between themfrom the University of Edinburgh, and Jaime Calderon-Figueroa, recently published in the famous magazine Physical examination d An article that will undoubtedly attract the attention of the founding members of the ideas behind the program, for example . The publication is available for free here And it raises the question of whether a technologically advanced civilization could not use a technology from quantum information theory, such as teleportation in a quantum state, to communicate with its other members. , .
The question is raised whether the quantum computing revolution will lead to some of the dreams of its pioneers, a technologically advanced civilization could only use.Interacting precisely with each other accounts for the EPR effect behind the concept of quantum teleportation. We doubt we can pass much more information through Quantum teleportation is only with waves In the classical world, moreover, we want to develop a kind of Quantum using beams .
Quantum teleportation for dummies
Let’s have a few reminders about quantum teleportation that Futura already explained on this topic.
When it all started in 1993Charles Bennett and his colleagues (including Gilles Brassard and Claude Crepeau) are working here published an article in which they proposed a Experimental to allow teleportation of quantum states. Austrian after four years published An article announced that, along with other researchers, he was able to implement Bennett’s ideas for quantum teleportation.
The performance and especially the name of the event certainly immediately evokes the enthusiasm of fans of the series. Star Trek, there hopes to make one of science fiction’s biggest dreams come true. Unfortunately, with this quantum phenomenon it is unlikely that one day the equivalent of Mr. Spock and Captain Kirk will disappear from the face of the earth.or a To teleport inside the Enterprise.
The reason is that in experiments performed by physicists, only one quantum state is teleported, so information, not matter. Furthermore, the systemPrimary bearing data is destroyed. In the best case, a Complete, includes memory and state of consciousness, letter one Star Trek Eventually the Enterprise could be rebuilt, but the original would be well and truly dead.
Quantum teleportation itself is based on the theoretically discovered phenomenon of quantum entanglement.And In the 1930s. This phenomenon is at the heart of the famous EPR paradox and the existence of which was verified in 1982. and his colleagues.
Produced for capsule display What happened to the invention of the past?, broadcast on Canal Savoir. This citation traces the evolution of an invention selected among the 10 Inventions of 1993 by Gilles Brassard (University of Montreal) and Claude Crepeau (McGill University). Quebec Science : Quantum teleportation. © Quebec Research Fund
When two particles are quantum entangled, certain physical quantities are assigned to one of the two particles when they are measured in the other. The effect seems to be instantaneous and if on Earth Alice measures in thousands of the particles stuck to Bob.Bob will receive measurement results on his own particles that depend on Alice’s, as if a signal had traveled much faster than light from Alice to Bob. .
However, although transluminal correlation exists between two particles, it is impossible to build a phone that can communicate faster than light in this way.
We can still use a quantum state carrying lots of information that will be transferred to Alice’s particle, by performing certain measurements, Alice will then teleport the quantum state and all the information to Bob’s particle.
But without knowing what the results of Alice’s own measurements were, Bob could not extract the information encoded in his particle under certain measurements.
If Alice, for example, uses a series of pairsTo transmit a quantum state of the entangled laser, it will for example send the results of Bob’s measurements by radio waves. Therefore, we cannot communicate faster than light However, it is suspected that the amount of information that can be transferred by working with a connected quantum computer via quantum teleportation will be much greater.
Now let’s have a few reminders about the program and its history.
Seti on the tail of the laser
The motivation for Search for Extra-Terrestrial Intelligence, We tried to find out if XX had a chance to survivee and XXIe Centuries concretely its primary purpose was to detect signals of an extraterrestrial civilization And if possible, determine if these signals have a message for our destination… and to answer them.When he helped develop the program
In the last century the Cold War was in full swing and the proliferation of nuclear weapons was not well seen. todayNuclear war has moved away. However, its consequences And the scarcity of natural resources, which, with our overpopulated and irrational world, has not entirely ruled it out. The discovery of one or more ET civilizations can give us confidence in a future that seems very dark, if we believe the famous .
However, the best way to detect and communicate with technologically advanced ET civilizations may not be through the use of radio telescopes. The way would be in the form of projects designed to try to detect emissions from ET civilizationsWhether they are byproducts of interstellar solar sail propulsion techniques, such as Project , or actual attempts at interstellar communication. The idea that extraterrestrials might prefer to communicate interplanetary, or even interstellar distances, using lasers is outdated. It has already been formulated In 1961, one year after Townes invented the laser, and two years after It proposed the basic concept of the program.
Some pictures of laserset. To get a fairly accurate French translation, click on the white rectangle at the bottom right. English subtitles will then appear. Then click on the nut to the right of the rectangle, then “Subtitle” and finally “Auto Translate”. Select “French”. © That is the institute
We are now almost ready to understand the work of Arjun Berera and Jaime Calderón-Figueroa.
. Initially, they use a whose photons were trapped with a nonlinear optics device and sent into space to test the idea of a future planetary quantum internet.
One advantage of sending photons into space is that they travel fasterEarthly to enter the void of space. However, it appears that, as in the case of computers, the problem of decoherence must be solved by the quantum internet. Indeed, the quantum state carried by photons is fragile and can be decayed by the medium they pass through, limiting the range of information transfer.
The two astrophysicists therefore asked themselves how many intercepted photons were sent from Earth, say, could reliably teleport information. More generally, what would be the probability at greater interstellar distances .
They are thus taken into accountlight by and disturbances from dust, plasma particles and to its effect They are photons or .
Remarkably, there will be no real problem and works with photons in this caseWe can reach distances of millions of light years, so directly a quantum internet that could be intergalactic.
Specifically, to demonstrate the existence of transfer of information via quantum teleportation of ET sources, it is necessary to simultaneously find a double signal, for example a visible laser beam as one wishes to detect its members.Coupled with a radio signal that would provide a means of deciphering the quantum state transferred by laser photons.