Archive for the ‘quantum physics’ category: Page 727
May 17, 2017
IBM builds its most powerful universal quantum computing processors
Posted by Andreas Matt in categories: business, computing, education, quantum physics
IBM announced today it has successfully built and tested its most powerful universal quantum computing processors. The first new prototype processor will be the core for the first IBM Q early-access commercial systems. The first upgraded processor will be available for use by developers, researchers, and programmers to explore quantum computing using a real quantum processor at no cost via the IBM Cloud. The second is a new prototype of a commercial processor, which will be the core for the first IBM Q early-access commercial systems.
Launched in March 2017, IBM Q is an industry-first initiative to build commercially available universal quantum computing systems for business and science applications. IBM Q systems and services will be delivered via the IBM Cloud platform. IBM first opened public access to its quantum processors one year ago, to serve as an enablement tool for scientific research, a resource for university classrooms, and a catalyst of enthusiasm for the field. To date users have run more than 300,000 quantum experiments on the IBM Cloud.
With the introduction of two new processors today for IBM Q, the company is building the foundation for solving practical problems in business and science that are intractable even with today’s most powerful classical computing systems. The two new IBM-developed processors include:
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May 16, 2017
The human universe: Does consciousness create reality?
Posted by Shailesh Prasad in categories: neuroscience, quantum physics
While not a complete figment of our imagination, the universe may only become real because we’re looking at it.
By Douglas Heaven
Samuel Johnson thought the idea was so preposterous that kicking a rock was enough to silence discussion. “I refute it thus,” he cried as his foot rebounded from reality. Had he known about quantum mechanics, he might have spared himself the stubbed toe.
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May 15, 2017
Scientists Achieve Direct Counterfactual Quantum Communication For The First Time
Posted by Julius Garcia in categories: particle physics, quantum physics
Quantum communication is a strange beast, but one of the weirdest proposed forms of it is called counterfactual communication — a type of quantum communication where no particles travel between two recipients.
Theoretical physicists have long proposed that such a form of communication would be possible, but now, for the first time, researchers have been able to experimentally achieve it — transferring a black and white bitmap image from one location to another without sending any physical particles.
May 14, 2017
Scientists Have Set a Limit For Quantum Entanglement — And It’s Really Freaking Powerful
Posted by Andreas Matt in categories: particle physics, quantum physics
For the first time, scientists have subjected quantum entanglement to extreme levels of acceleration, and there’s nothing fragile about this “spooky action at a distance” - it’s way more robust than we thought.
In recent experiments, entangled particles held firm even while being accelerated to 30g — 30 times Earth’s acceleration — and the results could have a big impact on our search for a unified theory of modern physics.
“These experiments shall help [us] unify the theories of quantum mechanics and relativity,” says one of the team, Rupert Ursin, from the University of Vienna, Austria.
May 11, 2017
New materials bring quantum computing closer to reality
Posted by Carse Peel in categories: computing, quantum physics
May 10, 2017
There Are 2 Dimensions of Time, Theoretical Physicist States
Posted by Aleksandar Vukovic in category: quantum physics
May 10, 2017
Quantum Computing Demands a Whole New Kind of Programmer
Posted by Shailesh Prasad in categories: computing, quantum physics
Quantum computers finally seem to be coming of age with promises of “quantum supremacy” by the end of the year. But there’s a problem—very few people know how to work them.
The bold claim of achieving “quantum supremacy” came on the back of Google unveiling a new quantum chip design. The hyperbolic phrase essentially means building a quantum device that can perform a calculation impossible for any conventional computer.
In theory, quantum computers can crush conventional ones at important tasks like factoring large numbers. That’s because unlike normal computers, whose bits can either be represented as 0 or 1, a quantum bit—or “qubit”—can be simultaneously 0 and 1 thanks to a phenomenon known as superposition.
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May 10, 2017
Researchers demonstrated violation of Bell’s inequality on frequency-bin entangled photon pairs
Posted by Shailesh Prasad in categories: particle physics, quantum physics
Quantum entanglement, one of the most intriguing features of multi-particle quantum systems, has become a fundamental building block in both quantum information processing and quantum computation. If two particles are entangled, no matter how far away they are separated, quantum mechanics predicts that measurement of one particle leads to instantaneous wave-function collapse of the other particle.
Such “spooky action at a distance” is non-intuitive, and in 1935, Einstein attempted to use entanglement to criticize quantum mechanics to suggest that the quantum description of physical reality is incomplete. Einstein believed that no information could travel faster than light, and suggested that there might be some local hidden variable theories that could explain the world in a deterministic way, if and only if they obey realism and locality. In 1964, J. S. Bell showed that the debate can be experimentally resolved by testing an inequality; by measuring correlations between entangled parties, the result calculated from local hidden variable theories should be constrained by the Bell inequality, which, on the other hand, can be violated in the predictions of quantum mechanics.
By reducing the velocity of light dramatically, researchers at the Hong Kong University of Science and Technology implemented a Bell Test and were able to generate frequency-bin entangled narrowband biphotons from spontaneous four-wave mixing (SFWM) in cold atoms with a double-path configuration, where the phase difference between the two spatial paths can be controlled independently and nonlocally.
May 10, 2017
Researchers achieve direct counterfactual quantum communication
Posted by Shailesh Prasad in categories: particle physics, quantum physics
(Phys.org)—In the non-intuitive quantum domain, the phenomenon of counterfactuality is defined as the transfer of a quantum state from one site to another without any quantum or classical particle transmitted between them. Counterfactuality requires a quantum channel between sites, which means that there exists a tiny probability that a quantum particle will cross the channel—in that event, the run of the system is discarded and a new one begins. It works because of the wave-particle duality that is fundamental to particle physics: Particles can be described by wave function alone.
Well understood as a workable scheme by physicists, theoretical aspects of counterfactual communication have appeared in journals, but until recently, there have been no practical demonstrations of the phenomenon. Now, a collaborative of Chinese scientists has designed and experimentally tested a counterfactual communication system that successfully transferred a monochrome bitmap from one location to another using a nested version of the quantum Zeno effect. They have reported their results in the Proceedings of the National Academy of Sciences.
The quantum Zeno effect occurs when an unstable quantum system is subjected to a series of weak measurements. Unstable particles can never decay while they are being measured, and the system is effectively frozen with a very high probability. This is one of the implications of the well known but highly non-intuitive principle that looking at something changes it in the quantum realm.
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