7 papers
Geometric Optimization over Quantum State Spaces: Tight Uncertainty Relations and Resource Certification
Ma-Cheng Yang, Cong-Feng Qiao
Determining the fundamental limits of nonlinear functionals of quantum measurement statistics is a crucial yet generally intractable non-convex optimization problem. We introduce a…
Witness High-Dimensional Quantum Steering via Majorization Lattice
Ma-Cheng Yang, Cong-Feng Qiao
Quantum steering enables one party to influence another remote quantum state by local measurement. While steering is fundamental to many quantum information tasks, the existing det…
Conditions for Quantum Violation of Macrorealism in Large-spin Limit
Qi-Hong Cai, Xue-Hao Yu, Ma-Cheng Yang +2
This study investigates the emergence of macroscopic classical behavior from quantum foundations via the entropic Leggett--Garg inequality. We introduce a geometric framework for d…
A Universal Quantum Certainty Relation for Arbitrary Number of Observables
Ao-Xiang Liu, Ma-Cheng Yang, Cong-Feng Qiao
We derive by lattice theory a universal quantum certainty relation for arbitrary observables in -dimensional system, which provides a state-independent maximum lower bound o…
An Effective Way to Determine the Separability of Quantum State
Ma-Cheng Yang, Cong-Feng Qiao
We propose in this work a practical approach to address the longstanding and challenging problem of quantum separability, leveraging the correlation matrices of generic observables…
Entanglement Criteria Based on Quantum Fisher Information
Ao-Xiang Liu, Ma-Cheng Yang, Cong-Feng Qiao
To optimize the entanglement detection, we formulate the metrologically operational entanglement condition in quantum Fisher information by maximizing the QFI on the measurement or…