Quantum 2025 – scientific programme

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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.19: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Faithful certification of steerability-breaking channels — •Po-Ting Hsu and Shin-Liang Chen — Department of Physics, National Chung Hsing University, Taichung 40227 , Taiwan

We consider a scenario where Alice prepares a pair of particles and sends one to Bob through a quantum channel, and she convinces him that the pair is entangled. Namely, it is a steering scenario. Bob will never be convinced as long as the channel is steerability-breaking, i.e., the channel destroys steerability for any input state. To verify that the state undergoing channel is not useful for demonstrating steering, one has to consider all possible measurements performed by Alice and check if the conditional states Bob receives admit local-hidden-state (LHS) models. Intuitively, it is a hard problem since one has to consider an infinite combination of measurements. Here, we show a method that can be used to tackle this problem. We also explicitly consider several common quantum channels and derive conditions that the channels destroy steerability but still preserve entanglement.

Keywords: quantum steering; steerability-breaking channels; quantum channels; quantum entanglement; local-hidden-state (LHS) models