Quantum Journal

The Global Geometry of the Gaussian Bures Manifold: Admissible Domain, Spectral Boundary, and Asymptotic Classicality

We construct the covariance-sector Bures geometry of centered bosonic Gaussian states from the Gaussian symmetric-logarithmic-derivative equation and determine its quantum-admissible domain. At the Williamson uncertainty floor, the boundary geometry is anisotropic: spectrum-changing radial coefficients diverge, whereas squeezing and rotation directions along the pure Gaussian orbit remain finite. Dually, the covariance cometric acquires an exact...

Quantum Encodings, Private Messages, and Communication Complexity

We study the complexity of quantum decomposable randomized encodings (QDRE). We establish a bi-directional connection between the QDRE model and the communication complexity model of quantum private simultaneous message protocols (QPSM), where classical communication is free, and quantum communication is the primary complexity measure. We show the following upper and lower bounds. (1) For every quantum channel mapping $n$ to $m$ qubits, we give...

IonQ Secures Multiple Best Paper Awards at IEEE Quantum Conference, Highlighting Breakthroughs in Scalable Architecture

IonQ has been recognized with four 'Best Paper' awards at the IEEE Quantum Conference, spanning several critical research tracks. The accolades underscore the company's significant progress in advancing the scalability and reliability of trapped-ion quantum computing.

Methods and Apparatus to Allocate Physical Qubits to Support Distributed Quantum Error Correction (QEC) Codes - eurekalert.org