Science Daily August 22, 2019 An international team of researchers (Austria, USA – Rice University, University of Florida, Germany) investigated a material made of palladium, silicon and cerium focusing on the electrons located at the cerium atom and on the conduction electrons, which can move freely through the crystal. The conduction electrons can virtually hide both the spin and the orbital state of the fixed electrons. This means that order is no longer possible. They have developed a system in which the order can be switched on and off individually in relation to two different degrees of freedom that are […]
Category Archives: Quantum technology
Quantum light sources pave the way for optical circuits
Science Daily August 1, 2019 The ability to tailor quantum emitters via site-selective defect engineering is essential for realizing scalable architectures. However, a major difficulty is that defects need to be controllably positioned within the material. An international team of researchers (Germany, USA – SUNY Buffalo, Japan) has overcome this challenge by controllably irradiating monolayer MoS2 using a sub-nm focused helium ion beam to deterministically create defects. Subsequent encapsulation of the ion exposed MoS2 flake with high-quality hBN reveals spectrally narrow emission lines that produce photons in the visible spectral range. The new method allows for a multitude of applications in […]
Physicists find first possible 3-D quantum spin liquid
Phys.org July 15, 2019 A quantum spin liquid is a state of matter where unpaired electrons’ spins, although entangled, do not show magnetic order even at the zero temperature. An international team of researchers (USA – Rice University, UC San Diego, Oak Ridge National Laboratory, Rutgers University, industry, UK, Switzerland, South Korea, University of Hong Kong) used thermodynamic, muon spin relaxation and neutron scattering experiments on single crystals of Ce2Zr2O7 to demonstrate the absence of magnetic ordering and the presence of a spin excitation continuum at 35 mK. With no evidence of oxygen deficiency and magnetic/non-magnetic ion disorder seen by neutron […]
‘Connecting the dots’ for quantum networks
Science Daily July 9, 2019 For quantum dots to “communicate”, they must emit light at the same wavelength. The size of a quantum dot determines this emission wavelength. Instead of making quantum dots perfectly identical to begin with, researchers at the US Naval Research Laboratory change their wavelength afterwards by shrink-wrapping them with laser-crystallized hafnium oxide, squeezing the quantum dots, which shifts their wavelength in a very controllable way. Doing this for many quantum dots in an integrated circuit, could be used for optical, rather than electrical computing. The technique could accelerate the development of quantum information technologies and brain-inspired […]
Researchers create a ‘universal entangler’ for new quantum tech
Phys.org February 27, 2019 Using an entangling mechanism called an exponential-SWAP gate researchers at Yale University demonstrated the new technology by deterministically entangling encoded states in any chosen configuration or codes, each housed in two otherwise isolated, 3-D superconducting microwave cavities. The results provide a valuable building block for universal quantum computation using bosonic modes…read more. TECHNICAL ARTICLE
Quantum predictions
Phys.org November 2, 2018 To more fully understand and harness properties of complex materials such as vanadium dioxide a team of researchers in the US (Oak Ridge National Laboratory, Argonne National Laboratory, Sandia National Laboratories, Lawrence Livermore National Laboratory, the University of California, Berkeley, North Carolina State University) is using the Quantum Monte Carlo method which accounts for the individual behavior of all of the electrons without major approximations, reducing systematic errors in simulations and producing reliable results. The team has built open-source software, known as QMCPACK, that is now available online and on all the DOE Office of Science […]