Archive for the ‘quantum physics’ category: Page 577

Jan 19, 2017

The PBR Theorem explained

Posted by in categories: particle physics, quantum physics

The PBR theorem is another theorem of quantum mechanics, which could go alongside Bell’s Theorem and the Kochen-Specker Theorem. I wrote this explanation in 2011, before the paper was officially published in Nature. Since then, it’s been recognized as a moderately important theorem, and it has been named after its three authors (Pusey, Barrett, and Rudolph). But at the time I didn’t really know whether it would become important.

There’s a new paper on arxiv called “The quantum state cannot be interpreted statistically “. It has a theorem which proves that, given a few basic assumptions, the quantum state (ie the wavefunction) must be real, rather than a merely statistical object. Nature has an article which mostly just harps on how “seismic” the paper is.

Nature (correction: the article’s author, not Nature itself) compares its importance to Bell’s Theorem, which is a very important result indeed from 1964. Bell’s theorem proved that if there were “hidden variables” underneath the quantum state, then entangled particles must be communicating with each other faster than light. I’ve explained Bell’s theorem in the past.

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Jan 19, 2017

Physicists Say They’ve Manipulated ‘Pure Nothingness’ and Observed the Fallout

Posted by in categories: particle physics, quantum physics

According to quantum mechanics, a vacuum isn’t empty at all. It’s actually filled with quantum energy and particles that blink in and out of existence for a fleeting moment — strange signals that are known as quantum fluctuations.

For decades, there had only ever been indirect evidence of these fluctuations, but back in 2015, researchers claimed to have detected the theoretical fluctuations directly. And now the same team says they’ve gone a step further, having manipulated the vacuum itself, and detecting the changes in these strange signals in the void.

We’re entering the territory of high-level physics here, but what’s really important in this experiment is that, if these results are confirmed, the researchers might have just unlocked a way to observe, probe, and test the quantum realm without interfering with it.

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Jan 18, 2017

Memristor can do multistate processing as well as nonvolatile memory

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

Nice; ReRam with multi-state processing and reliable storage.

Short of full blown molecular computers or universal quantum computers or optical computers memristors have the most potential for a hardware change to dramatically boost the power and capabilities of computers. The boost to computer power could be nearly a million times by fully leveraging memristors. It would likely be more like a thousand times with more near to mid term usage of memristors.

Memristors (aka ReRAM) could become computer memory that is over 10 times denser than Flash or DRAM in two dimensions. Memristors like flash would be nonvolatile memory that would not need power for retain memory. Memristors are created from nanowire lattices which could be stacked in three dimensions. Memristors have also previously been shown to behave like brain synapses which could be used for computer architectures that emulate the human brain for neuromorphic computing. Now there is work on multistate memristors that perform computation. This means that eventually processing and memory could be tightly integrated.

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Jan 18, 2017

China’s Quantum Communication Satellite Delivered for Use

Posted by in categories: quantum physics, satellites

QC communications (includes networking) is now available in China.

Nice job China; now if the rest of us can catch up.

China’s quantum communication satellite, launched last August, is officially operational after four months of in-orbit testing, the Chinese Academy of Sciences (CAS) said Wednesday.

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Jan 18, 2017

China’s quantum science satellite begins ‘spooky’ and ‘unhackable’ experiments

Posted by in categories: cybercrime/malcode, quantum physics, satellites, science

Hope folks are realizing this is happening and now real. Not sure what experiments their doing as they have already been experimenting already on hacking.

The world’s first quantum science and communications satellite has been handed over to Chinese scientists for the official start of experiments to test the phenomena of quantum entanglement and ‘unhackable’ quantum communication.

The Quantum Experiments at Space Scale (QUESS) satellite was launched on August 15 last year and soon after began testing its payloads and space-to-ground links.

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Jan 15, 2017

Quantum oracle: AI predicts and fixes qubit failure

Posted by in categories: quantum physics, robotics/AI

We’re definitely not a ways off for QC being available to the masses unless you believe 5 years is a long time.

Machine learning kept unstable quantum bits in line – even before they wavered. Cathal O’Connell reports.

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Jan 15, 2017

Sydney Uni predicts the unpredictable in quantum computing advancement

Posted by in categories: quantum physics, robotics/AI

New method is making QC even more reliable.

The university has moved one step closer to quantum computing becoming a reality, using machine learning to predict the demise of a quantum bit, thus extending its useful life.

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Jan 15, 2017

Now Quantum Computers Can Send Information Using a Single Particle of Light

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

Physicists at Princeton University have revealed a device they’ve created that will allow a single electron to transfer its quantum information to a photon. This is a revolutionary breakthrough for the team as it gets them one step closer to producing the ultimate quantum computer. The device is the result of five years worth of research and could accelerate the world of quantum computing no end.

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Jan 14, 2017

Seeing the quantum future… literally

Posted by in categories: computing, quantum physics

Scientists at the University of Sydney have demonstrated the ability to “see” the future of quantum systems, and used that knowledge to preempt their demise, in a major achievement that could help bring the strange and powerful world of quantum technology closer to reality.

The applications of quantum-enabled technologies are compelling and already demonstrating significant impacts — especially in the realm of sensing and metrology. And the potential to build exceptionally powerful quantum computers using quantum bits, or qubits, is driving investment from the world’s largest companies.

However a significant obstacle to building reliable quantum technologies has been the randomisation of by their environments, or decoherence, which effectively destroys the useful quantum character.

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Jan 13, 2017

This Material Could Reveal the Link Between Classical Physics and the Quantum Realm

Posted by in categories: energy, quantum physics

In Brief

  • Scientists are a little bit closer to unlocking the mystery of how the rules of the quantum realm translate to the rules of the classical physics of the observable world.
  • Experts predict that the materials used in this research, topological insulators, will play a key role in furthering this development.

It’s no surprise that quantum physics can be disorienting to the casual observer; after all, it does follow its own set of rules quite different from those of classical physics which rule over our everyday experience. In the quantum realm, things can and cannot be at the same time (to a certain extent) or are continually moving without spending energy. These don’t apply to the physics of macro-level matter.

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