Unconventional superconductor may be used to create quantum computers of the future

19.02. 2018 Quantum Physics News

With their insensitivity to decoherence, Majorana particles could become stable building blocks of quantum computers. The problem is that they only occur under very special circumstances. Now, researchers at Chalmers University of Technology have succeeded in manufacturing a component that is able to host the sought-after particles.

Researchers demonstrate promising method for improving quantum information processing

16.02. 2018 Quantum Physics News

A team of researchers led by the Department of Energy's Oak Ridge National Laboratory has demonstrated a new method for splitting light beams into their frequency modes. The scientists can then choose the frequencies they want to work with and encode photons with quantum information. Their work could spur advancements in quantum information processing and distributed quantum computing.

Researchers demonstrate promising method for improving quantum information processing

16.02. 2018 Quantum Physics News

A team of researchers led by the Department of Energy's Oak Ridge National Laboratory has demonstrated a new method for splitting light beams into their frequency modes. The scientists can then choose the frequencies they want to work with and encode photons with quantum information. Their work could spur advancements in quantum information processing and distributed quantum computing.

Major discovery in controlling quantum states of single atoms

16.02. 2018 Quantum Physics News

Researchers at the Center for Quantum Nanoscience within the Institute for Basic Science (IBS) have made a major breakthrough in controlling the quantum properties of single atoms. In an international collaboration with IBM Research in San Jose, California, using advanced techniques, the scientists identified which mechanisms destroy the quantum properties of individual atoms by manipulating the magnetic state of a single iron atom on a thin insulator. Using a scanning tunneling microscope with an atomically sharp metal tip, they were able to image individual iron atoms and measure and control the time that they maintain their quantum behavior.

Major discovery in controlling quantum states of single atoms

16.02. 2018 Quantum Physics News

Researchers at the Center for Quantum Nanoscience within the Institute for Basic Science (IBS) have made a major breakthrough in controlling the quantum properties of single atoms. In an international collaboration with IBM Research in San Jose, California, using advanced techniques, the scientists identified which mechanisms destroy the quantum properties of individual atoms by manipulating the magnetic state of a single iron atom on a thin insulator. Using a scanning tunneling microscope with an atomically sharp metal tip, they were able to image individual iron atoms and measure and control the time that they maintain their quantum behavior.

New form of light: Newly observed optical state could enable quantum computing with photons

15.02. 2018 Quantum Physics News

Try a quick experiment: Take two flashlights into a dark room and shine them so that their light beams cross. Notice anything peculiar? The rather anticlimactic answer is, probably not. That's because the individual photons that make up light do not interact. Instead, they simply pass each other by, like indifferent spirits in the night.

Fingerprints of quantum entanglement

15.02. 2018 Quantum Physics News

Quantum entanglement is a key feature of quantum computing. Yet, how can researchers verify that a quantum computer actually incorporates large-scale entanglement? Conventional methods require a large number of repeated measurements, presenting research difficulties. Aleksandra Dimić from the University of Belgrade and Borivoje Dakić from the Austrian Academy of Sciences and the University of Vienna have developed a novel method for which even a single experimental run suffices to prove the presence of entanglement. Their results are published in the online open access journal npj Quantum Information.

Silicon qubits plus light add up to new quantum computing capability

14.02. 2018 Quantum Physics News

A silicon-based quantum computing device could be closer than ever due to a new experimental device that demonstrates the potential to use light as a messenger to connect quantum bits of information—known as qubits—that are not immediately adjacent to each other. The feat is a step toward making quantum computing devices from silicon, the same material used in today's smartphones and computers.

Stock market forces can be modeled with a quantum harmonic oscillator

14.02. 2018 Quantum Physics News

Traditionally, a quantum harmonic oscillator model is used to describe the tiny vibrations in a diatomic molecule, but the description is also universal in the sense that it can be extended to a variety of other situations in physics and beyond. One example of this is illustrated in a new study, in which researchers show that the restoring force in a vibrating quantum harmonic oscillator provides a good approximation of the market force that restores a fluctuating stock return to equilibrium.

Physicists extend stochastic thermodynamics deeper into quantum territory

13.02. 2018 Quantum Physics News

Physicists have extended one of the most prominent fluctuation theorems of classical stochastic thermodynamics, the Jarzynski equality, to quantum field theory. As quantum field theory is considered to be the most fundamental theory in physics, the results allow the knowledge of stochastic thermodynamics to be applied, for the first time, across the full range of energy and length scales.

New hole-punched crystal clears a path for quantum light

13.02. 2018 Quantum Physics News

Optical highways for light are at the heart of modern communications. But when it comes to guiding individual blips of light called photons, reliable transit is far less common. Now, a collaboration of researchers from the Joint Quantum Institute (JQI), led by JQI Fellows Mohammad Hafezi and Edo Waks, has created a photonic chip that both generates single photons, and steers them around. The device, described in the Feb. 9 issue of Science, features a way for the quantum light to seamlessly move, unaffected by certain obstacles.

Routing photons with a topological photonic structure

12.02. 2018 Quantum Physics News

A team of researchers at the University of Maryland has found a new way to route photons at the micrometer scale without scattering by building a topological quantum optics interface. In their paper published in the journal Science, the group describes their topological photonic structure, how it works, and the ways they tested it. Alberto Amo with Université de Lill in Spain offers a short history of recent attempts to route photons at such a tiny scale and also outlines the work done by the team at UM.

The benefits of quantum effects for biological, social and technological networks

12.02. 2018 Quantum Physics News

Efficiency in nature's biomolecular processes, such as photosynthesis, is not wholly explained by conventional theory. The EU-funded PAPETS project explored quantum effects to better understand these processes, recently leading to further insights into the possibilities for quantum computation.

Forging a quantum leap in quantum communication

09.02. 2018 Quantum Physics News

Quantum communication, which ensures absolute data security, is one of the most advanced branches of the "second quantum revolution". In quantum communication, the participating parties can detect any attempt at eavesdropping by resorting to the fundamental principle of quantum mechanics - a measurement affects the measured quantity. Thus, the mere existence of an eavesdropper can be detected by identifying the traces that his measurements of the communication channel leave behind.

New silicon chip for helping build quantum computers and securing our information

09.02. 2018 Quantum Physics News

Researchers at the University of Bristol's Quantum Engineering Technology Labs have demonstrated a new type of silicon chip that can help building and testing quantum computers and could find their way into your mobile phone to secure information.