CommunityNews

CommunityNews

Undetectable quantum computation and communication for alien civilizations

Perhaps they are everywhere? Undetectable distributed quantum computation and communication for alien civilizations can be established using thermal light from stars.
We show that free-space diffraction of photons distributes highly useful
entanglement: the receivers of the propagated modes can do a distributed
quantum computation using only linear optics and photon counting. The
distributed computation requires classical communication between receivers,
however, similar to standard measurement-based computation, that communication
is of purely random outcomes and so can be indistinguishable from noise. The
speculation in the title arises from the further observation that the natural
way for a circumspect civilization to hide their photonic entanglement
distribution is to use the thermal light already being emitted from the various
stars they visit. This requires them knowing the number of photons in the modes
they have chosen to use, and as such they would need to perform a quantum
non-demolition measurement of photon number. Because the thermal light they are
measuring is diagonal in the number basis even this process can be rendered in
principle indiscernible to those of us excluded from the conversation.

Read in full here:

This thread was posted by one of our members via one of our news source trackers.

Where Next?

Popular Other Fields topics Top

First poster: bot
Scaling up to a large number of qubits with high-precision control is essential in the demonstrations of quan- tum computational advantag...
New
CommunityNews
Major Quantum Computing Advance Made Obsolete by Teenager | Quanta Magazine. 18-year-old Ewin Tang has proven that classical computers c...
New
First poster: bot
From ‘chandeliers’ to entangled qubits, here’s what happens inside a quantum computer | Aeon Videos. From ‘chandeliers’ to entangled qub...
New
aas1992
I’m working with very large matrices for QUBO problems, and I’m currently using QBsolv from D-Wave. However, given that Qbsolv is being d...
New
aas1992
"If a matrix Q of a QUBO problem corresponds perfectly to an original optimization problem P, can QBsolv from D-wave return an infeasible...
New
First poster: bot
Chaos: The Real Problem with Quantum Mechanics. Science News, Physics, Science, Philosophy, Philosophy of Science
New
nauvandimas20
Hello! I want ask how the params.npy variable were obtained? It would be great if you provide the codes for my better understanding
New
evancamilleristl
If I try to transform a PUBO x_0 x_1 x_2 to QUBO, certain documentation says that I need to add the constraint 6 x_3 + 2 x_0 x_1 - 4 x...
New
zadnarock
Say I have multiple backends, I need a score to determine how well a backend is suitable for that particular circuit, I have it’s noise m...
New
Liparttiti
Long story short . At 13 an asteroid flew by overhead . Wafted . Defied gravity . Three decades later I’m developing physics engines to s...
New

Other popular topics Top

malloryerik
Any thoughts on Svelte? Svelte is a radical new approach to building user interfaces. Whereas traditional frameworks like React and Vue...
New
PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
AstonJ
SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...
New
DevotionGeo
I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...
New
AstonJ
We have a thread about the keyboards we have, but what about nice keyboards we come across that we want? If you have seen any that look n...
New
PragmaticBookshelf
Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...
New
PragmaticBookshelf
Learn different ways of writing concurrent code in Elixir and increase your application's performance, without sacrificing scalability or...
New
Margaret
Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.
1143 25883 760
New
AstonJ
If you get Can't find emacs in your PATH when trying to install Doom Emacs on your Mac you… just… need to install Emacs first! :lol: bre...
New
AstonJ
If you’re getting errors like this: psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...
New