quantum networks


 Scientists at the University of Science and Technology in Hefei, China have successfully beamed ‘entangled’ particles of light from a satellite with a specialized quantum optical payload to ground stations, paving the way for a future global quantum internet.
 The experiment relied on the world’s first quantum-enabled spacecraft - a Chinese satellite called Micius. As it travelled over China, the satellite created pairs of photons with properties that were linked through quantum entanglement. It then beamed these simultaneously to three ground stations - travelling up to 2,000 km (1,240 miles) before reaching their destination.
Researchers believe that by linking particles in this way, encrypted information could be sent all around the world across a quantum network with no danger of anybody decrypting and reading the content, as can be done currently on the existing internet.
 “It’s an important step towards a worldwide quantum network,“ said Anton Zeilinger at the Vienna Centre for Quantum Science. "If you envisage a quantum network, the question is how to cover large distances and that cannot be done with glass fibres on the ground. You have to go into space, because in glass fibres you lose the signal. It’s very important to show that it works with satellites, so I’m very excited by this.”

Read more about this fascinating story at: https://www.theguardian.com/science/2017/jun/15/scientists-make-quantum-leap-towards-a-secure-new-kind-of-internet

Image: Timelapse of laser-guided satellite-to-earth link of Micius to an observatory at Ali

Shortcut to satellite-based quantum encryption network

In a new study, researchers demonstrate ground-based measurements of quantum states sent by a laser aboard a satellite 38,000 kilometers above Earth. This is the first time that quantum states have been measured so carefully from so far away.

“We were quite surprised by how well the quantum states survived traveling through the atmospheric turbulence to a ground station,” said Christoph Marquardt from the Max Planck Institute for the Science of Light, Germany. “The paper demonstrates that technology on satellites, already space-proof against severe environmental tests, can be used to achieve quantum-limited measurements, thus making a satellite quantum communication network possible. This greatly cuts down on development time, meaning it could be possible to have such a system as soon as five years from now.”

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Chinese scientists have built the first quantum satellite network
China’s quantum satellite has produced its first successful result. In a paper published today in Science, researchers from the Chinese Academy of Sciences announced the satellite had successfully distributed entangled photons between three different terrestrial base stations, separated by as much as 1,200 kilometers on the ground. The result is the longest entanglement ever demonstrated, and the first that spanned between the Earth and space. Read more

franzferdinand2  asked:

Alright, another pitch. Let's say it's 1992 and DC is letting you decide how the Death of Superman is going to go. Assume that you're allowed to write whatever you want, and also have full editorial control if you want multiple books about it. How do you do it and how do you bring him back (after how long)?

Hoo, okay. My personal favorite take on Death of Superman is in the JLU cartoon, in the two-parter “Hereafter.” Barring just straight redoing that, and bearing in mind that I haven’t reread it in twenty years, here is roughly what I would do.

We establish up front the big missed opportunity, that Lex always carries on about how he could be a hero so much better than Superman if only Superman weren’t around, and how Superman actually believes that this is possible - that Luthor could be a far more inspirational figure than Superman, and effect far more lasting change through technological advancement, if only Luthor was able to overcome his demons (jealously, greed, pride.)

These two factors come to a head when Doomsday shows up. Now, Doomsday is kind of a boring villain, and thankfully with the recent DOOMED crossover they’ve started to shift him away from a big bruiser to something that plays more to him adapting to every fight, like the Borg. I’d introduce this a bit earlier. Superman throws Doomsday into space? Doomsday sprouts wings halfway there and flies back. Doomsday evolves fireproof chitin, warding off heat vision. The fight shifts back and forth and back and forth. Cleverness is failing Superman. So is inspiring others to act, because anyone who threatens Doomsday to try and protect Superman winds up being badly hurt if not killed, forcing Superman to order everyone to let him handle it on his own.

Doomsday, in other words, wins because the Superman storytelling victory paradigm finally fails Superman.

Superman manages to get Doomsday on the ropes long enough for Luthor to vaporize it with a death ray. Superman bids Lois a farewell and he passes on.

