Tag: Quantum
New quantum bit thread prescriptions match holographic entropy formula
What the study found The authors derive several new quantum bit thread prescriptions for holographic entanglement entropy. They report that these prescriptions are equivalent, for static states, to the quantum extremal surface formula. Why the authors say this matters The study suggests that these prescriptions provide new ways to describe holographic entanglement entropy. The authors…
Bell nonlocality observed in tau-pair collisions at the LHC
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What the study found The study reports that tau-plus tau-minus pairs produced in proton-proton collisions at the Large Hadron Collider can be analyzed as an entangled two-qubit quantum state, and that Bell nonlocality was observed with high statistical significance. The authors say tau-plus tau-minus is an ideal system for quantum information studies in high-energy collisions.…
Finite environments limit objectivity in quantum Brownian motion
What the study found The study revisits objectivity in the quantum Brownian motion model under the recoilless, or Born-Oppenheimer, limit. It finds that complete objectivity cannot be achieved when the environment has only a finite number of oscillators, and that objectivity depends on timescales. Why the authors say this matters The authors say the work…
Hardware-efficient Mølmer–Sørensen gate performs comparably on superconducting hardware
What the study found A hardware-efficient implementation of the Mølmer–Sørensen gate was tested on superconducting quantum hardware and showed performance close to the device’s native controlled-NOT (CX) gate. The gate also produced the target Bell state from the |00⟩ input with a reported success probability of 94.2%. Why the authors say this matters The authors…
Review outlines control of reactions in radiofrequency ion traps
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What the study found Radiofrequency ion traps allow a high degree of control over ion-molecule dynamics, and the review summarizes ways to use that control in chemical reaction studies. It covers trapping and cooling methods, approaches for setting internal quantum states, ways to tune collision energy, and methods for selecting molecular structure. Why the authors…
Catalyst towers can lower runtime and spacetime cost at smaller code distances
What the study found Catalyst towers, a technique for implementing continuous rotations in a surface code, can reduce runtime and, at small and medium code distances, can also decrease the total spacetime volume of rotations. At large code distances, the study says conventional Clifford+T synthesis may be more efficient. Why the authors say this matters…
Domain roughness grows across Mn3NiN phase transition
What the study found Mn3NiN changes from a ferrimagnetic state to a non-collinear antiferromagnetic state with a disordered, dendritic magnetic domain structure. The domain roughness increases on cooling and reaches a fractal dimension of about 1.55 in the non-collinear phase. Why the authors say this matters The authors say that controlling magnetic domain states is…
Multilayer superconducting hardware can place and route qLDPC codes
What the study found The study found that a hardware-aware layout method called HAL can automate and optimize the placement and routing of arbitrary quantum low-density parity-check (qLDPC) codes in multilayer superconducting hardware. The authors also report that they generated around 150 explicit qLDPC code layouts and identified code designs with competitive tradeoffs between hardware…
Hybrid scaling explains overlapping Yang-Lee critical regions
What the study found The study found that, in the overlapping critical region between classical and quantum Yang-Lee edge singularities, scaling behavior can be described by a hybrid scaling mechanism. This means scaling functions from both critical regimes apply at the same time and obey a constraint relation. Why the authors say this matters The…
Upper bound estimated for Weyl points from multifold degeneracies
What the study found The study finds an upper bound on the number of Weyl points, meaning generic twofold energy-degeneracy points, that can arise when a multifold degeneracy point in a quantum system is perturbed. Why the authors say this matters The authors say their work helps connect physics and mathematics by using singularity theory…
