Targeting individual atoms

24.06. 2019 Quantum Physics News

Nuclear magnetic resonance (NMR) spectroscopy is one of the most important methods of physicochemical analysis. It can be used to determine precise molecular structures and dynamics. The importance of this method is also evidenced by the recognition of ETH Zurich's two latest Nobel laureates, Richard Ernst and Kurt Wüthrich, for their contributions to refining the method.

How to bend waves to arrive at the right place

24.06. 2019 Quantum Physics News

Waves do not always spread uniformly into all directions, but can form a remarkable "branched flow." At TU Wien (Vienna) a method has now been developed to control this phenomenon.

How quantum technology could revolutionise the detection and treatment of diseases

24.06. 2019 Quantum Physics News

When you hear the word 'quantum," you may imagine physicists working on a new ground breaking theory. Or perhaps you've read about quantum computers and how they might change the world. But one lesser-known field is also starting to reap the benefits of the quantum realm—medicine.

Interaction-induced topology in symmetry-broken phase

21.06. 2019 Quantum Physics News

Symmetry is a fundamental characteristic in nature. Understanding the mechanisms that break symmetries is essential to scientific research. Spontaneous symmetry breaking (SSB), in particular, occurs when thermal or quantum fluctuations drive a system from a symmetric state into an ordered state, as it occurs when a liquid turns into a solid. This mechanism allows researchers to classify different phases of matter according to the different patterns generated by the broken symmetry.

Researchers make steps toward debugging tools for quantum computers

21.06. 2019 Quantum Physics News

In classical computing, debugging programs is one of the most time-consuming tasks in software development. Successful debugging relies on software development tools and also on the experience of the programmer. In quantum computing, researchers predict debugging will be an even greater challenge. In a paper soon to appear at the ACM/IEEE 46th Annual International Symposium for Computer Architecture (as part of ACM's 2019 Federated Computing Research Conferences), researchers at Princeton University present debugging tools based on statistical tests, with a goal of aiding programmers in building correct quantum programs for near-term quantum computers.

Researchers demonstrate new path to reliable quantum computation

21.06. 2019 Quantum Physics News

Researchers at the University of Chicago published a novel technique for improving the reliability of quantum computers by accessing higher energy levels than traditionally considered. Most prior work in quantum computation deals with "qubits," the quantum analogue of binary bits that encode either zero or one. The new work instead leverages "qutrits," quantum analogues of three-level trits capable of representing zero, one or two.

Research team supersizes ‘quantum squeezing’ to measure ultrasmall motion

20.06. 2019 Quantum Physics News

Physicists at the National Institute of Standards and Technology (NIST) have harnessed the phenomenon of "quantum squeezing" to amplify and measure trillionths-of-a-meter motions of a lone trapped magnesium ion (electrically charged atom).

Perfect quantum portal emerges at exotic interface

19.06. 2019 Quantum Physics News

Researchers at the University of Maryland have captured the most direct evidence to date of a quantum quirk that allows particles to tunnel through a barrier like it's not even there. The result, featured on the cover of the June 20, 2019 issue of the journal Nature, may enable engineers to design more uniform components for future quantum computers, quantum sensors and other devices.

A sound idea: A step towards quantum computing

19.06. 2019 Quantum Physics News

A team at the University of Tsukuba studied a novel process for creating coherent lattice waves inside silicon crystals using ultrashort laser pulses. Using theoretical calculations combined with experimental results that were obtained at the University of Pittsburgh, they were able to show that coherent vibrational signals could be maintained inside the samples. This research may lead to quantum computers based on existing silicon devices that can rapidly perform tasks out of the reach of even the fastest supercomputers now available.

Secure quantum communications in the microwave range for the first time

19.06. 2019 Quantum Physics News

Mikel Sanz, of the Physical Chemistry Department of UPV/EHU, leads the theoretical group for an experiment published by the prestigious journal, Nature Communications. The experiment has managed to prepare a remote quantum state; i.e., absolutely secure communication was established with another, physically separated quantum computer for the first time in the microwave regime. This new technology may bring about a revolution in the next few years.

Quantum music to my ears

18.06. 2019 Quantum Physics News

It sounds like an old-school vinyl record, but the distinctive crackle in the music streamed into Chris Holloway's laboratory is atomic in origin. The group at the National Institute for Standards and Technology, Boulder, Colorado, spent a long six years finding a way to directly measure electric fields using atoms, so who can blame them for then having a little fun with their new technology?

Study sheds light on gauge invariance in ultrastrong-coupling cavity quantum electrodynamics

18.06. 2019 Quantum Physics News

In quantum electrodynamics, the choice of gauge (i.e. specific mathematical formalism used to regulate degrees of freedom) can greatly influence the form of light-matter interactions. Interestingly, however, the "gauge invariance" principle implies that all physical results should be independent from a researcher's choice of gauge. The quantum Rabi model, which is often used to describe light-matter interactions in cavity-QED, has been found to violate this principle in the presence of ultrastrong light-matter coupling, and past studies have attributed this failure to the finite-level truncation of the matter system.

Quantum physics experiment shows Heisenberg was right about uncertainty, in a certain sense

17.06. 2019 Quantum Physics News

The word uncertainty is used a lot in quantum mechanics. One school of thought is that this means there's something out there in the world that we are uncertain about. But most physicists believe nature itself is uncertain.

Quantum simulation could help flights run on time

17.06. 2019 Quantum Physics News

A powerful new form of computing could help scientists design new types of materials for nanoelectronics, allow airlines to solve complex logistical problems to ensure flights run on time, and tackle traffic jams to keep cars flowing more freely on busy roads.

Oscillating quasiparticles: the cycle of decay and rebirth

14.06. 2019 Quantum Physics News

Decay is relentless in the macroscopic world: Broken objects do not fit themselves back together again. However, other laws are valid in the quantum world: New research shows that so-called quasiparticles can decay and reorganize themselves again and are thus become virtually immortal. These are good prospects for the development of durable data memories.