Phys.org news tagged with:qubit
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en-usPhys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.Controlling interactions between distant qubitsA big part of the burgeoning science of quantum computation is reliably storing and processing information in the form of quantum bits, or qubits. One of the obstacles to this goal is the difficulty of preserving the fragile quantum condition of qubits against unwanted outside influence even as the qubits interact among themselves in a programmatic way.
http://phys.org/news/2015-07-interactions-distant-qubits.html
Quantum Physics Thu, 23 Jul 2015 09:10:02 EDTnews356858526Quantum computer emulated by a classical system(Phys.org)—Quantum computers are inherently different from their classical counterparts because they involve quantum phenomena, such as superposition and entanglement, which do not exist in classical digital computers. But in a new paper, physicists have shown that a classical analog computer can be used to emulate a quantum computer, along with quantum superposition and entanglement, with the result that the fully classical system behaves like a true quantum computer.
http://phys.org/news/2015-05-quantum-emulated-classical.html
Quantum Physics Wed, 27 May 2015 09:30:03 EDTnews351916043Protocol corrects virtually all errors in quantum memory, but requires little measure of quantum statesQuantum computers are largely theoretical devices that could perform some computations exponentially faster than conventional computers can. Crucial to most designs for quantum computers is quantum error correction, which helps preserve the fragile quantum states on which quantum computation depends.
http://phys.org/news/2015-05-protocol-virtually-errors-quantum-memory.html
Quantum Physics Tue, 26 May 2015 09:00:35 EDTnews351849626New chip architecture may provide foundation for quantum computerQuantum computers are in theory capable of simulating the interactions of molecules at a level of detail far beyond the capabilities of even the largest supercomputers today. Such simulations could revolutionize chemistry, biology and material science, but the development of quantum computers has been limited by the ability to increase the number of quantum bits, or qubits, that encode, store and access large amounts of data.
http://phys.org/news/2015-05-chip-architecture-foundation-quantum.html
Quantum Physics Tue, 05 May 2015 11:00:03 EDTnews350040441Scientists achieve critical steps to building first practical quantum computerIBM scientists today unveiled two critical advances towards the realization of a practical quantum computer. For the first time, they showed the ability to detect and measure both kinds of quantum errors simultaneously, as well as demonstrated a new, square quantum bit circuit design that is the only physical architecture that could successfully scale to larger dimensions.
http://phys.org/news/2015-04-scientists-critical-quantum.html
Quantum Physics Wed, 29 Apr 2015 07:58:53 EDTnews349513075Researchers develop the first-ever quantum device that detects and corrects its own errorsWhen scientists develop a full quantum computer, the world of computing will undergo a revolution of sophistication, speed and energy efficiency that will make even our beefiest conventional machines seem like Stone Age clunkers by comparison.
http://phys.org/news/2015-03-first-ever-quantum-device-errors.html
Quantum Physics Wed, 04 Mar 2015 15:58:24 EDTnews344706897New largest number factored on a quantum device is 56,153(Phys.org)—Researchers have set a new record for the quantum factorization of the largest number to date, 56,153, smashing the previous record of 143 that was set in 2012. They have shown that the exact same room-temperature nuclear magnetic resonance (NMR) experiment used to factor 143 can actually factor an entire class of numbers, although this was not known until now. Because this computation, which is based on a minimization algorithm involving 4 qubits, does not require prior knowledge of the answer, it outperforms all implementations of Shor's algorithm to date, which do require prior knowledge of the answer. Expanding on this method, the researchers also theoretically show how the same minimization algorithm can be used to factor even larger numbers, such as 291,311, with only 6 qubits.
http://phys.org/news/2014-11-largest-factored-quantum-device.html
Quantum Physics Fri, 28 Nov 2014 12:31:23 EDTnews336400271Researchers find qubits based on trapped ions offer a promising scalable platform for quantum computing(Phys.org) —A team of researchers working at the University of Oxford has found that quantum bits (qubits) based on trapped calcium ions can be both manipulated and fashioned to store qubits with higher fidelity than any other method seen thus far. In their paper published in Physical Review Letters, the team describes how they built a means for testing the feasibility of using Ca+ ions as the basis for quantum computing and what they found in doing so.