At this point, the line is split in half, with the various Superman replacements coming into play - but with Luthor counted amongst them, replacing Cyborg Superman and the Eradicator (which are both yet another not quite Superman that we frankly do not need.) Superman’s last will and testament (which is a whole thing of its own, reverberating through the DC line for a month or two, because of course Superman remembered to put everyone in his will) included a personal letter to Lex Luthor asking him to be a better man, and Luthor actually tries to be so, and there is a small kernel of his success, him helping to coordinate the other heroes of Metropolis and working on his miracle cure for several types of cancer (currently tends to kill the patient unless you’re superhuman, but he’s sworn to fix that.)

Meanwhile, we learn up front that Superman is NOT dead, costing DC millions of dollars in spectator money but hopefully forestalling the spectator bubble bursting and essentially wrecking the direct market. Honestly, it’s better if we get this out of the way up front rather than lie to readers for months on end, right? Didn’t we all prefer how they handled Dick Grayson as Batman, him thinking Bruce was dead but us knowing Bruce Wayne was still alive?

Instead, he was rescued by the Legion of Super-Heroes, who used 31st century medicine to revitalize him. However, the medicine requires him to stay in the 30th century, because his body is riddled with Doomsday’s micro-organism attackers, which require an up-to-the-minute nano-bot army in his system to adapt to Doomsday faster than it, in turn, can adapt to it. These nanites need to be hooked into the computational power of the 30th century’s quantum computer wireless network. Without them, Superman will die within an hour.

“I don’t accept that,” he tells Brainiac Five. “There’s got to be some other way.” But for a while, we get Superman adventuring in the 30th century, establishing or re-establishing some ties, and hinting at what happened after history said he was “killed.”

(Side note: perhaps it’s possible to restore Superboy’s place in Legion history at the same time, by having the medicine also regress Superman physically to a teenager, and have the act of refusing to let him die be the first action of the someday-legendary Legion of Super-Heroes. But I digress…)

In the present, Lois and Jimmy uncover startling evidence that suggests that Luthor lured Doomsday to Metropolis, planning to let it kill Superman and then killing it himself. Lois is forced to choose between a possible greater good and her duty to the truth. Obviously, because she’s Lois Lane, she chooses the truth. When the allegations break, there is a split down the middle of the freshly formed Team Metropolis, with Steel and Supergirl firmly on Lois Lane’s side and the younger, more uncertain Superboy on Luthor’s. Luthor, being Luthor, views Steel and Supergirl standing on a matter of principle as a personal betrayal, and that’s when he starts to backslide.

Luthor winds up activating one of his many contingency plans to eliminate Supergirl and Steel, causing brutal infighting amongst Superman’s allies at the worst possible time, because now Doomsday has returned and there may be no stopping it.

… and when Superman learns that this is the day that Metropolis was destroyed utterly with no survivors, vaporized by Luthor’s black hole bomb in a desperate attempt to stop Doomsday, He refuses to stay in the future one second longer. He insists on going back, and after having fought half the Legion to a standstill, the other half figures out that they just can’t talk him out of it.

Superman returns. He has one hour to stop Luthor’s black hole bomb, figure out a way to stop an even more dangerous Doomsday, and if he’s got time, save his own life.

Luthor, facing the realization that he didn’t kill Doomsday after all - that he made a mistake, which is the one thing Luthor cannot fathom himself doing - suffers a nervous breakdown and is barely any help. So while Superman, Supergirl, Superboy and Steel keep a rapidly mutating Doomsday under control, Lois and Jimmy have to sneak into LexCorp’s heavily guarded defense systems and disarm a black hole bomb (easy, right?) Once again, powers and intelligence play their part, but it is Superman’s ability to find, and bring out, the best in others that wins the day, when he manages to convince Luthor to join the fight. Luthor loads up his panacea, focusing its healing power to a few narrow meters, and fires it directly at Superman and Doomsday, stopping Doomsday once and for all - and incidentally, neutralizing the infection killing Superman.

Luthor swears that it wasn’t intentional. That he thought only Doomsday would perish. And Luthor will always have the nagging doubt that deep down he knew it would save Superman’s life - that deep down, Luthor wanted to save Superman’s life. Luthor’s glimpsed the best in himself and is so terrified of it that he will lash out, with even less mercy than ever, at anyone who reminds him of it.

