progression in efficiency and data rate. One option that cannot be ruled out, and probably can never be totally ruled out, is that they are in fact out there, and are in fact transmitting quite openly, and we're simply too technologically limited to be able to detect them.
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