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COMUNICAZIONE QUANTISTICA: FUNZIONA!

Post n°1449 pubblicato il 12 Ottobre 2017 da diegobaratono

DA: "livescience.com"


Quantum Communication Demonstrated in Real-Life City Conditions


For the first time, researchers have demonstrated sending messages in a secure manner using high-dimensional quantum cryptography in realistic city conditions.

Credit: SQO team/University of Ottawa





A quantum-encrypted message containing more than one bit of information in each particle of light was beamed through the air between two buildings in a real-life city for the first time, a demonstration that could simplify quantum communication and make it more viable in the future, according to a recent study.Scientists previously demonstrated in laboratory conditions that a single particle of light, or photon, could encode multiple bits of information. But until now, the experiment had never been demonstrated in a real-world scenario."So far, people have done quantum communication in such a way that they can send either zero or one: one bit of information," said study lead author Ebrahim Karimi, an assistant professor in the Department of Physics at the University of Ottawa. [The 9 Most Massive Numbers In Existence]Advertisement"The problem is that for every single letter, you need to send eight signals — eight zeros or ones. And that's really difficult," Karimi told Live Science. "One signal can get lost and then the entire letter, the entire message, is lost."Encrypting information into the quantum states of particles such as photons in multiple dimensions would therefore considerably simplify the whole process, according to Karimi."Instead of sending many photons, or many electronic signals, I can send you a single pulse, which contains a file of information," he said. "That would be amazing. This is what we call superdense coding."The method tested by Karimi and his team can reduce the number of photons required to transmit a message by 50 percent, according to the study.During the experiment, Karimi and his team successfully sent photons containing two bits of information between two buildings at the University of Ottawa that were located 984 feet (300 meters) apart.According to Karimi, using high-dimensional encoding would also bolster security, making the quantum-communication channel more resistant to "noise" from weather or other external influences."In one-dimensional quantum communication, if the noise reaches to 11 percent [of the signal], the channel is no longer secure," Karimi said. "However, the limit will increase to 19 percent, if you work with four dimensions."The researchers would now like to experiment with sending and receiving high-dimensional quantum-encrypted messages at distances of up to 3.5 miles (5.6 kilometers), in order to be able to use the technique on the city scale. However, there are significant challenges that will need to be overcome."The biggest difficulty is turbulence as the light transmits through the atmosphere," Karimi said. "In our experiment, we are sending a single photon, so that is really difficult. You need to send it to go under a certain angle and use a complicated telescope with sophisticated electronics." [Wacky Physics: The Coolest Little Particles in Nature]The researchers used equipment developed by their colleagues from the University of Naples Federico II, in Italy, that was previously tested in the lab. The device relies on liquid-crystal technology to polarize a passing beam of light to encode the information. For the purposes of the experiment, the researchers had to build rooftop sheds to protect the equipment from weather.The technology could one day be used as part of a global quantum-communication system that would include ground-based networks as well as satellites, the researchers said.Scientists around the world are focusing efforts on quantum cryptography as a way to increase security in the digital world. All messages, transactions and data exchanges between Internet users are encoded via complex mathematical algorithms. However, with recent developments in quantum computing, experts fear such mathematical algorithms will no longer be secure in the future. Quantum computers, once they become a reality, are expected to be capable of performing multiple calculations at the same time. As such, quantum encryption could be the answer to security concerns, experts say, because it is inherently unbreakable."There is no cloning method that means you cannot copy information perfectly," Karimi said. "The second point is that in the quantum world, everything is undefined, everything is blurred. You don't know what is the value unless you measure it."Measuring the particle, however, affects the particle and thus the message it contains, Karimi said. This means a third person eavesdropping on communication between A and B would be caught immediately.Earlier this year, in July, Chinese scientists reported a major milestone in the development of quantum encryption when they successfully transmitted entangled photons from a satellite to a ground station.The study's findings were published online Aug. 24 in the journal Optica.Original article on Live Science.

