Archive for the ‘quantum physics’ category
Apr 15, 2017
Posted by Saúl Morales Rodriguéz in categories: computing, quantum physics
The race to build larger and larger quantum computers is heating up, with several technologies competing for a role in future devices. Each potential platform has strengths and weaknesses, but little has been done to directly compare the performance of early prototypes. Now, researchers at the JQI have performed a first-of-its-kind benchmark test of two small quantum computers built from different technologies.
The team, working with JQI Fellow Christopher Monroe and led by postdoctoral researcher Norbert Linke, sized up their own small-scale quantum computer against a device built by IBM. Both machines use five qubits—the fundamental units of information in a quantum computer—and both machines have similar error rates. But while the JQI device relies on chains of trapped atomic ions, IBM Q uses coupled regions of superconducting material.
To make their comparison, the JQI team ran several quantum programs on the devices, each of which solved a simple problem using a series of logic gates to manipulate one or two qubits at a time. Researchers accessed the IBM device using an online interface, which allows anyone to try their hand at programming IBM Q.
Apr 11, 2017
Posted by Andreas Matt in categories: cosmology, information science, quantum physics
By Leah Crane
Break out the censor’s black bars for naked singularities. Quantum effects could be obscuring these impossible predictions of general relativity, new calculations show.
Albert Einstein’s classical equations of general relativity do a fairly good job of describing gravity and space-time. But when it comes to the most extreme objects, such as black holes, general relativity runs into problems.
Apr 10, 2017
Posted by Klaus Baldauf in categories: computing, quantum physics, transportation
Atomic defects in diamonds can be used as quantum memories. Researchers at TU Wien for the first time have succeeded in coupling the defects in various diamonds using quantum physics.
Diamonds with minute flaws could play a crucial role in the future of quantum technology. For some time now, researchers at TU Wien have been studying the quantum properties of such diamonds, but only now have they succeeded in coupling the specific defects in two such diamonds with one another. This is an important prerequisite for the development of new applications, such as highly sensitive sensors and switches for quantum computers. The results of the research will now be published in the journal Physical Review Letters (“Coherent Coupling of Remote Spin Ensembles via a Cavity Bus”).
Apr 6, 2017
Posted by Sean Brazell in categories: government, quantum physics, space travel
In November 2016 the International Business Times claimed the U.S. government was testing a version of the EmDrive on the Boeing X-37B and that the Chinese government has made plans to incorporate the EmDrive on its orbital space laboratory Tiangong-2. In 2009 an EmDrive technology transfer contract with Boeing was undertaken via a State Department TAA and a UK export licence, approved by the UK MOD. The appropriate US government agencies including DARPA, USAF and NSSO were aware of the contract. However, prior to flight, the propulsion experiment aboard the X-37B was officially announced as a test of a Hall-effect thruster built by Aerojet Rocketdyne.
Apr 2, 2017
Posted by Shane Hinshaw in categories: biotech/medical, quantum physics
Quantum physics is one of the most exciting and innovative areas of scientific research. By funding further research and development in quantum physics, great technological advancements will be made.
Think of every amazing future technology you’ve seen or read about in science fiction, or imagined yourself. Big innovations that change the world and cure disease or end war, and littler ones too, things that help us “think” a quick message to a friend without saying a word or share an experience from a distance. Quantum physics is enabling the creation of all of these futuristic technologies and some that didn’t even occur to most of us, making our sci-fi dreams part of our reality.
Mar 31, 2017
Posted by Shailesh Prasad in categories: cosmology, particle physics, quantum physics
Quantum gravity is a theoretical attempt to reconcile general relativity and the quantum field theories of particle physics. The theory holds that space and time are both quantized in a way that quantum field theory doesn’t account for. Attempts to find evidence in support of the theory have focused on the gravitational effects of black holes. Now, some are using the data collected by the Laser Interferometer Gravitational-Wave Observatory (LIGO) project that has now detected two instances of gravitational waves from the collision of black holes. And there are hints that the data has the evidence the researchers are looking for.
But Afshordi’s idea overthrows what physicists believed they knew about black holes. In Albert Einstein’s theory of general relativity, the event horizon of a black hole – the surface beyond which there is no escape – is insubstantial. Nothing special happens upon crossing it, just that there is no turning around later. If Afshordi is right, however, the inside of the black hole past the event horizon no longer exists. Instead, a Planck-length away from where the horizon would have been, quantum gravitational effects become large, and space-time fluctuations go wild. (The Planck length is a minuscule distance: about 10–35 metres, or 10–20 times the diameter of a proton.) It’s a complete break with relativity.
When he heard of the LIGO results, Afshordi realised that his so-far entirely theoretical idea could be observationally tested. If event horizons are different than expected, the gravitational-wave bursts from merging black holes should be different, too. Events picked up by LIGO should have echoes, a subtle but clear signal that would indicate a departure from standard physics. Such a discovery would be a breakthrough in the long search for a quantum theory of gravity. ‘If they confirm it, I should probably book a ticket to Stockholm,’ Afshordi said, laughing.
Mar 30, 2017
Posted by Andreas Matt in categories: particle physics, quantum physics, space
Scientists have discovered a new mechanism involved in the creation of paired light particles, which could have significant impact on the study of quantum physics.
Researchers at the University of East Anglia (UEA) have shown that when photons — the fundamental particles of light — are created in pairs, they can emerge from different, rather than the same, location.
The ground-breaking research could have significant implications for quantum physics, the theoretical basis of modern physics. Until now, the general assumption was that such photon pairs necessarily originate from single points in space.
Mar 29, 2017
Posted by Klaus Baldauf in categories: chemistry, quantum physics, robotics/AI
Rigetti Computing is building a cloud quantum computing platform for artificial intelligence and computational chemistry. Rigetti recently opened up private beta testing of Forest, its API for quantum computing in the cloud. Forest emphasizes a quantum-classical hybrid computing model, integrating directly with existing cloud infrastructure and treating the quantum computer as an accelerator.
Mar 28, 2017
Posted by Shane Hinshaw in categories: quantum physics, robotics/AI
AI, quantum computing will accelerate materials discovery.
IBM’s Watson is already at work developing novel polymers.
- March 28, 2017