Open-air quantum teleportation performed across a 97km lake
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
Facebook completes first drone flight above UK, Mark Zuckerberg confirms
Solar powered drones which provide internet access to rural and remote areas have been trialled in UK for first time by Facebook.
They â€śhave a wingspan greater than a Boeing 737 but will weigh less than a carâ€ť, according to the social network's chief Mark Zuckerberg.
The drones, developed by Somerset-based company Ascenta which Facebook bought last March, will beam down laser-guided ...
300 Young English Girls (and a few Boys) Groomed and Assaulted by Oxfordshire "Gangs," Report Finds
Editor's note: This story is a few days old now but the echoes of Rotherham just keeps coming. A few weeks ago there was Halifax, now Britain proudly can add Oxfordshire to their line up of diversity success stories.
Below is the story from the telegraph:
Serious case review finds failings by police and social services as it identifies hundreds of victims
British POW describes the horror of the bombing of Dresden
Partial Transcript of Interview with Victor Gregg, WW2 British solder and POW:
Interviewer: "Tell us how it was that you were in Dresden at that time."
Victor Gregg: "It was evil....thousands of firebombs dropping all over the place, heat, fire, people screaming, people burning, people alight. After about half an hour it started developing into something that was really bad....It was ...
Rape of 285,000 German Women at the End of WWII Trigger Damage Control by Mainstream Media
Is Exposing Allied War Crimes an honorable act? No, itâ€™s slandering heroes according to Daily Mail
A recent article from the Daily Mail that pretends to look at the post WWII crimes and rapes of the Allies against the German people is actually damage control. Itâ€™s really an attempt to divert away from the true horrors that was visited upon Germany ...
Minister of Migration attacked by asylum seeker with fire extinguisher
Swedenâ€™s Minister of Justice & Migration also known as Morgan â€śonly 1%â€ť Johansson, has been attacked with a fire extinguisher when he visited an asylum home for future Swedes.
Regional newspaper, Kristiandstadsbladet reported that a man who had been living at the home for a couple of weeks grabbed a fire extinguisher and sprayed foam all over the minister who didnâ€™t ...
|More News » |