Benchmarking information carriers

Hippke, Michael

doi:10.1016/j.actaastro.2018.05.038

Cited by 15 publications

(8 citation statements)

References 101 publications

(111 reference statements)

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“…We expect that our results might be useful in the multimessenger astrophysics, in particular, in the case of ultrahigh energy neutrinos as messengers. Finally, we note that persistent spin-flavor coherence may be important for neutrino quantum information protocols, for example, such as neutrino-based interstellar communication [60], in the foreseeable future.…”

Section: Discussionmentioning

confidence: 98%

Coherence and mixedness of neutrino oscillations in a magnetic field

et al. 2021

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The radical departure from classical physics implies quantum coherence, i.e., coherent superposition of eigenstates of Hermitian operators. In resource theory, quantum coherence is a resource for quantum operations. Typically the stochastic phenomenon induces decoherence effects. However, in the present work, we prove that nonunitary evolution leads to the generation of quantum coherence in some cases. Specifically, we consider the neutrino propagation in the dissipative environment, namely in a magnetic field with a stochastic component, and focus on neutrino flavour, spin and spin-flavour oscillations. We present exact analytical results for quantum coherence in neutrino oscillations quantified in terms of the relative entropy. Starting from an initial zero coherence state, we observe persistent oscillations of coherence during the dissipative evolution of an ultra-high energy neutrino in a random interstellar magnetic field. We found that after dissipative evolution, the initial spin-polarized state entirely “thermalizes”, and in the final steady state, the spin-up/down states have the same probabilities. On the other hand, neutrino flavour states also “thermalize”, but the populations of two flavour states do not equate to each other. The initial flavour still dominates in the final steady state.

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Section: Discussionmentioning

confidence: 98%

Coherence and mixedness of neutrino oscillations in a magnetic field

et al. 2021

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“…The usage of radio as the normative manner of communication made sense in the early days of SETI, but is hardly supported nowadays when even human civilization relies progressively less on radio communication than it was the case a few decades back. While there might still be some advantages in interstellar radio (Hippke 2018), today we clearly see that diverse types of technosignatures require different effective definitions of the "communication window", hence different effective values of L.…”

Section: The Classical Treatmentmentioning

confidence: 95%

Longevity is the key factor in the search for technosignatures

Balbi,

Ćirković

2021

Preprint

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It is well-known that the chances of success of SETI depend on the longevity of technological civilizations or, more broadly, on the duration of the signs of their existence, or technosignatures. Here, we re-examine this general tenet in more detail, and we show that its broader implications were not given the proper significance. In particular, an often overlooked aspect is that the duration of a technosignature is in principle almost entirely separable from the age of the civilization that produces it. We propose a classification scheme of technosignatures based on their duration and, using Monte Carlo simulations, we show that, given an initial generic distribution of Galactic technosignatures, only the ones with the longest duration are likely to be detected. This tells us, among other things, that looking for a large number of shortlived technosignatures is a weaker observational strategy than focusing the search on a few long-lived ones. It also suggests to abandon any anthropocentric bias in approaching the question of extraterrestrial intelligence. We finally give some ideas of possible pathways that can lead to the establishment of long-lived technosignatures.

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“…In the radio, choosing photons of higher energies leads to difficulties as the information that survives the 1/r 2 law per erg gets lower, and moving to lower energies introduces the problem of background photons from electrons in the interstellar medium. The balance of these two issues historically led to the development of the "Water Hole" (Oliver 1979a) as an optimal frequency in which to transmit and search, but the case is somewhat overstated: more recent work has found benefits to using a wide range of wavelengths, especially optical or infrared laser light (see Hippke (2018) for a discussion of the merits of other frequencies and carriers. )…”

Section: Communicative Signalsmentioning

confidence: 99%

Strategies and Advice for the Search for Extraterrestrial Intelligence

Wright

2021

Preprint

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As a guide for astronomers new to the field of technosignature search (i.e. SETI), I present an overview of some of its observational and theoretical approaches.I review some of the various observational search strategies for SETI, focusing not on the variety of technosignatures that have been proposed or which are most likely to be found, but on the underlying philosophies that motivate searches for them.I cover passive versus active searches, ambiguous versus dispositive kinds of technosignatures, commensal or archival searches versus dedicated ones, communicative signals versus "artifacts", "active" versus derelict technologies, searches for beacons versus eavesdropping, and model-based versus anomaly-based searches. I also attempt to roughly map the landscape of technosignatures by kind and the scale over which they appear.I also discuss the importance of setting upper limits in SETI, and offer a heuristic for how to do so in a generic SETI search. I mention and attempt to dispel several misconceptions about the field.I conclude with some personal observations and recommendations for how to practice SETI, including how to choose good theory projects, how to work with experts and skeptics to improve one's search, and how to plan for success.

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Benchmarking information carriers

Cited by 15 publications

References 101 publications

Coherence and mixedness of neutrino oscillations in a magnetic field

Coherence and mixedness of neutrino oscillations in a magnetic field

Longevity is the key factor in the search for technosignatures

Strategies and Advice for the Search for Extraterrestrial Intelligence

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