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".

Padmasambhava said:

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.






Related Articles
Padmasambhava
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

NATO Exercise in Ukraine Coincided with MH-17 Shoot-down
2014 07 24
Rapid Trident was omitted from the flurry of coverage on the shoot-down MH-17. From the U.S. Army in Europe website: Rapid Trident supports interoperability among Ukraine, the United States, NATO and Partnership for Peace member nations. The exercise helps prepare participants to operate successfully in a joint, multinational, integrated environment with host-nation support from civil and governmental agencies. ...
Warning of ’imminent’ terror attack in Norway
2014 07 24
Norwegians were warned Thursday of the concrete possibility of a terror attack occurring in that country at the hands of people with connections to an extremist group in Syria. A press conference was called in Oslo, Norway on Thursday where an announcement was made of a "possible concrete threat" to national security in that country from terrorists related to an extremist ...
Judge says government can access everything in a Gmail account
2014 07 24
All your emails are belong to us. At least that’s what the latest court order from a judge in New York says. The warrant, granted on June 11, states that the government can access all the content and files contained in a Gmail account. Yes, this is a significant blow to privacy. The subject of this specific search relates to a money laundering ...
Scotland Yard Spied on Grieving Families: secret surveillance after police victim shot seven times in head ’by mistake’
2014 07 24
More terror from the ’anti-terror’ brigade. Undercover police gathered evidence on 18 grieving families By Rob Evans and Vikram Dodd | The Guardian Undercover police officers secretly gathered intelligence over two decades on 18 families fighting to get justice from the police, it was revealed on Thursday. The intelligence covering high-profile campaigns was collected between the mid-1980s and 2005, and affected grieving families ...
Air Algerie AH5017 with 116 onboard goes missing for hours, found crashed in Mali
2014 07 24
An Air Algerie flight carrying 110 passengers and six crew members has reportedly crashed in Mali after having disappeared from radar early on Thursday morning between Burkina Faso and Algeria. A French Ministry of Defense official told Fox News that the two French fighter jets located the wreckage of the plane, which had crashed in Mali. An airport official additionally confirmed ...
More News »