1+ hour, 41+ min ago  (964+ words) Horizon Quantum will acquire a 256-qubit trapped-ion system from Ion Q, advancing its work to unlock the potential of quantum computing and broaden access to quantum advantage. The system, featuring 99. 99% gate fidelity and all-to-all connectivity, will expand Horizon Quantum's hardware…...

2+ hour, 3+ min ago  (882+ words) Previously, improvements to quantum coherence have arrived alongside simultaneous changes to a qubit's materials and design, obscuring which adjustments actually work. Now, a new framework disentangles these factors, specifying five distinct loss pathways and a pre-committed experimental protocol for verifying…...

2+ hour, 4+ min ago  (956+ words) Tighter limitations on quantum indeterminacy are now achievable, offering potential gains for secure communication and precise measurement. New theoretical bounds, derived for complex multipartite systems, demonstrably outperform previously established uncertainty relations in representative examples. These refined relations leverage quantum memories…...

2+ hour, 35+ min ago  (1061+ words) Conventional quantum optimisation methods falter as disorder increases, their computational effort scaling inversely with vanishing spectral gaps. RFOX, a new algorithm, circumvents this limitation by maintaining a nearly constant spectral gap, achieving near-optimal results with up to ten times fewer…...

2+ hour, 34+ min ago  (1078+ words) Quantum neural networks now train with only 8% performance overhead when moved between different computing platforms. This new architecture overcomes a major barrier to progress, allowing models developed in one system to run seamlessly on others without loss of accuracy. The…...

2+ hour, 30+ min ago  (1005+ words) Tighter bounds on precision, achieved within a Trotterization case, now permit more accurate calculations than previously possible using quantum phase estimation. These refined conditions link energy estimation directly to the precision of ground state projections, extending QPE beyond simple energy…...

2+ hour, 30+ min ago  (262+ words) Can a single photon truly "interrogate" five objects without being absorbed? This demonstration extends interaction-free measurement beyond a single item, sequentially probing up to five distinct objects with a solitary photon. The work offers a practical route towards scaling this…...

2+ hour, 4+ min ago  (1052+ words) Operators constructed from four or more quantum particles in one model follow a statistical pattern markedly different from another. Where the Lieb-Liniger model exhibits Fr'chet distributions for these matrix elements, the disorder-free Sachdev-Ye-Kitaev model instead aligns with a generalized inverse…...

2+ hour, 31+ min ago  (1178+ words) Can gravity fundamentally limit how precisely we know both the density and momentum of a quantum field at a given point in spacetime. New calculations demonstrate that spacetime curvature directly modulates these quantum uncertainties, establishing first-principles constraints for models of…...

2+ hour, 30+ min ago  (309+ words) Existing time synchronisation methods face fundamental limits imposed by signal propagation and environmental noise. Quantum clock synchronisation protocols now offer the potential to surpass these classical precision bounds, with improvements in clock stability revealed as exponential with increasing numbers of…...