Blackbody radiation from a warm object attracts polarizable objects

08.12. 2017 Quantum Physics News

Our physical attraction to hot bodies is real, according to UC Berkeley physicists.

Physicists excited by discovery of new form of matter, excitonium

08.12. 2017 Quantum Physics News

Excitonium has a team of researchers at the University of Illinois at Urbana-Champaign... well... excited! Professor of Physics Peter Abbamonte and graduate students Anshul Kogar and Mindy Rak, with input from colleagues at Illinois, University of California, Berkeley, and University of Amsterdam, have proven the existence of this enigmatic new form of matter, which has perplexed scientists since it was first theorized almost 50 years ago.

Spontaneous Bose-Einstein condensation of excitons

08.12. 2017 Quantum Physics News

Excitons are pairs of electrons and holes inside a solid material that together behave like a single particle. It has long been suspected that when many such excitons exist in the same piece of matter, they can form a single giant quantum state called a Bose-Einstein condensate – the same process which is responsible for a metal losing all its electrical resistance when it becomes a superconductor, for example. However, actually proving that Bose-Einstein condensation of excitons occurs in any real material has been a challenge for physicists for decades. An experiment done at the University of Illinois at Urbana-Champaign, carried out in collaboration with UvA-Institute of Physics researcher Jasper van Wezel, has uncovered evidence that this elusive state of matter really does exist. Their results were published in Science this week.

Microcavity-engineered plasmonic resonances for strong light-matter interaction

06.12. 2017 Quantum Physics News

Achieving strong light-matter interaction at the quantum level has always been a central task in quantum physics since the emergence of quantum information and quantum control. However, the scale mismatch between the quantum emitters (nanometers) and photons (micrometers) makes the task challenging. Metallic nanostructures resolve the mismatch by squeezing the light into nanoscale volume, but their severe dissipations make quantum controls unlikely. Now, a group led by Xiao Yun-Feng at Peking University (China) has theoretically demonstrated that the strong light-matter interaction at quantum level can be achieved using microcavity-engineered metallic nanostructures. This result has been published in a recent issue of Physical Review Letters.

Experiment demonstrates quantum mechanical effects from biological systems

05.12. 2017 Quantum Physics News

Nearly 75 years ago, Nobel Prize-winning physicist Erwin Schrödinger wondered if the mysterious world of quantum mechanics played a role in biology. A recent finding by Northwestern University's Prem Kumar adds further evidence that the answer might be yes.

Toward a continuous atom laser

05.12. 2017 Quantum Physics News

Ever since its invention, the laser has been an invaluable tool in physics. It is expected that an atom laser - with the light waves replaced by the quantum waves of atoms - could have similarly important applications, for example in constructing ultra-precise clocks. A research team led by UvA researcher Florian Schreck has now made important progress towards the creation of the first continuous atom laser. The team's results were published in Physical Review Letters earlier this week.

Narrow glass threads synchronize the light emissions of distant atoms

05.12. 2017 Quantum Physics News

If you holler at someone across your yard, the sound travels on the bustling movement of air molecules. But over long distances your voice needs help to reach its destination—help provided by a telephone or the Internet. Atoms don't yell, but they can share information through light. And they also need help connecting over long distances.

Grasshopper problem yields insight into quantum theory

04.12. 2017 Quantum Physics News

(Phys.org)—Like many mathematical puzzles, the grasshopper problem is simple to state but difficult to solve: A grasshopper lands at a random point on a lawn of area 1, then jumps once, a fixed distance, in a random direction. What shape should the lawn be in order to maximize the chance that the grasshopper stays on the lawn after jumping?

Sustainable solvent platform for photon upconversion increases solar utilization efficiency

04.12. 2017 Quantum Physics News

The conversion of solar energy into electricity is currently restricted by a concept known as the Shockley-Quesser limit. This limitation allows only photons that have higher energies than those of the bandgap to be used, while those with lower energies are wasted. In an effort to obtain a solution to this problem and make solar energy conversion more efficient, researchers have developed a process of converting photons with lower energies into ones with higher energies, called photon upconversion.

Qubits put into reverse

01.12. 2017 Quantum Physics News

A group of scientists at the Niels Bohr Institute (NBI), University of Copenhagen, has figured out how to make spin qubits perform controlled backward rotations. This has never been shown before – and the journal Physical Review Letters, where the research has just been published, highlights the innovative discovery in the category "Editor's Suggestion."

Secure information transmission over 500m fiber links based on quantum technologies

01.12. 2017 Quantum Physics News

Quantum secret communication realizes secure information transmission-based on quantum principles. At present, the most developed quantum secret communication schemes are-based on quantum key distribution. In these schemes, the quantum function is limited to realize secret key generation and transmission, while the information transmission still depends on classical communication technologies.

Butterfly emerges from quantum simulation

30.11. 2017 Quantum Physics News

Quantum simulators, which are special-purpose quantum computers, will help researchers identify materials with new and useful properties. This enticing future has just taken a step forward thanks to a collaboration between Google and researchers at universities in California, Singapore and Greece.

Superconducting qubit 3-D integration prospects bolstered by new research

30.11. 2017 Quantum Physics News

Researchers from Google and the University of California Santa Barbara have taken an important step towards the goal of building a large-scale quantum computer.

Quantum simulators wield control over more than 50 qubits, setting new record

29.11. 2017 Quantum Physics News

Two independent teams of scientists, including one from the University of Maryland (UMD) and the National Institute of Standards and Technology (NIST), have used more than 50 interacting atomic qubits to mimic magnetic quantum matter, blowing past the complexity of previous demonstrations. The results appear in this week's issue of Nature.

Scientists demonstrate one of largest quantum simulators

29.11. 2017 Quantum Physics News

Physicists at MIT and Harvard University have demonstrated a new way to manipulate quantum bits of matter. In a paper published today in the journal Nature, they report using a system of finely tuned lasers to first trap and then tweak the interactions of 51 individual atoms, or quantum bits.