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Real-world intercontinental quantum communications enabled by the Micius satellite

A joint China-Austria team has performed quantum key distribution between the quantum-science satellite Micius and multiple ground stations located in Xinglong (near Beijing), Nanshan (near Urumqi), and Graz (near Vienna). Such experiments demonstrate the secure satellite-to-ground exchange of cryptographic keys during the passage of the satellite Micius over a ground station. Using Micius as a trusted relay, a secret key was created between China and Europe at locations separated up to 7,600 km on the Earth.

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Leaving flatland – quantum Hall physics in 4-D

In literature, the potential existence of extra dimensions was discussed in Edwin Abbott’s satirical novel “Flatland: A Romance of Many Dimensions” (1884), portraying the Victorian society in 19th century England as a hierarchical two-dimensional world, incapable of realizing its narrow-mindedness due to its lower-dimensional nature.

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Physicists Aim to Classify All Possible Phases of Matter | Quanta Magazine

A complete classification could lead to a wealth of new materials and technologies. But some exotic phases continue to resist understanding.

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Long-lived storage of a photonic qubit for worldwide teleportation

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor Gerhard Rempe at the Max Planck Institute of Quantum Optics (MPQ) have now achieved a major breakthrough: they demonstrated the long-lived storage of a photonic qubit on a single atom trapped in an optical resonator. The coherence time of the stored quantum bit outlasts 100 milliseconds and therefore matches the requirement for the creation of a global quantum network in which qubits are directly teleported between end nodes. “The coherence times that we achieve represent an improvement by two orders of magnitude compared to the current state-of-the-art,” says Professor Rempe. The study is published in Nature Photonics today.

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Complete design of a silicon quantum computer chip unveiled

Research teams all over the world are exploring different ways to design a working computing chip that can integrate quantum interactions. Now, UNSW engineers believe they have cracked the problem, reimagining the silicon microprocessors we know to create a complete design for a quantum computer chip that can be manufactured using mostly standard industry processes and components.

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Microsoft Launches Free Preview Version Of Its Quantum Development Kit | HotHardware

Back in September, we talked about the groundwork Microsoft was laying for quantum computing with a new programming language in development. Not even three months later, Microsoft is ready to toss a free preview version of that new language to the public and it’s called the Quantum Development Kit. That dev kit includes the Q# programming

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String Theory’s Strange Second Life | Quanta Magazine

String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the

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Physicists Just Transferred Quantum Data Between Different Materials For The First Time

Scientists just took a big step towards the goal of quantum computers, and even a quantum internet to connect them, after successfully using photons to transfer quantum information between a cold atomic gas and a solid crystal.

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Physicists Discover New Kind of Matter: Excitonium

Excitonium sounds like a made-up substance from a children’s graphic novel. But it is an actual scientific word, coined 50 years ago to describe new a type of matter, which scientists believed should exist, but weren’t able to prove-until now. Physicists at the University of Illinois said that they have now proven that excitonium really …

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The Quantum Thermodynamics Revolution | Quanta Magazine

As physicists extend the 19th-century laws of thermodynamics to the quantum realm, they’re rewriting the relationships among energy, entropy and information.

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Edward Witten Ponders the Nature of Reality

Edward Witten reflects on the meaning of dualities in physics and math, emergent space-time, and the pursuit of a complete description of nature.

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Key component to scale up quantum computing

A team at the University of Sydney and Microsoft, in collaboration with Stanford University in the US, has miniaturised a component that is essential for the scale-up of quantum computing. The work constitutes the first practical application of a new phase of matter, first discovered in 2006, the so-called topological insulators.

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The Power of Mirror Symmetry

Ideas that originate in particle physics have an uncanny tendency to appear in the most diverse mathematical fields. This is especially true for string theory. Its stimulating influence in mathematics will have a lasting and rewarding impact, whatever its final role in fundamental physics turns out to be. The number of disciplines that it touches is dizzying: analysis, geometry, algebra, topology, representation theory, combinatorics, probability-the list goes on and on.

Japan launches its first quantum computer

Japan has unveiled its first quantum computer prototype, amid a global race to build ever-more powerful machines with faster speeds and larger brute force that are key towards realising the full potential of artificial intelligence.

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Newfound Wormhole Allows Information to Escape Black Holes | Quanta Magazine

Physicists theorize that a new “traversable” kind of wormhole could resolve a baffling paradox and rescue information that falls into black holes.

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The Universe Began With a Big Melt, Not a Big Bang – Issue 53: Monsters – Nautilus

There are two tantalizing mysteries about our universe, one dealing with its final fate and the other with its beginning, that have…

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Turning ions into quantum cats

In Schrödinger’s famous thought experiment, a cat seems to be both dead and alive-an idea that strains credulity. These days, cats still don’t act this way, but physicists now regularly create analogues of Schrödinger’s cat in the lab by smearing the microscopic quantum world over longer and longer distances.
Such “cat states” have found many homes, promising more sensitive quantum measurements and acting as the basis for quantum error-correcting codes-a necessary component for future error-prone quantum computers.

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New type of supercomputer could be based on ‘magic dust’ combination of light and matter

The researchers, from Cambridge, Southampton and Cardiff Universities in the UK and the Skolkovo Institute of Science and Technology in Russia, have used quantum particles known as polaritons – which are half light and half matter – to act as a type of ‘beacon’ showing the way to the simplest solution to complex problems. This entirely new design could form the basis of a new type of computer that can solve problems that are currently unsolvable, in diverse fields such as biology, finance or space travel.

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What Sonic Black Holes Say About Real Ones | Quanta Magazine

Can a fluid analogue of a black hole point physicists toward the theory of quantum gravity, or is it a red herring?

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High-speed Quantum Memory for Photons

Physicists from the University of Basel have developed a memory that can store photons. These quantum particles travel at the speed of light and are thus suitable for high-speed data transfer. The researchers were able to store them in an atomic vapor and read them

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Ultracold molecules hold promise for quantum computing

A study by MIT researchers shows that collections of ultracold molecules can retain the information stored in them for hundreds of times longer than previously achieved in these materials. These clusters might thus serve as “qubits,” the basic building blocks of quantum computers.