And Superman, having seen that side in Luthor, will fight ever harder to bring it back out.

And the Legion realizes that all of them have forgotten the day that Superman was supposed to die, but that’s impossible. There’s no way that Superman could have forestalled destiny and time itself yet left everyone almost exactly as they were. No one can change the course of the mighty river of history, they say.

But of course, they’re wrong.

Superman can.

Beam me up Scotty! Quantum teleportation of a particle of light six kilometers

What if you could behave like the crew on the Starship Enterprise and teleport yourself home or anywhere else in the world? As a human, you’re probably not going to realize this any time soon; if you’re a photon, you might want to keep reading.

Through a collaboration between the University of Calgary, The City of Calgary and researchers in the United States, a group of physicists led by Wolfgang Tittel, professor in the Department of Physics and Astronomy at the University of Calgary have successfully demonstrated teleportation of a photon (an elementary particle of light) over a straight-line distance of six kilometres using The City of Calgary’s fibre optic cable infrastructure. The project began with an Urban Alliance seed grant in 2014.

This accomplishment, which set a new record for distance of transferring a quantum state by teleportation, has landed the researchers a spot in the journal Nature Photonics. The finding was published back-to-back with a similar demonstration by a group of Chinese researchers.

“Such a network will enable secure communication without having to worry about eavesdropping, and allow distant quantum computers to connect,” says Tittel.

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I commissioned the AMAZING artist starsandstark for a piece of art for my fic Data is King, and LOOK AT THIS MASTERPIECE SHE GAVE ME. I asked her to illustrate the scene below, an oh my gracious, it’s more than I could have EVER asked for ;_____^

And then Tony did something Steve hadn’t been expecting: he tugged down his shirt with one hand, then reached forward with his other and grabbed Steve’s hand, pressing it to his chest right overtop the… the “quantum computer”. The hard drive?

“This has me on it,” Tony explained, looking straight into Steve’s eyes. “All of me. It contains a blueprint of my DNA, and it scans my brain daily to update. I…” Tony hesitated, uncertainty shinning in his eyes for the first time. “I don’t know if it works. I know the data’s there. But I don’t know if scanning my brain would preserve my memories. Mind-body problem and all that. It might be good for nothing. It might not be able to bring me back, really me. But it was the best I could do.”

“You…” Steve stared confusedly at Tony. His hand clenched reflexively over Tony’s bare chest, searching for the extra heat under his fingers from the circuitry glowing cooly beneath Tony’s skin. There wasn’t any: just the average heat from Tony’s skin, warming Steve’s fingers. Tony shivered softly beneath his touch. “You have a back-up? A… A saved copy of yourself? On here?”

Tony’s smile was watery. “I was a kid, and I was scared. I didn’t know what the Board was going to do to me. All I knew was that my mind and my mind alone had the secret to quantum computers—a secret which could change the world. A secret which, coincidentally, I could use to make sure there would always be someone who knew how to build it—or at the very least, could learn how to build it, if my memories don’t back up.” Tony grimaced. “I hope they do. But I just can’t know for sure. Reproducing a physical brain-state might not be enough to reproduce the memories that brain contains. We just don’t know enough about how the brain-mind connection works… and I’m an engineer, not a neuroscientist.” He rolled his eyes, a small smile peaking at the corner of his lips. “Or a philosopher.”

Steve’s fingers stroked gently at the skin beneath them, at the amazing, genius, brilliant network of quantum data streams under his fingertips. “I don’t think I understood half of what you just said, but I got the gist of it,” Steve murmured.

Quantum network would be most precise clock yet

Physicists propose harnessing ‘quantum entanglement’ to surpass accuracy of any single atomic clock.

By exploiting the tricks of quantum physics, researchers say they could build a worldwide network of atomic clocks that are much more accurate than any single clock in existence today.

This global hook-up would enable countries to synchronize timekeeping standards and improve space navigation. It could also aid the exploration of fundamental physics concepts, such as the long-sought gravitational waves thought to be rippling through space and time.

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