Tag Archives | Quantum Computers

Analogue Quantum Computers: Still Wishful Thinking?

Many challenges lie ahead before quantum annealing, the analogue version of quantum computation, contributes to solve combinatorial optimization problems Traditional computational tools are simply not powerful enough to solve some complex optimization problems, like, for example, protein folding. Quantum annealing, a potentially successful implementation of analogue quantum computing, would bring about an ultra-performant computational method. […]

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Quantum Computing: Rice-Sized Laser Power

Quantum Computing: Rice-Sized Laser Power

Princeton University researchers have built a rice grain-sized laser powered by single electrons tunneling through artificial atoms known as quantum dots. The tiny microwave laser, or “maser,” is a demonstration of the fundamental interactions between light and moving electrons.   The researchers built the device — which uses about one-billionth the electric current needed to […]

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Improved Interface for a Quantum Internet

Improved Interface for a Quantum Internet

A quantum network requires efficient interfaces over which information can be transferred from matter to light and back. In the current issue of Physical Review Letters, Innsbruck physicists led by Rainer Blatt and Tracy Northup show how this information transfer can be optimized by taking advantage of a collective quantum phenomenon.   Quantum computers are […]

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Quantum Optical Hard Drive Breakthrough

Quantum Optical Hard Drive Breakthrough

Scientists developing a prototype quantum hard drive have improved storage time by a factor of more than 100.   The team’s record storage time of six hours is a major step towards a secure worldwide data encryption network based on quantum information, which could be used for banking transactions and personal emails. “We believe it […]

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Half-Light Half-Matter Quantum Particles

Prospects of developing computing and communication technologies based on quantum properties of light and matter may have taken a major step forward thanks to research by City College of New York physicists led by Dr. Vinod Menon. In a pioneering study, Professor Menon and his team were able to discover half-light, half-matter particles in atomically […]

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A Qubit Candidate Shines Brighter

A Qubit Candidate Shines Brighter

In the race to design the world’s first universal quantum computer, a special kind of diamond defect called a nitrogen vacancy (NV) center is playing a big role. NV centers consist of a nitrogen atom and a vacant site that together replace two adjacent carbon atoms in diamond crystal. The defects can record or store […]

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Possible Read Head for Quantum Computers

Possible Read Head for Quantum Computers

Nitrogen-vacancy centers in diamonds could be used to construct vital components for quantum computers. But hitherto it has been impossible to read optically written information from such systems electronically. Using a graphene layer, a team of scientists headed by Professor Alexander Holleitner of the Technische Universität München (TUM) has now implemented just such a read […]

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Graphene: When a Doughnut Becomes an Apple

Graphene: When a Doughnut Becomes an Apple

In experiments using the wonder material graphene, ETH researchers have been able to demonstrate a phenomenon predicted by a Russian physicist more than 50 years ago. They analysed a layer structure that experts believe may hold unimagined promise.   Anastasia Varlet works as a doctoral candidate in the research group headed by ETH Professor Klaus […]

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Quantum Info Transmitted Through Atmosphere

Quantum Info Transmitted Through Atmosphere

It could be difficult for the NSA to hack encrypted messages in the future — at least if a technology being investigated by scientists at the Max Planck Institute for the Science of Light in Erlangen and the University Erlangen-Nürnberg is successful: quantum cryptography. The physicists are now laying the foundation to make this technique, […]

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Light Sources for New Quantum Technology

Light Sources for New Quantum Technology

Electronic circuits are based on electrons, but one of the most promising technologies for future quantum circuits are photonic circuits, i.e. circuits based on light (photons) instead of electrons. First, it is necessary to be able to create a stream of single photons and control their direction. Researchers around the world have made all sorts […]

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