Teleporting Toward a Quantum Internet

Quantum physics is a field that appears to give scientists superpowers. Those who understand the world of extremely small or cold particles can perform amazing feats with them – including teleportation – that appear to bend reality.

“Demonstrating quantum effects such as teleportation outside of a lab environment involves a whole new set of challenges. This experiment shows how these challenges can all be overcome and hence it marks an important milestone towards the future quantum Internet.”

The science behind these feats is complicated, and until recently, didn’t exist outside of lab settings. But that’s changing: researchers have begun to implement quantum teleportation in real-world contexts. Being able to do so just might revolutionize modern phone and Internet communications, leading to highly secure, encrypted messaging.

Image above: This image shows crystals used for storing entangled photons, which behave as though they are part of the same whole. Scientists use crystals like these in quantum teleportation experiments. Image Credits: Félix Bussières/University of Geneva.

A paper published in Nature Photonics and co-authored by engineers at NASA’s Jet Propulsion Laboratory, Pasadena, California, details the first experiments with quantum teleportation in a metropolitan fiber cable network. For the first time, the phenomenon has been witnessed over long distances in actual city infrastructure. In Canada, University of Calgary researchers teleported the quantum state of a photon more than 3.7 miles (6 kilometers) in “dark” (unused) cables under the city of Calgary. That’s a new record for the longest distance of quantum teleportation in an actual metropolitan network.

“By using advanced superconducting detectors, we can use individual photons to efficiently communicate both classical and quantum information from space to the ground. We are planning to use more advanced versions of these detectors for demonstrations of optical communication from deep space and of quantum teleportation from the International Space Station.”

While longer distances had been recorded in the past, those were conducted in lab settings, where photons were fired through spools of cable to simulate the loss of signal caused by long distances. This latest series of experiments in Calgary tested quantum teleportation in actual infrastructure, representing a major step forward for the technology.

“Demonstrating quantum effects such as teleportation outside of a lab environment involves a whole new set of challenges. This experiment shows how these challenges can all be overcome and hence it marks an important milestone towards the future quantum Internet,” said Francesco Marsili, one of the JPL co-authors. “Quantum communication unlocks some of the unique properties of quantum mechanics to, for example, exchange information with ultimate security or link together quantum computers.”

Image above: This image shows crystals used for storing entangled photons, which behave as though they are part of the same whole. Scientists use crystals like these in quantum teleportation experiments. Image Credits: Félix Bussières/University of Geneva.

“The superconducting detector platform, which has been pioneered by JPL and NIST researchers, makes it possible to detect single photons at telecommunications wavelengths with nearly perfect efficiency and almost no noise. This was simply not possible with earlier detector types, and so experiments such as ours, using existing fiber-infrastructure, would have been close to impossible without JPL’s detectors.”

Photon sensors for the experiment were developed by Marsili and Matt Shaw of JPL’s Microdevices Laboratory, along with colleagues at the National Institute of Standards and Technology, Boulder, Colorado. Their expertise was critical to the experiments: quantum networking is done with photons, and requires some of the most sensitive sensors in the world in order to know exactly what’s happening to the particle.

“The superconducting detector platform, which has been pioneered by JPL and NIST researchers, makes it possible to detect single photons at telecommunications wavelengths with nearly perfect efficiency and almost no noise. This was simply not possible with earlier detector types, and so experiments such as ours, using existing fiber-infrastructure, would have been close to impossible without JPL’s detectors,” said Daniel Oblak of the University of Calgary’s Institute for Quantum Science and Technology.

Safer emails using quantum physics

Shrink down to the level of a photon, and physics starts to play by bizarre rules. Scientists who understand those rules can “entangle” two particles so that their properties are linked. Entanglement is a mind-boggling concept in which particles with different characteristics, or states, can be bound together across space. That means whatever affects one particle’s state will affect the other, even if they’re located miles apart from one another.

This is where teleportation comes in. Imagine you have two entangled particles – let’s call them Photon 1 and Photon 2 – and Photon 2 is sent to a distant location. There, it meets with Photon 3, and the two interact with each other. Photon 3’s state can be transferred to Photon 2, and automatically “teleported” to the entangled twin, Photon 1. This disembodied transfer happens despite the fact that Photons 1 and 3 never interact. Read the rest of this entry »


Doing His Part: Meet The Man Who Shakes His Head Whenever He Hears About Terrorist Attacks

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If you love stories about inspiring Americans, then wait till you hear about this guy.

His name is Evan Lowell, and he’s a 43-year-old marketing consultant from Pasadena, CA. You wouldn’t know it from looking at him, but Evan is a hero. And he’s doing his part to help the world in a really special way: Whenever Evan hears about a terrorist attack happening somewhere, he shakes his head.

Inspiring!

Any time Evan hears about a bombing in Kabul or a shooting in Jerusalem, he immediately stops whatever he’s doing and solemnly shakes his head from side to side while letting out a brief, mournful sigh. Depending on the severity of the attack, he sometimes even says “Goddammit” or “Not again.” A humble hero determined…(read more)

Source: ClickHole


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NASA’S Mars Curiosity Debuts Autonomous Navigation

This mosaic of images from the Navigation Camera (Navcam) on NASA's Mars rover Curiosity shows the scene from the rover's position on the 376th Martian day, or sol, of the mission (Aug. 27, 2013). The images were taken right after Curiosity completed the first drive during which it used autonomous navigation on unknown ground. Credit: NASA/JPL-Caltech › Full image and caption

This mosaic of images from the Navigation Camera (Navcam) on NASA’s Mars rover Curiosity shows the scene from the rover’s position on the 376th Martian day, or sol, of the mission (Aug. 27, 2013). The images were taken right after Curiosity completed the first drive during which it used autonomous navigation on unknown ground. Credit:NASA/JPL-Caltech                                                                                              › Full image and caption

PASADENA, Calif. – NASA’s Mars rover Curiosity has used autonomous navigation for the first time, a capability that lets the rover decide for itself how to drive safely on Mars.

This latest addition to Curiosity’s array of capabilities will help the rover cover the remaining ground en route to Mount Sharp, where geological layers hold information about environmental changes on ancient Mars. The capability uses software that engineers adapted to this larger and more complex vehicle from a similar capability used by NASA’s Mars Exploration Rover Opportunity, which is also currently active on Mars.

Read the rest of this entry »