Tag Archives | Physics
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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New Records Set for Silicon Quantum Computing

New Records Set for Silicon Quantum Computing

Two 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.   The teams created two types of quantum bits, or “qubits” — the building blocks for quantum computers — that each process quantum data with [...]

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Electronics That Need Very Little Energy?

Electronics That Need Very Little Energy?

A team of researchers has discovered a way to cool electrons to -228 °C without external means and at room temperature, an advancement that could enable electronic devices to function with very little energy.   A chip, which contains nanoscale structures that enable electron cooling at room temperature, is pictured. The process involves passing electrons [...]

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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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Laser Pulse Turns Glass Into a Metal

Laser Pulse Turns Glass Into a Metal

For tiny fractions of a second, quartz glass can take on metallic properties, when it is illuminated be a laser pulse. This has been shown by calculations at the Vienna University of Technology. The effect could be used to build logical switches which are much faster than today’s microelectronics. Quartz glass does not conduct electric [...]

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Laser Makes Microscopes Far More Sensitive

Laser Makes Microscopes Far More Sensitive

Laser physicists have found a way to make atomic-force microscope probes 20 times more sensitive and capable of detecting forces as small as the weight of an individual virus.   The technique, developed by researchers at The Australian National University (ANU), hinges on using laser beams to cool a nanowire probe to minus 265 degrees [...]

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A Transistor-Like Amplifier for Single Photons

A Transistor-Like Amplifier for Single Photons

Data transmission over long distances usually utilizes optical techniques via glass fibres — this ensures high speed transmission combined with low power dissipation of the signal. For quite some years possibilities have been explored how to go one step further and perform all-optical data processing, with optical transistors and optical logic gates. In particular in [...]

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