2018/02/07 by Kai Sun, Xiang-Jun Ye, Ya Xiao +6 · 81 citations
Computer Science · Physics and Astronomy · #Amplitude damping channel #Channel (broadcasting) #Characterization (materials science) #EPR paradox #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Realization (probability) #Task (project management) #physics.optics #quant-ph
paper · pdf · doi:10.1038/s41534-018-0067-1
published in npj Quantum Information 4(1) (Nature Portfolio) · 16 pages, 8 figures, appendix included
openalex publication_date 2018/02/07 · arxiv created 2018/02/26 · arxiv updated 2018/02/27 · openalex created_date 2018/03/06 · openalex updated_date 2026/08/05
Abstract Einstein–Podolsky–Rosen (EPR) steering describes a quantum nonlocal phenomenon in which one party can nonlocally affect the other’s state through local measurements. It reveals an additional concept of quantum non-locality, which stands between quantum entanglement and Bell nonlocality. Recently, a quantum information task named as subchannel discrimination (SD) provides a necessary and sufficient characterization of EPR steering. The success probability of SD using steerable states is higher than using any unsteerable states, even when they are entangled. However, the detailed construction of such subchannels and the experimental realization of the corresponding task are still technologically challenging. In this work, we designed a feasible collection of subchannels for a quantum channel and experimentally demonstrated the corresponding SD task where the probabilities of correct discrimination are clearly enhanced by exploiting steerable states. Our results provide a concrete example to operationally demonstrate EPR steering and shine a new light on the potential application of EPR steering.