http://phys.org/news/2014-11-qubits-based-ions-scalable-platform.html
Quantum Physics Wed, 26 Nov 2014 08:30:01 EDTnews336209367Simon's algorithm run on quantum computer for the first time—faster than on standard computer(Phys.org) —A team of researchers working in South Africa has reported that they've successfully run Simon's algorithm on a quantum computer for the first time. In their paper published in Physical Review Letters, the team describes how they ran the algorithm, the results they found and what doing so means for the future of quantum computing.
http://phys.org/news/2014-11-simon-algorithm-quantum-timefaster-standard.html
Quantum Physics Mon, 17 Nov 2014 10:17:20 EDTnews335441832A piece of the quantum puzzle: High level of controllability needed to explore ideas in quantum simulationsWhile the Martinis Lab at UC Santa Barbara has been focusing on quantum computation, former postdoctoral fellow Pedram Roushan and several colleagues have been exploring qubits (quantum bits) for quantum simulation on a smaller scale. Their research appears in the current edition of the journal Nature.
http://phys.org/news/2014-11-piece-quantum-puzzle-high-explore.html
Quantum Physics Wed, 12 Nov 2014 15:23:33 EDTnews335028182Flying qubits make for a highly resilient quantum memory(Phys.org) —In a quantum memory, the basic unit of data storage is the qubit. Because a qubit can exist in a superposition state of both "1" and "0" at the same time, it can process much more information than a classical bit. However, qubits are often very unstable due to decoherence, currently making them impractical for real-life memory storage.
http://phys.org/news/2014-10-qubits-highly-resilient-quantum-memory.html
Quantum Physics Fri, 31 Oct 2014 09:30:01 EDTnews333962722Physicists set new records for silicon quantum computingTwo research teams working in the same laboratories at UNSW Australia have found distinct solutions to a critical challenge that has held back the realisation of super powerful quantum computers.
http://phys.org/news/2014-10-physicists-silicon-quantum.html
Nanophysics Sun, 12 Oct 2014 13:00:09 EDTnews332308072Quantum environmentalism: Putting a qubit's surroundings to good useWhere are the quantum computers? Aren't they supposed to be speeding up decryption and internet searches? After two decades of research, you still can't find them in stores. Well, it took two decades or more of research dedicated to semiconductors and circuit integration before we had digital computers. For quantum computers too it will take technology more time to catch up to the science
http://phys.org/news/2014-10-quantum-environmentalism-qubit-good.html
Quantum Physics Thu, 02 Oct 2014 13:32:30 EDTnews331475380Putting the squeeze on quantum informationCanadian Institute for Advanced Research researchers have shown that information stored in quantum bits can be exponentially compressed without losing information. The achievement is an important proof of principle, and could be useful for efficient quantum communications and information storage.
http://phys.org/news/2014-09-quantum_1.html
Quantum Physics Thu, 25 Sep 2014 13:07:03 EDTnews330869214Early computer oscillator could become a core part of quantum computersAt the dawn of the era of solid-state electronics, a variety of promising technologies were competing to supplant the then-ubiquitous vacuum tube. The transistor quickly proved to be the fastest and most practical of these technologies. Yet as demonstrated by Zhirong Lin and Tsuyoshi Yamamoto from the RIKEN Center for Emergent Matter Science and their colleagues, one of the abandoned solid-state technologies, the parametric phase-locked oscillator (PPLO), could enjoy a revival as a core component of quantum computers.
