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A Quantum Low Pass for Photons

Physicists observe novel quantum effect that limits the number of emitted photons

19-Apr-2017

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called Poisson-distribution. There are, however, light sources with non-classical photon number distributions that can only be described by the ...

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Electric current at record speed

Scientists have generated the fastest electric current that has ever been measured inside a solid material

27-Oct-2016

In the field of electronics, the principle 'the smaller, the better' applies. Some building blocks of computers or mobile phones, however, have become nearly as small today as only a few atoms. It is therefore hardly possible to reduce them any further. Another factor for the performance of ...

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Correlated magnets made out of single atoms

Scientists observe antiferromagnetic correlations in one-dimensional fermionic quantum systems

04-Oct-2016

Solid state physics offers a rich variety of intriguing phenomena, several of which are not yet fully understood. Experiments with fermionic atoms in optical lattices get very close to imitating the behaviour of electrons in solid state crystals, thus forming a well-controlled quantum simulator ...

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Ultracold atoms in a "Rydberg-dress"

Scientists have developed a novel technique to let atoms interact over large distances

12-Aug-2016

Many properties of our everyday world can be explained if atoms are thought of as small, solid marbles, which feel each other only if brought in direct contact with each other. The temperature of the air surrounding us, for example, is the result of uncountable, continuously occurring collisions ...

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Mapping electromagnetic waveforms

Novel electron microscope can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second

26-Jul-2016

Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and it is difficult to capture them in action. However, a better understanding of the dynamics of field variation in electronic components, ...

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A signal boost for molecular microscopy

Cavity-enhanced Raman-scattering reveals information on structure and properties of carbon nanotubes

14-Jul-2016

Carbon nanotubes can be produced with a variety of shapes and properties and are therefore of much interest for widespread applications in fields as diverse as electronics, photonics, nanomechanics, and quantum optics. Hence it is important to have a tool at hand that allows to determine these ...

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Quantum matter without memory loss

MPQ scientists obtain evidence of many-body localization in a closed quantum system

08-Jul-2016

During equilibration ordinary many-body systems lose all information about the initial state. Every morning we experience an example for this behaviour. Milk poured into a cup of coffee mixes perfectly and after some time it is impossible to say how exactly the two fluids were put together. The ...

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One impurity to bind them all

Researchers show that a single atomic impurity is able to trap infinitely many bosons around it

06-Jun-2016

Nobody is perfect, but sometimes it is the defect that makes the difference. For example, the electric properties of semiconductors undergo significant changes by the slightest variation in the dopant concentration, and though a perfect diamond is without any colour, atomic impurities make them ...

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Attosecond camera for nanostructures

02-Jun-2016

Physicists of the Laboratory for Attosecond Physics at the Max Planck Institute of Quantum Optics and the Ludwig-Maximilians-Universität Munich in collaboration with scientists from the Friedrich-Alexander-Universität Erlangen-Nürnberg have observed a light-matter phenomenon in nano-optics, which ...

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The "great smoky dragon" of Quantum Physics

Physicists evaluated the quantum delayed-choice experiments for the first time

15-Mar-2016

Physicists around Anton Zeilinger have, for the first time, evaluated the almost 100-year long history of quantum delayed-choice experiments – from the theoretical beginnings with Albert Einstein to the latest research works in the present. Since the 17th century, science was intrigued by the ...

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