Archive for the ‘quantum physics’ category: Page 2

Jul 6, 2022

Novel quantum simulation method clarifies correlated properties of complex material 1T —TaS2

Posted by in categories: particle physics, quantum physics

A team led by Philipp Werner, professor of physics at the University of Fribourg and leader of NCCR MARVEL’s Phase 3 project Continued Support, Advanced Simulation Methods, has applied their advanced quantum simulation method to the investigation of the complex material 1T-TaS2. The research, recently published in Physical Review Letters, helped resolve a conflict between earlier experimental and theoretical results, showing that the surface region of 1T-TaS2 exhibits a nontrivial interplay between band insulating and Mott insulating behavior when the material is cooled to below 180 k.

1T-TaS2 is a layered transition metal dichalcogenide that has been studied intensively for decades because of intriguing links between temperature dependent distortions in the lattice and phenomena linked to electronic correlations.

Upon cooling, the material undergoes a series of lattice rearrangements with a simultaneous redistribution of the electronic density, a phenomenon known as charge density wave (CDW) order. In the reached when the material is cooled to below 180 k, an in-plane periodic lattice distortion leads to the formation of star-of-David (SOD) clusters made of 13 tantalum atoms. Simultaneously, a strong increase in resistivity is observed. Additional interesting properties of the low temperature phase include a transition to a under pressure as well as the possibility to switch this phase into long-lived metallic metastable phases by applying short pulses of laser or voltage, making the material potentially interesting for use in future memory devices.

Jul 6, 2022

How Quantum Computing is Creating an Impact on Artificial Intelligence

Posted by in categories: quantum physics, robotics/AI

The advanced global tech market is set to experience the effect of quantum computing on artificial intelligence in 2022 and beyond. It is essential to integrate quantum computing into artificial intelligence models to boost decision-making abilities more efficiently.

Jul 6, 2022

Mathematical calculations show that quantum communication across interstellar space should be possible

Posted by in categories: mathematics, particle physics, quantum physics, space travel

A team of physicists at the University of Edinburgh’s School of Physics and Astronomy has used mathematical calculations to show that quantum communications across interstellar space should be possible. In their paper published in the journal Physical Review D, the group describes their calculations and also the possibility of extraterrestrial beings attempting to communicate with us using such signaling.

Over the past several years, scientists have been investigating the possibility of using quantum communications as a highly secure form of message transmission. Prior research has shown that it would be nearly impossible to intercept such messages without detection. In this new effort, the researchers wondered if similar types of communications might be possible across . To find out, they used that describes that movement of X-rays across a medium, such as those that travel between the stars. More specifically, they looked to see if their calculations could show the degree of decoherence that might occur during such a journey.

With quantum communications, engineers are faced with quantum particles that lose some or all of their unique characteristics as they interact with obstructions in their path—they have been found to be quite delicate, in fact. Such events are known as decoherence, and engineers working to build quantum networks have been devising ways to overcome the problem. Prior research has shown that the space between the stars is pretty clean. But is it clean enough for ? The math shows that it is. Space is so clean, in fact, that X-ray photons could travel hundreds of thousands of light years without becoming subject to decoherence—and that includes gravitational interference from astrophysical bodies. They noted in their work that optical and microwave bands would work equally well.

Jul 5, 2022

NIST Acknowledges First Four Quantum-Resistant Encryption Tools

Posted by in categories: computing, encryption, information science, quantum physics

The US Department of Commerce’s National Institute of Standards and Technology (NIST) has selected the first-ever group of encryption tools that could potentially withstand the attack of a quantum computer.

The four selected encryption algorithms will now reportedly become part of NIST’s post-quantum cryptographic (PQC) standard, which should be finalized in about two years.

More specifically, for general encryption (used for access to secure websites), NIST has selected the CRYSTALS-Kyber algorithm.

Jul 5, 2022

Observation of a strange pentaquark, a doubly charged tetraquark and its neutral partner

Posted by in categories: particle physics, quantum physics

The two tetraquarks, Tacs0 (2900)++ and Tacs0 (2900)0, are observed in joint analysis of the B0→ D0Ds+π and B+→DDs+ π+ decays. The new tetraquarks are observed with masses around 2.9 GeV in both the Ds+π+ and Ds+π mass spectra. The former corresponds to the first observation of a doubly charged open-charm tetraquark with minimal quark content csud and the latter is a neutral tetraquark composed of csud quarks. The Ds+π+ and Ds+π mass spectra in the top images above indicate that the sum of contributions from conventional resonances (particles) cannot explain experimental distribution around the mass of 2.9 GeV. On the other hand, the experimental distributions are well understood when the contributions of the two new teraquarks are included in the analysis as shown in the two bottom images above. The mass and the width are determined to be 2.908±0.011±0.02 GeV and 0.136±0.023±0.011 GeV, respectively. The quantum numbers are determined to be JP=0+. In the language of particle physics the two tetraquarks are isospin partners.

In the conventional quark model, strongly interacting particles known as hadrons are formed either from quark-antiquark pairs (mesons) or three quarks (baryons). Particles which cannot be classified within this scheme are referred to as exotic hadrons. In their fundamental 1964 papers [1] and [2], in which they proposed the quark model, Murray Gell-Mann and George Zweig mentioned the possibility of adding a quark-antiquark pair to a minimal meson or baryon quark configuration. It took 50 years, however, for physicists to obtain unambiguous experimental evidence of the existence of these exotic hadrons. In April 2014 the LHCb collaboration published measurements that demonstrated that the Z(4430) particle, first observed by the Belle collaboration, is composed of four quarks (ccdu).

Jul 5, 2022

Why Tesla built New Radar

Posted by in categories: computing, quantum physics

Major change for Tesla? Adding radar after years of claiming it isn’t needed for FSD?

Radars are fun! In this video I explain New Tesla Radar.
Why Tesla did build New Radar in house?

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Jul 5, 2022

Quantum Processor Completes 9,000 Years of Work in 36 Microseconds

Posted by in categories: information science, quantum physics, supercomputing

The future is now!

Technology continues to move forward at incredible speeds and it seems like every week we learn about a new breakthrough that changes our minds about what is possible.

Researchers in Toronto used a photonic quantum computer chip to solve a sampling problem that went way beyond the fastest computers and algorithms.

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Jul 5, 2022

Dalle-Mini/Dalle-Mini · Quantum Mechanics

Posted by in categories: quantum physics, robotics/AI

We’re on a journey to advance and democratize artificial intelligence through open source and open science.

Jul 3, 2022

World’s first quantum computer integrated circuit

Posted by in categories: computing, quantum physics

The world’s first quantum computer integrated circuit has been demonstrated by researchers in Australia. This could enable accurate simulations of molecules, leading to the creation of new materials.

Jul 3, 2022

New Quantum Camera Capable of Snapping Photos of ‘Ghosts’

Posted by in categories: electronics, quantum physics

Circa 2020

By utilizing a process that Einstein famously called “spooky,” scientists have successfully caught “ghosts” on film for the first time using quantum cameras.

The “ghosts” captured on camera weren’t the kind you might first think; scientists didn’t discover the wandering lost souls of our ancestors. Rather, they were able to capture images of objects from photons that never actually encountered the objects pictured. The technology has been dubbed “ghost imaging,” reports National Geographic.

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