 
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INDIVIDUATI ALTRI GRAFFITI RISALENTI A 15.000 ANNI FA IN EGITTO

Post n°1448 pubblicato il 05 Ottobre 2017 da diegobaratono

DA: "djedmedu.wordpress.com"


INDIVIDUATI ALTRI GRAFFITI RISALENTI A 15.000 ANNI FA IN UNA VALLE TRA KOM OMBO ED ASSUAN

Wadi Abu Subeira: scoperti graffiti di 15.000 anni
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Source: MoA

Un team egiziano del Ministero delle Antichità ha individuato nuovi graffiti preistorici nello Wadi Abu Subeira, una valle che s’incunea nel deserto tra Kom Ombo e Assuan. Le incisioni rupestri mostrano branchi di animali che vivevano in Egitto alla fine del Paleolitico: ippopotami, tori selvatici, asini, gazzelle, giraffe. In totale diventano così 10 le pareti d’arenaria dello wadi ricoperte di petroglifi che vanno da 15.000 anni fa alla fine del Predinastico. Secondo Nasr Salam, direttore delle Antichità di Assuan e della Nubia, si è arrivati a una datazione grazie al confronto con siti simili come Qurta ed el-Hosh, a nord di Kom Ombo.


 
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LADRI DI IDEE ALTRUI = INDEGNI CIALTRONI IGNORANTI

Post n°1447 pubblicato il 02 Ottobre 2017 da diegobaratono


"I danni prodotti dalla disonestà intellettuale sono di norma assai più gravi di quelli prodotti dal furto di un bene materiale." Roberto Gervaso

"Un leone che imita un leone diventa una scimmia." Victor Hugo

"La maggior parte della gente è altra gente. Le loro idee sono opinioni altrui, la loro vita un'imitazione, le loro passioni una citazione." Oscar Wilde

"L'uomo, qualche volta, è come le scimmie: ha il gusto dell'imitazione." Enzo Biagi

"Preferisco quelli che mi sfruttano a quelli che mi imitano. I primi hanno qualcosa da insegnarmi."                 Georges Braque



 
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SCOPERTA UNA TESTA IN GESSO DI AKHENATON A TEL EL-AMARNA

Post n°1446 pubblicato il 02 Ottobre 2017 da diegobaratono

DA: "egitalloyd.blogspot.it"

New Discovery, Minya: Gypsum Head of King Akhenaten Statue Unearthed in Egypt's Minya

Posted: 01 Oct 2017 12:54 AM PDT

A British-Egyptian archaeological mission from Cambridge University has discovered a gypsum head from a statue of King Akhenaton (around 1300 BC) during excavation work in Tel El-Amarna in Egypt’s Minya governorate. Written By/ Nevine El-Aref.

The head – which is 9cm tall, 13.5 cm long and 8 cm wide – was unearthed during excavation work in the first hall of the Great Atun Temple in Tel El-Amarna, secretary-general of the Supreme Council of Antiquities Mostafa Waziri told Ahram Online.

Waziri says the discovery is important because it sheds more light on the city that was Egypt's capital during the reign of King Akhenaten, the 10th pharaoh of the 18th dynasty whose reign was among the most controversial in ancient Egyptian history.

The Cambridge University mission is led by archaeologist Barry Kemp, who started excavations in Tel El-Amarna in 1977 at several sites including the grand Aten Temple, the Al-Ahgar village, the northern palace, and the Re and Banehsi houses, according to director-general of Antiquities in Middle Egypt Gamal El-Semestawi.

The mission has also carried out restoration works at the Small Atun Temple and the northern palace.

Tel El-Amarna, which lies around 12 kilometers to the southwest of Minya city, holds the ruins of the city constructed by King Akhenaten and his wife Queen Nefertiti to be the home of the cult of the sun god Aten.  The ruins of this great city include magnificent temples, palaces and tombs.

 
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COSI', TANTO PER DIRE II

Post n°1445 pubblicato il 11 Settembre 2017 da diegobaratono

I grandi spiriti hanno sempre trovato la violenta opposizione delle menti mediocri. La mente mediocre è incapace di comprendere l’uomo che rifiuta d’inchinarsi ciecamente ai pregiudizi convenzionali e sceglie, invece, di esprimere le proprie opinioni con coraggio e onestà.

Albert Einstein


MEDITATE GENTE, MEDITATE II

 
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