Phys.org April 15, 2024 Conventional design approaches are typically limited to a single magnetic origin, which can restrict the number of correlated spins or the type of magnetic ordering in open shell nanographenes. An international team of researchers (Singapore, Czech Republic) developed a design strategy that combined topological frustration and electron–electron interactions to fabricate a large fully fused ‘butterfly’-shaped tetraradical nanographene on Au(111). They resolved the molecular backbone and revealed the strongly correlated open-shell character. The nanographene contained four unpaired electrons with both ferromagnetic and anti-ferromagnetic interactions, harbouring a many-body singlet ground state and strong multi-spin entanglement. They studied the […]
Category Archives: Information technology
Exploring quantum correlations of classical light source for image transmission
Phys.org August 31, 2021 Researchers in China formulated a density matrix to fully describe two-photon state within a thermal light source in the photon orbital angular momentum (OAM) Hilbert space. They proved the separability, i.e., zero entanglement of the thermal two-photon state. Still, they revealed the hidden quantum correlations in terms of geometric measures of discord. By mimicking the original protocol of quantum teleportation, they demonstrated that the non-zero quantum discord can be utilized to transmit a high-dimensional OAM state at the single-photon level. It was found that the information of all parameters that characterize the original state can still […]
Storing information in antiferromagnetic materials
EurekAlert August 24, 2020 An international team of researchers (Germany, France, Japan, Czech Republic) has shown that information storage in antiferromagnetic materials is fundamentally possible, and how efficiently information can be written electrically in insulating antiferromagnetic materials. For their measurements, the researchers used the antiferromagnetic insulator Cobalt oxide CoO – a model material that paves the way for applications. The result: Currents are much more efficient than magnetic fields to manipulate antiferromagnetic materials. This discovery opens the way toward applications ranging from smart cards that cannot be erased by external magnetic fields to ultrafast computers – thanks to the superior […]
Physicists’ finding could revolutionize information transmission
Phys.org July 9, 2019 An international team of researchers (USA – UC Riverside, National High Magnetic Field Laboratory, State University of Florida, Japan) has observed, characterized, and controlled dark trions in tungsten diselenide. Because a trion contains three interacting particles, controllable spin and momentum indices and a rich internal structure, it can carry much more information than a single electron. The lifetime of dark trions is more than 100 times longer than the more common bright trions. The long lifetime enables information transmission by trions over a much longer distance. They demonstrated continuous tuning from positive dark trions to negative […]
Researchers develop nanoparticle films for high-density data storage
Nanowerk April 3, 2018 Films made of the semiconductor titania and silver nanoparticles are promising for holographic data storage. But exposure to UV light has been shown to erase the data, making the films unstable for long-term information storage. Researchers in China used electron-accepting molecules that measured 1 to 2 nanometers to disrupt the electron flow from the semiconductor to the metal nanoparticles. They fabricated semiconductor films with a honeycomb nanopore structure that allowed the nanoparticles, electron-accepting molecules and the semiconductor to all interface with each other. In tests holograms could be written into them efficiently and with high stability […]