http://phys.org/news/2014-08-early-oscillator-core-quantum.html
Quantum Physics Fri, 29 Aug 2014 07:59:13 EDTnews328517940Quantum meets classical: Qubit fabricated with integrated micromagnet increases speed of quantum manipulation in silicon(Phys.org) —The ubiquitous classical digital computer encodes data in bits (a portmanteau of binary and digits) in either a 0 or 1 state. On the other hand, while a quantum computer also uses 0/1 data representation, these qubits (from quantum and bits), qubit states 0 and 1 can be simultaneously in what is known as a superposition – and a quantum computer can also make use of entanglement. For these reasons, quantum computers can potentially solve problems whose complexity is too resource-intensive for classical computation. That being said, quantum computers are very difficult to construct. Recently, however, scientists at University of Wisconsin, Madison have fabricated a qubit in a silicon double-quantum dot in which the qubit basis states are the singlet state and the spin-zero triplet state of two electrons. (A double quantum dot links two quantum dots – semiconductor nanostructures that confine the motion of conduction band electrons, valence band holes, or excitons in all three spatial directions.) Moreover, the researchers have for the first time integrated a proximal micromagnet, allowing them to create a large local magnetic field difference between the two sides of the quantum dot - thereby greatly increasing their ability to manipulate the qubit without injecting noise that would induce superposition decoherence.
http://phys.org/news/2014-08-quantum-classical-qubit-fabricated-micromagnet.html
Quantum Physics Mon, 25 Aug 2014 09:30:02 EDTnews328158818Entanglement between particle and wave-like states of light resembles Schrodinger's cat experiment (Update)(Phys.org) —While entangling cats with atoms is not exactly an active area of research in any physics lab today (as far as anyone knows), many physicists are working on a close analogy of Schrödinger's cat experiment. That is, they are developing methods to entangle classical objects (analogous to the cat) with quantum particles (like an individual atom).
http://phys.org/news/2014-07-entanglement-particle-wave-like-states-resembles.html
Quantum Physics Tue, 15 Jul 2014 09:20:01 EDTnews324612175Ultra-thin wires for quantum computingTake a fine strand of silica fiber, attach it at each end to a slow-turning motor, gently torture it over an unflickering flame until it just about reaches its melting point and then pull it apart. The middle will thin out like a piece of taffy until it is less than half a micron across—about 200 times thinner than a human hair.
http://phys.org/news/2014-06-ultra-thin-wires-quantum.html
Quantum Physics Tue, 17 Jun 2014 11:31:40 EDTnews322223481Research team claims to have accurately 'teleported' quantum information ten feet(Phys.org) —A team of researchers at Delft University in the Netherlands is reporting in a paper they have had published in the journal Science, that they have successfully used entanglement as a means of communication, over a distance of ten feet (three meters). Furthermore, they note, they did so with 100 percent reliability and without altering the spin state of the quantum bits (qubits) involved.
http://phys.org/news/2014-05-team-accurately-teleported-quantum-ten.html
Quantum Physics Fri, 30 May 2014 06:55:34 EDTnews320651719Google engineers open gates to Quantum Computing PlaygroundDoes the idea of playing about with a quantum computer please you? If so, you can check out one fresh alternative route, thanks to a group of Google engineers. How about a GPU-accelerated quantum computer? You can take advantage of something called the Quantum Computing Playground which has launched as a browser-based WebGL Chrome Experiment. It features a GPU-accelerated quantum computer with a simple IDE interface. It has its own scripting language, with debugging and 3D quantum state visualization features.
http://phys.org/news/2014-05-google-gates-quantum-playground.html
Computer Sciences Fri, 23 May 2014 05:10:01 EDTnews320039329Superconducting qubit array points the way to error-free quantum computersA fully functional quantum computer is one of the holy grails of physics. Unlike conventional computers, the quantum version uses qubits (quantum bits), which make direct use of the multiple states of quantum phenomena. When realized, a quantum computer will be millions of times more powerful at certain computations than today's supercomputers.
http://phys.org/news/2014-04-superconducting-qubit-array-quantum.html
Quantum Physics Wed, 23 Apr 2014 14:51:27 EDTnews317483424Proposed modular quantum computer architecture offers scalability to large numbers of qubitsHow do you build a universal quantum computer? Turns out, this question was addressed by theoretical physicists about 15 years ago. The answer was laid out in a research paper and has become known as the DiVincenzo criteria. The prescription is pretty clear at a glance; yet in practice the physical implementation of a full-scale universal quantum computer remains an extraordinary challenge.
