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Archive for the ‘quantum physics’ category

Feb 19, 2019

Explainer: What is quantum communication?

Posted by in categories: business, cybercrime/malcode, health, quantum physics

Barely a week goes by without reports of some new mega-hack that’s exposed huge amounts of sensitive information, from people’s credit card details and health records to companies’ valuable intellectual property. The threat posed by cyberattacks is forcing governments, militaries, and businesses to explore more secure ways of transmitting information.

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Feb 19, 2019

Breakthrough in the search for graphene-based electronics

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

For 15 years, scientists have tried to exploit the “miracle material” graphene to produce nanoscale electronics. On paper, graphene should be great for just that: it is ultra-thin—only one atom thick and therefore two-dimensional, it is excellent for conducting electrical current, and holds great promise for future forms of electronics that are faster and more energy efficient. In addition, graphene consists of carbon atoms – of which we have an unlimited supply.

In theory, graphene can be altered to perform many different tasks within e.g. electronics, photonics or sensors simply by cutting tiny patterns in it, as this fundamentally alters its . One “simple” task, which has turned out to be surprisingly difficult, is to induce a band gap—which is crucial for making transistors and optoelectronic devices. However, since graphene is only an atom thick all of the atoms are important and even tiny irregularities in the pattern can destroy its properties.

“Graphene is a fantastic material, which I think will play a crucial role in making new nanoscale electronics. The problem is that it is extremely difficult to engineer the electrical properties,” says Peter Bøggild, professor atDTU Physics.

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Feb 19, 2019

Observation of quantized heating in quantum matter

Posted by in categories: energy, law, mathematics, quantum physics

Shaking a physical system typically heats it up, in the sense that the system continuously absorbs energy. When considering a circular shaking pattern, the amount of energy that is absorbed can potentially depend on the orientation of the circular drive (clockwise/anti-clockwise), a general phenomenon known as circular dichroism.

In 2017, Nathan Goldman (ULB, Brussels), Peter Zoller (IQOQI, Innsbruck) and coworkers predicted that can be quantized in (heating is then constrained by strict integers) forming a “topological state.” According to this , the quantization of energy absorption upon circular driving can be directly related to topology, a fundamental mathematical concept that characterizes these intriguing states of matter.

Writing in Nature Physics, the experimental group of Klaus Sengstock and Christof Weitenberg (Hamburg), in collaboration with the team of Nathan Goldman, reports on the first observation of quantized circular dichroism. Following the theoretical proposal of Goldman, Zoller et al., the experimentalists realized a topological state using an ultracold atomic gas subjected to , and studied its heating properties upon circular shaking of the gas. By finely monitoring the heating rates of their system, for a wide range of driving frequencies, they were able to validate the quantization law predicted by Goldman, Zoller et al. in 2017, in agreement with the underlying topological state realized in the laboratory.

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Feb 18, 2019

How quantum dots supercharge farming, medicine and solar, too

Posted by in categories: biotech/medical, food, quantum physics

Circa 2018


From medical to agricultural to solar, quantum dots have uses far beyond the humble TV.

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Feb 18, 2019

Sound waves get quantum systems to ‘talk’

Posted by in category: quantum physics

Sound waves could help get quantum technology closer to reality, researchers say.

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Feb 15, 2019

Are birds using quantum entanglement to navigate?

Posted by in category: quantum physics

Sounds wild, but it may well be so.

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Feb 15, 2019

How quantum terrorists could bring down the future internet

Posted by in categories: internet, quantum physics, terrorism

Malicious actors could exploit the laws of quantum mechanics to destroy quantum information on a global scale, say physicists.

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Feb 15, 2019

Single Photon Reveals Quantum Entanglement of 16 Million Atoms

Posted by in categories: particle physics, quantum physics

Scientists have demonstrated entanglement between 16 million atoms in a crystal crossed by a single photon, reinforcing the quantum theory that entanglement can persist in macroscopic physical systems.

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Feb 15, 2019

One step closer to complex quantum teleportation

Posted by in categories: encryption, information science, quantum physics, robotics/AI

Circa 2018


The experimental mastery of complex quantum systems is required for future technologies like quantum computers and quantum encryption. Scientists from the University of Vienna and the Austrian Academy of Sciences have broken new ground. They sought to use more complex quantum systems than two-dimensionally entangled qubits and thus can increase the information capacity with the same number of particles. The developed methods and technologies could in the future enable the teleportation of complex quantum systems. The results of their work, “Experimental Greenberger-Horne-Zeilinger entanglement beyond qubits,” is published recently in the renowned journal Nature Photonics.

Similar to bits in conventional computers, qubits are the smallest unit of in . Big companies like Google and IBM are competing with research institutes around the world to produce an increasing number of entangled qubits and develop a functioning quantum computer. But a research group at the University of Vienna and the Austrian Academy of Sciences is pursuing a new path to increase the information capacity of complex quantum systems.

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Feb 15, 2019

D-Wave Launches Free Quantum Cloud Service

Posted by in category: quantum physics

Circa 2018


Canadian company joins IBM and Rigetti in offering online access to pricey hardware.

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