Quantum Journal

Extensible universal photonic quantum computing with nonlinearity

IBM and Ecosystem Partners Demonstrate “Trusted Quantum Advantage” Beyond Classical Supercomputers

IBM and a coalition of research collaborators—including the University of Chicago, Qedma Quantum Computing, Algorithmiq, RIKEN, and BlueQubit—have announced three joint technical demonstrations of quantum advantage. Published alongside public circuit repositories on the Quantum Advantage Tracker, the studies report that IBM's cloud-accessible quantum hardware ran complex, utility-scale algorithms beyond the computational capacity of leading classical [...] The post IBM and Ecosystem Partners...

Quantum spin effects may enhance one-way electrical transport in chiral magnets

Quantum fluctuations influence direction-dependent electrical transport in chiral magnets, researchers from Science Tokyo report. In chiral magnetic systems, electric current flows differently depending on its direction, but the role of quantum effects in this behavior has remained unclear. Through theoretical analysis, the researchers showed that chiral magnetic systems exhibit logarithmic temperature dependence at low temperatures, offering new insights into electron transport in magnetic m...

Cesium atoms and quantum dots generate indistinguishable photons for modular quantum networks

Large-scale quantum communication networks require both reliable quantum memories and coherent single-photon sources that can exchange quantum information efficiently. A coherent source of single photons with narrow linewidth, high brightness, spectral uniformity and compatibility with quantum memories is necessary. While a variety of single-photon sources, such as quantum dots (QDs) and atoms in warm vapor cells, have been developed in recent years, each has inherent limitations, making a sc...