http://phys.org/news/2014-02-modular-quantum-architecture-scalability-large.html
Quantum Physics Thu, 27 Feb 2014 09:39:34 EDTnews312716358Scientists use 'voting' and 'penalties' to overcome errors in quantum optimizationSeeking a solution to decoherence—the "noise" that prevents quantum processors from functioning properly—scientists at USC have developed a strategy of linking quantum bits together into voting blocks, a strategy that significantly boosts their accuracy.
http://phys.org/news/2014-02-scientists-voting-penalties-errors-quantum.html
Quantum Physics Thu, 06 Feb 2014 13:29:08 EDTnews310915690Quantum physics could make secure, single-use computer memories possible(Phys.org) —Computer security systems may one day get a boost from quantum physics, as a result of recent research from the National Institute of Standards and Technology (NIST). Computer scientist Yi-Kai Liu has devised away to make a security device that has proved notoriously difficult to build—a "one-shot" memory unit, whose contents can be read only a single time.
http://phys.org/news/2014-01-quantum-physics-single-use-memories.html
Quantum Physics Wed, 15 Jan 2014 11:10:01 EDTnews309000767Research team's results make development of quantum computers more realisticTogether with a supporting research team, Kassel physicist Prof. Dr. Christiane Koch has made a discovery that is sure to attract significant attention among experts. Criteria established in the course of her research make the eventual development of the quantum computer more feasible.
http://phys.org/news/2013-12-team-results-quantum-realistic.html
Quantum Physics Thu, 12 Dec 2013 10:11:55 EDTnews306065499Physicists 'uncollapse' a partially collapsed qubit(Phys.org) —One of the striking features of a qubit is that, unlike a classical bit, it can be in two states at the same time. That is, until a measurement is made on the qubit, causing it to collapse into a single state. This measurement process and the resulting collapse may at first seem irreversible. (Once you open the box to find a dead cat, there's no going back, right?) But recently physicists have been investigating the possibility of "uncollapsing," or recovering the state of, a qubit that has been partially collapsed due to a weak measurement. The results could be used for implementing quality control in quantum systems.
http://phys.org/news/2013-11-physicists-uncollapse-partially-collapsed-qubit.html
Quantum Physics Mon, 11 Nov 2013 12:40:01 EDTnews303394100The power of one: Single photons illuminate quantum technologyQuantum mechanics, which aims to describe the nano-scale world around us, has already led to the development of many technologies ubiquitous in modern life, including broadband optical fibre communication and smartphone displays.
http://phys.org/news/2013-10-power-photons-illuminate-quantum-technology.html
Quantum Physics Fri, 11 Oct 2013 07:25:27 EDTnews300695028In quantum computing, light may lead the way(Phys.org) —Light might be able to play a bigger, more versatile role in the future of quantum computing, according to new research by Yale University scientists.
http://phys.org/news/2013-10-quantum.html
Quantum Physics Tue, 08 Oct 2013 06:33:42 EDTnews300432810Physics team suggests possible way to make quantum cryptography available in handheld machines(Phys.org) —A team of physicists at Bristol University in the U.K. has proposed a possible way to allow for quantum cryptography between a large station and a small hand held device. They describe such a technique in a paper they have uploaded to the preprint server arXiv.
http://phys.org/news/2013-08-physics-team-quantum-cryptography-handheld.html
Quantum Physics Fri, 30 Aug 2013 08:56:51 EDTnews297071795Quantum computing: Manipulating a single nuclear spin qubit of a laser cooled atomIt is advantageous to implement a quantum bit (qubit) with a single nuclear spin because the nuclear spin is robust against any stray magnetic fields. This robustness can be attributed to the small magnitude of the magnetic moment of the nuclear spin compared with that of the electronic spin.
http://phys.org/news/2013-08-quantum-nuclear-qubit-laser-cooled.html
Quantum Physics Tue, 27 Aug 2013 08:10:03 EDTnews296806611