EurekAlert May 20, 2020 Architectures for photonic quantum computing place stringent demands on high quality information carriers. An international team of researchers (UK, Italy) has fabricated on-chip photon sources and demonstrated that they meet the computing requirements. The photon sources are fabricated in silicon using mature processes and exploit a dual-mode pump-delayed excitation scheme to engineer the emission of spectrally pure photon pairs through inter-modal spontaneous four-wave mixing in low-loss spiraled multi-mode waveguides. They measured a spectral purity of 0.9904 ± 0.0006, a mutual indistinguishability of 0.987 ± 0.002, and >90% intrinsic heralding efficiency and on-chip quantum interference with a visibility of 0.96 ± 0.02 between […]
Tag Archives: Quantum technologies
Unlocking promising properties to create future technologies
EurekAlert April 30, 2020 The manifestation of quantization in macroscopic physical systems has showcased important quantum phenomena, such as quantized conductance in (fractional) quantum Hall effects and quantized vortices in superconductors. An international team of researchers (USA – Rensselaer Polytechnic Institute, Florida State University, UT Dallas, Arizona State University, Japan, Hong Kong) reported the experimental observation of quantized exciton energies in a macroscopic system with strong Coulomb interaction, monolayer WSe2 crystal under a strong magnetic field. This work demonstrates the optical version of the QHE for excitons, and the researchers believe it will open the door for further discovery and […]
Scientists discover first antiferromagnetic topological quantum material
Science Daily December 19, 2019 An international team of researchers led by Spain has developed a crystal growing technique for intrinsically magnetic topological material manganese-bismuth telluride (MnBi2Te4) and characterized the physical properties of the crystals. The team was able to prove both in theory and in spectroscopic experiments that MnBi2Te4 is the first antiferromagnetic topological insulator (AFMTI) below its Néel temperature. They optimized the synthesis protocol for the new material so that MnBi2Te4 single crystals can be produced more easily. Recent findings show that there are even more structural derivatives of MnBi2Te4, which are relevant in the context of MTI…read […]
Nanooptical traps: A promising building block for quantum technologies
Phys.org November 19, 2019 By controlling individual atoms, quantum properties can be investigated and made usable for technological applications. However, the applicability of this technology has been limited because the atoms become very hot after a very short time and are lost. An international team of researchers (Austria, Germany) has carefully analyzed the system. With their theoretical model, they were able to show that a certain form of mechanical vibration of the glass fiber is responsible for the strong heating of the particles. This finding has important consequences for applications. The technology can be significantly improved with simple countermeasures, longer […]
Quantum Technologies Flagship kicks off with first 20 projects
Europa.eu October 29, 2018 The Flagship will fund over 5,000 of Europe’s leading quantum technologies researchers over the next ten years and aims to place Europe at the forefront of the second quantum revolution. Its long-term vision is to develop in Europe a so-called quantum web, where quantum computers, simulators and sensors are interconnected via quantum communication networks. The Flagship will initially fund 20 projects , with a total of €132 million via the Horizon 2020 programme , and from 2021 onwards it is expected to fund a further 130 projects. Its total budget is expected to reach €1 billion, providing […]
The quantum technologies roadmap: a European community view
New Journal of Physics August 1, 2018 In 2016 EU created a 150-page QT Roadmap . This article presents an updated summary of the roadmap. Software, protocols, and quantum information theory are essential for an optimal development of QT. Until now, most of the effort has focused on identifying the ultimate limits for quantum information processing. In the next 5–10 years, a parallel effort will be devoted to understanding what can be done with the first generations of small quantum processors, identifying for instance quantum computation protocols whose classical simulation is infeasible or realisation of protocols with unprecedented levels of security. […]