Lifeboat Foundation

Researchers from the Graphene Flagship use layered materials to create an all-electrical quantum light emitting diodes (LED) with single-photon emission. These LEDs have potential as on-chip photon sources in quantum information applications.

Atomically thin LEDs emitting one photon at a time have been developed by researchers from the Graphene Flagship. Constructed of layers of atomically thin materials, including transition metal dichalcogenides (TMDs), graphene, and boron nitride, the ultra-thin LEDs showing all-electrical single photon generation could be excellent on-chip quantum light sources for a wide range of photonics applications for quantum communications and networks. The research, reported in Nature Communications, was led by the University of Cambridge, UK.

The ultra-thin devices reported in the paper are constructed of thin layers of different layered materials, stacked together to form a heterostructure. Electrical current is injected into the device, tunnelling from single-layer graphene, through few-layer boron nitride acting as a tunnel barrier, and into the mono- or bi-layer TMD material, such as tungsten diselenide (WSe2), where electrons recombine with holes to emit single photons. At high currents, this recombination occurs across the whole surface of the device, while at low currents, the quantum behaviour is apparent and the recombination is concentrated in highly localised quantum emitters.

Quantum Goddess

Can the University of New South Wales researcher propel Australia first over the finish line in the race to build a reliable quantum computer? Elizabeth Finkel reports.

Why do we remember the past, but not the future? It seems like a silly question, but for some scientists, it’s a deep mystery wrapped up in physics and perception.

The mystery takes another twist in a study appearing in the same journal that published Albert Einstein’s theories of relativity more than a century ago.

Researchers from the University of Calgary demonstrated that photons’ states could be teleported at a record 6 kilometer distance over “dark fiber.” The team hopes this research could help them establish the fundamentals for a “global quantum internet.”

This is the question tackled by theoretical physicists working on quantum gravity by creating models attempting to reconcile gravity and quantum mechanics.

Some of these models predict that spacetime at the Planck scale (10^-33cm) is no longer continuous — as held by classical physics — but discrete in nature.

Just like the solids or fluids we come into contact with every day, which can be seen as made up of atoms and molecules when observed at sufficient resolution. A structure of this kind generally implies, at very high energies, violations of Einstein’s special relativity (a integral part of general relativity).

Satellite, named after ancient philosopher Micius, launched in August with a mission to establish a secure communications between China and Europe.

PUBLISHED : Saturday, 24 September, 2016, 11:47pm.

UPDATED : Saturday, 24 September, 2016, 11:48pm.

Continue reading “China’s orbiting quantum satellite links with ground stations” »

Quantum encryption uses the principle of “quantum entanglement” to foster communication that’s totally safe against eavesdropping and decryption by others.

The satellite’s true military nature is being disguised under the civilian name, Quantum Experiments at Space Scale, or QUESS. Publicly, QUESS is being billed as an international research project in the field of quantum physics.

Micius or Mozi is operated by the Chinese Academy of Sciences (CAS) while the University of Vienna and the Austrian Academy of Sciences run the satellite’s European receiving stations. The quantum satellite was launched last Aug. 16 from the Jiuquan Satellite Launch Center in the Gobi Desert.

Continue reading “China’s Micius Military Quantum Satellite Reports Important Progress” »

The paradox of Schrödinger’s cat—in which a quantum cat is both alive and dead at the same time until we check to see which state it’s in—is arguably the most famous example of the bizarre counter-intuitive nature of the quantum world. Now, Stanford physicists have exploited this feature weirdness to make highly detailed movies of the inner machinery of simple iodine molecules.

They forgot ORNL in the laboratory list.

Deals to three companies — D-Wave, Cambridge Quantum Computing, and Quantum Biosystems — dominate funding. But newer players are emerging.