Category: Quantum

Quantum race accelerates development of silicon quantum chip

The worldwide race to create more, better and reliable quantum processors is progressing fast, as a team of TU Delft scientists led by Professor Vandersypen has realised yet again. In a neck-and-neck race with their competitors, they showed that quantum information of an electron spin can be transported to a photon, in a silicon quantum chip. This is important in order to connect quantum bits across the chip and allowing to scale up to large numbers of qubits. Their work was published today in the journal Science.

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Developing a secure, un-hackable net

UCL Home UCL News Developing a secure, un-hackable net
Developing a secure, un-hackable net
11 January 2018

A method of securely communicating between multiple quantum devices has been developed by a UCL-led team of scientists, bringing forward the reality of a large-scale, un-hackable quantum network.

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Quantum coupling

Tübingen University physicists are the first to link atoms and superconductors in key step towards new hardware for quantum computers and Networks.

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Stable quantum bits

Milestone on the path to the quantum computer: Scientists of the University of Konstanz, Princeton University, and the University of Maryland develop a stable quantum gate for two-quantum bit systems made of silicon. The quantum gate is able to perform all necessary basic operations of the quantum computer. The electron spin of individual electrons in silicon is used as the basic storage unit (“quantum bits”).

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Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network. Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor Gerhard Rempe at the Max Planck Institute of Quantum Optics have now achieved a major breakthrough: they demonstrated the long-lived storage of a photonic qubit on a single atom trapped in an optical resonator.

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Essential quantum computer component downsized by two orders of magnitude

Researchers at IST Austria have built compact photon directional devices. Their micrometer-scale, nonmagnetic devices route microwave photons and can shield qubits from harmful noise. Qubits, or quantum bits, are the key building blocks that lie at the heart of every quantum computer. In order to perform a computation, signals need to be directed to and from qubits.

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New quantum materials offer novel route to 3D electronic devices

Researchers have shown how the principles of general relativity open the door to novel electronic applications such as a three-dimensional electron lens and electronic invisibility devices. In a new study funded by the Academy of Finland, Aalto University researchers Alex Westström and Teemu Ojanen propose a method to go beyond special relativity and simulate Einstein’s theory of general relativity in inhomogeneous Weyl semimetals.

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Finding Majoranas

Nano-‘hashtags’ could be the key to generating the highly sought Majorana quasiparticle. UC Santa Barbara scientists are on the cusp of a major advance in topological quantum computing. In a paper that appears in the journal Nature, Chris Palmstrøm, a UCSB professor of electrical and computer engineering and of materials, and colleagues describe a method by which “hashtag”– shaped nanowires may be coaxed to generate Majorana quasiparticles.

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Quantum Computing with Molecules for a Quicker Search of Unsorted Databases

Grover’s Quantum Algorithm Successfully Implemented – Superposition Manipulated and Read out Electrically – Publication in Physical Review Letters. Scrapbooks or social networks are collections of mostly unsorted data. The search for single elements in very large data volumes, i.e. for the needle in the data haystack, is extremely complex for classical computers. Scientists of Karlsruhe Institute of Technology (KIT) have now quantum mechanically implemented and successfully executed Glover’s algorithm, a process for the quick finding of a search element in unsorted databases.

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Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories.

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Quantum computing on the move

Decisive milestone for scaling up quantum computers. A future quantum computer, using “quantum bits” or qubits, might be able to solve problems which are not tractable for classical computers. Scientists are currently struggling to build devices with more than a few qubits, with the challenge arising that the qubits mutually hamper each other’s proper operation.

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Nanomagnets Levitate Thanks to Quantum Physics

Quantum physicists in Oriol Romero-Isart’s research group in Innsbruck show in two current publications that, despite Earnshaw’s theorem, nanomagnets can be stably levitated in an external static magnetic field owing to quantum mechanical principles. The quantum angular momentum of electrons, which also causes magnetism, is accountable for this mechanism.

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