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Archive for the ‘quantum physics’ category

Nov 26, 2021

A new artificial material mimics quantum entangled rare earth compounds

Posted by in categories: materials, quantum physics

By combining two-dimensional materials, researchers create a macroscopic quantum entangled state emulating rare earth compounds.

Nov 26, 2021

SC21: Chinese Supercomputer Approaches Quantum Performance

Posted by in categories: quantum physics, supercomputing

A roundup of news from SC21: With Frontier still not online, still no official Exascale systems in the Top500.

Nov 25, 2021

Negative Energy, Quantum Information and Causality — Adam Levine

Posted by in categories: engineering, information science, particle physics, quantum physics

Friends Lunch with a Member.

Topic: Negative Energy, Quantum Information and Causality.
Speaker: Adam Levine.
Date: November 19, 2021

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Nov 25, 2021

Quantum double-slit experiment done with molecules for the first time

Posted by in categories: particle physics, quantum physics

Researchers prepare ‘new type of matter’ to conduct classic wave-particle duality experiment.


The iconic quantum double-slit experiment, which reveals how matter can behave like waves that displays interference and superposition, has for the first time been demonstrated with individual molecules as the slits.

Richard Feynman once said that the double-slit experiment reveals the central puzzles of quantum mechanics, putting us ‘up against the paradoxes and mysteries and peculiarities of nature’.

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Nov 24, 2021

On-chip frequency shifters in the gigahertz range could be used in next generation quantum computers and networks

Posted by in categories: computing, internet, quantum physics, space

The ability to precisely control and change properties of a photon, including polarization, position in space, and arrival time, gave rise to a wide range of communication technologies we use today, including the Internet. The next generation of photonic technologies, such as photonic quantum networks and computers, will require even more control over the properties of a photon.

One of the hardest properties to change is a photon’s color, otherwise known as its frequency, because changing the frequency of a photon means changing its energy.

Today, most frequency shifters are either too inefficient, losing a lot of light in the , or they can’t convert light in the gigahertz range, which is where the most important frequencies for communications, computing, and other applications are found.

Nov 24, 2021

Can quantum mechanics explain consciousness?

Posted by in categories: neuroscience, quantum physics

Well beyond Descartes and his mind-body duality, new questions have emerged that are as exciting as they are nebulous: Does quantum physics play a role in how the brain works? Or, more profoundly, is the mind, viewed as a collection of possible brain states, sustained by quantum effects? Or can it all be treated using classical physics?

There is nothing better than mixing two great mysteries to produce an even bigger one.

Nov 24, 2021

256-qubit Quantum Computer Unveiled

Posted by in categories: computing, particle physics, quantum physics

The first 256-qubit quantum computer has been announced by startup company QuEra, founded by MIT and Harvard scientists.

QuEra Computing Inc. – a new Boston, Massachusetts-based company – has emerged from stealth mode with $17 million in funding and has completed the assembly of a 256-qubit device. Its funders include Japanese e-commerce giant Rakuten, Day One Ventures, Frontiers Capital, and the leading tech investors Serguei Beloussov and Paul Maritz. The company recently received a DARPA award, and has already generated $11 million in revenue.

QuEra Computing recently achieved ground-breaking research on neutral atoms, developed at Harvard University and the Massachusetts Institute of Technology, which is being used as the basis for a highly scalable, programmable quantum computer solution. The QuEra team is aiming to build the world’s most powerful quantum computers to take on computational tasks that are currently deemed impossibly hard.

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Nov 24, 2021

A new artificial material mimics quantum-entangled rare earth compounds

Posted by in categories: computing, particle physics, quantum physics

Physicists have created a new ultra-thin, two-layer material with quantum properties that normally require rare earth compounds. This material, which is relatively easy to make and does not contain rare earth metals, could provide a new platform for quantum computing and advance research into unconventional superconductivity and quantum criticality.

The researchers showed that by starting from seemingly common materials, a radically new quantum state of matter can appear. The discovery emerged from their efforts to create a quantum spin liquid which they could use to investigate emergent quantum phenomena such as gauge theory. This involves fabricating a single layer of atomically thin tantalum disulphide, but the process also creates islands that consist of two layers.

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Nov 24, 2021

Math may have caught up with Google’s quantum-supremacy claims

Posted by in categories: computing, mathematics, quantum physics

But, given the rapidly evolving quantum computing landscape, that may not matter.

Nov 23, 2021

The Mathematical Structure of Particle Collisions Comes Into View

Posted by in categories: computing, information science, mathematics, particle physics, quantum physics

And that’s where physicists are getting stuck.

Zooming in to that hidden center involves virtual particles — quantum fluctuations that subtly influence each interaction’s outcome. The fleeting existence of the quark pair above, like many virtual events, is represented by a Feynman diagram with a closed “loop.” Loops confound physicists — they’re black boxes that introduce additional layers of infinite scenarios. To tally the possibilities implied by a loop, theorists must turn to a summing operation known as an integral. These integrals take on monstrous proportions in multi-loop Feynman diagrams, which come into play as researchers march down the line and fold in more complicated virtual interactions.

Physicists have algorithms to compute the probabilities of no-loop and one-loop scenarios, but many two-loop collisions bring computers to their knees. This imposes a ceiling on predictive precision — and on how well physicists can understand what quantum theory says.

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