Open-air quantum teleportation performed across a 97km lake
2012 08 15
By Matthew Francis | ARSTechnica
Sending signals through fiber optic cable is reliable and fast, but because of internal absorption and other effects, they will lose photons—which is a problem when the number of photons being sent is small. This is of particular concern in quantum networks, which typically involve a small number of entangled photons. Direct transmission through free space (vacuum or air) experiences less photon loss, but it’s very difficult to align a distant receiver perfectly with the transmitter so that photons arrive at their destination.
Photo illustration of the beacon laser, used to track an entangled photon signal across Qinghai Lake. The statue is Padmasambhava at the Lotus Temple at Gangcha.
A group in China has made significant progress toward solving that problem, via a high accuracy pointing and tracking system. Using this method, Juan Yin and colleagues performed quantum teleportation (copying of a quantum state) using multiple entangled photons through open air between two stations 97 kilometers apart across a lake. Additionally, they demonstrated entanglement between two receivers separated by 101.8km, transmitted by a station on an island roughly halfway between them.
Though the authors do not make this clear in the paper, their method is currently limited to nighttime communication. Nevertheless, their results achieved larger distances for multi-photon teleportation and three-point entanglement than before, and the tracking system used may even enable ground-to-satellite quantum communication—at least if it happens at night.
Quantum communication requires transmitting an arbitrary quantum state between two points, similar to how ordinary communication sends bits (voice or other data) across distances. However, a quantum state is a small amount of information, typically carried by a single photon, so many methods used in ordinary communication are out of the question (including broadcasting).
Read the full article at: arstechnica.com
Padmasambhava - Wikipedia:
Padmasambhava (Means The Lotus-Born), was a sage guru from Oddiyāna who is said to have transmitted Vajrayana Buddhism to Bhutan and Tibet and neighboring countries in the 8th century.
He is considered an emanation of Buddha Amitabha and traditionally even venerated as "a second Buddha".
My father is the intrinsic awareness, Samantabhadra. My mother is the ultimate sphere of reality, Samantabhadri. I belong to the caste of non-duality of the sphere of awareness. My name is the Glorious Lotus-Born. I am from the unborn sphere of all phenomena. I act in the way of the Buddhas of the three times.
Statue of Padmasambhava 123 ft. (37.5 m) high in mist overlooking Rewalsar Lake, Himachal Pradesh, India.
Chinese Physicists Reportedly Break Teleportation Record
Scientists Teleport Light
Teleporting Light: A Breakthrough in Quantum Computing (Video)
DNA molecules can ’teleport’, Nobel Prize winner claims
Researchers Achieve Quantum Teleportation Over 10 Miles of Empty Space
Latest News from our Front Page
Former Chief Security Officer for NewsCorp: N. Koreans Not Behind Sony Hack, Interview Leak
Hemanshu Nigam, a former federal prosecutor and former chief security officer for NewsCorp/Fox studios, says North Korea isn’t behind the Sony Hack.
Nigam gave several bullet points for why the hack was likely an inside job.
Attack code borrowed from a previous attack on Seoul, that’s why it’s in Korean. Private hackers typically borrow malicious code from other hackers.Nations state attacks follow ...
Sony Fires Back at Obama: Actually We Did Call the White House – Several Times
Sony fired back at Obama after the press conference saying they had several conversations with the Obama White House before and after the movie was canceled.
Via The Hollywood Reporter:
After President Obama criticized Sony for its decision to cancel The Interview's release after theater chains decided not to show the film, the studio has issued a statement elaborating on the move.
The Bankster International
Geopolitical analysis, the art of explaining power relationships through the prism of impersonal geography, can be a helpful tool for observers of the Great Game – but it also has its limitations. A case in point is the renewed US-Russia confrontation. Think tanks and policy insiders easily sell the narrative that from the dark days of the Cold War to ...
Another banker dies under suspicious circumstances
52-year-old Belgian Geert Tack – a private banker for ING who managed portfolios for wealthy individuals – was described as ‘impeccable’, ‘sporty’, ‘cared-for’, and ‘successful’ and so as Vermist reports, after disappearing a month ago, the appearance of his body off the coast of Ostend is surrounded by riddles…
Impeccable. Sporty. Cared for. Successful. Just some qualifications that are attributed to ...
NATO increases military presence on Russia’s borders
The Pentagon has confirmed the military buildup along Russia’s borders to ensure long-term “peace and stability” in the region.
Earlier Moscow accused NATO of a sharp increase in air activity and intelligence flights in the border zone.
Replying to RIA Novosti’s query on the increased number of NATO flights around Russia’s borders, a Pentagon representative told the news agency that the military ...
|More News » |