Quantum-Dot Device Can Generate Multiple Frequency-Entangled Photons
Researchers at Telecom Paris unveiled a shaping frequency entangling gate (FrEnGATE) that uses a quantum‑dot embedded waveguide to generate multiple frequency‑entangled photons. The device operates in the 1550 nm telecom band and can repeatedly entangle photons without post‑generation filtering. Numerical simulations predict a 15 % success probability per attempt, far surpassing traditional nonlinear‑crystal methods. The approach promises scalable on‑chip production of high‑dimensional qudit states for quantum communication and computing.
Scientists Realize a Three-Qubit Quantum Register in a Silicon Photonic Chip
UC Berkeley researchers have realized a three‑qubit quantum register on a silicon photonic chip using atomic‑scale T‑centers. The device achieves coherent control and entanglement with nuclear‑spin coherence times up to roughly 100 ms. The register is integrated via ion implantation, rapid...
A New Valve for Quantum Matter: Steering Chiral Fermions by Geometry Alone
A team led by Stuart Parkin and Claudia Felser has demonstrated a chiral fermionic valve that separates particles of opposite handedness using only quantum geometry, without magnetic fields. The device is built from high‑quality PdGa topological semimetal crystals micro‑structured into a three‑arm...
An Ultra-Fast Quantum Tunneling Device for the 6G Terahertz Era
A UNIST‑Ajou research team has created a terahertz quantum tunneling device that operates at dramatically lower electric fields, using titanium dioxide instead of aluminum oxide. The new TiO₂‑based nanogap device tunnels reliably at about 0.75 V nm⁻¹, roughly one‑quarter of the field...
Quantum Phenomenon Enables a Nanoscale Mirror that Can Be Switched on and Off
Physicists at the University of Amsterdam have created a nanoscale mirror that can be electrically switched on and off using a monolayer of tungsten disulfide (WS₂) integrated into a hybrid 2D excitonic metasurface. The device exploits strong light‑matter coupling and...
Replication Efforts Suggest 'Smoking Gun' Evidence Isn't Enough to Prove Quantum Computing Claims
A multinational team led by University of Pittsburgh physicist Sergey Frolov conducted multiple replication studies on topological signatures claimed to demonstrate breakthroughs in quantum computing. Each attempt uncovered alternative, non‑topological explanations for the dramatic "smoking‑gun" patterns reported in high‑profile journals....
Unexpected Oscillation States in Magnetic Vortices Could Enable Coupling Across Different Physical Systems
Researchers at Helmholtz‑Zentrum Dresden‑Rossendorf have observed self‑induced Floquet states in magnetic vortices using only microwatt‑level magnetic wave excitation. The phenomenon manifests as a magnon frequency comb, a series of evenly spaced spectral lines, arising from a subtle circular motion of...
Entanglement Enhances the Speed of Quantum Simulations, Transforming Long-Standing Obstacles Into a Powerful Advantage
Researchers at the University of Hong Kong have demonstrated that quantum entanglement, long seen as a barrier for classical simulations, actually accelerates quantum simulations. Published in Nature Physics, the study shows that higher entanglement improves algorithmic efficiency on quantum hardware....
New Evidence for a Particle System that 'Remembers' Its Previous Quantum States
Researchers at the Weizmann Institute have presented new evidence that bilayer graphene hosts non‑Abelian anyons, exotic quasiparticles that retain a memory of their exchange history. By guiding an anyon around a magnetic island and measuring interference‑derived resistance oscillations, they detected...
New Framework Unifies Space and Time in Quantum Systems
Physicists Seok Hyung Lie and James Fullwood introduced a theoretical framework that unifies spatial and temporal quantum descriptions into a single multipartite quantum state over time. By assuming linearity of the initial state and a quantum version of conditional probability, they...
Metal–Metal Bonded Molecule Achieves Stable Spin Qubit State, Opening Path Toward Quantum Computing Materials
Researchers at Kumamoto University and partners have shown that the cobalt‑based molecule Co₃(dpa)₄Cl₂, featuring direct metal‑metal bonds, can function as a stable spin qubit. Advanced magnetic measurements and pulsed EPR revealed slow magnetic relaxation and coherent Rabi oscillations, indicating long‑lived...
Fault-Tolerant Quantum Computing: Novel Protocol Efficiently Reduces Resource Cost
Researchers at the University of Tokyo and Nanofiber Quantum Technologies have unveiled a hybrid fault‑tolerant quantum computing protocol that simultaneously reduces space and time overhead. By pairing quantum low‑density parity‑check (QLDPC) codes with concatenated Steane codes, the scheme achieves constant...
