2 papers
math.CO2026
Quaternionic Perfect Sequences and Hadamard Matrices
Aidan Bennett, Curtis Bright, Paul Colinot +1
A finite sequence of numbers is perfect if it has zero periodic autocorrelation after a nontrivial cyclic shift. In this work, we study quaternionic perfect sequences having a one-…
quant-ph2025
Lower Bounds for Learning Quantum States with Single-Copy Measurements
Angus Lowe, Ashwin Nayak
We study the problems of quantum tomography and shadow tomography using measurements performed on individual, identical copies of an unknown -dimensional state. We first revisit…