16 papers
Optimal dense materialization of the stabilizer formalism without polynomial overhead
Hyunho Cha, Jungwoo Lee
Stabilizer states and Clifford transformations constitute the exactly tractable backbone of quantum information science, from error correction and fault tolerance to benchmarking a…
Disjoint Bell measurements enable near-projective GHZ certification
Hyunho Cha, Jungwoo Lee
Certifying multipartite entangled states is a basic task in quantum information processing, but the achievable copy complexity depends crucially on the measurements available to th…
One-parameter counterexamples to the refined Bessis-Moussa-Villani conjecture
Hyunho Cha, Jungwoo Lee
Positivity of matrix trace exponentials is a basic structural principle behind finite-temperature quantum statistical mechanics. The Bessis-Moussa-Villani conjecture, a central man…
Counting anticommuting Pauli pairs in linear time
Hyunho Cha, Jungwoo Lee
Many quantum computing workflows manipulate long lists of Pauli strings. A basic classical subroutine involves taking Pauli strings on qubits, each of weight bounded by a c…
Spectral Minimax Direct Fidelity Estimation for Generic Target States
Hyunho Cha, Jungwoo Lee
Direct fidelity estimation benefits from tailoring measurements to a fixed target, but the operator-aware shadow importance sampling (OASIS) method optimizes an outcome-wise linear…
Online Estimation of Partial Transpose Moments via Fast Classical Updates
Hyunho Cha, Jungwoo Lee
Partial-transpose (PT) moments are among the most practically relevant nonlinear quantities accessible from local Pauli classical shadows, because they directly underpin mixed-stat…