Yong‐Su Kim

Generation of a non-zero discord bipartite state with classical second-order interference

2017 · Optics Express

We report an investigation on quantum discord in classical second-order interference. In particular, we theoretically show that a bipartite state with D = 0.311 of discord can be generated via classical second-order interference. We also …

User-independent optical path length compensation scheme with sub-ns timing resolution for 1xN quantum key distribution network system

2020 · arXiv (Cornell University)

Quantum key distribution (QKD) networks constitute promising solutions for secure communication. Beyond conventional point-to-point QKD, we developed 1xN QKD network systems with a sub-ns resolution optical path length compensation scheme. With a practical plug-and-play QKD …

Global triplewise information trade-off in quantum measurement

2021 · arXiv (Cornell University)

State disturbance by a quantum measurement is at the core of foundational quantum physics and constitutes a fundamental basis of secure quantum information processing. While quantifying an information-disturbance relation has been a long-standing problem, recently …

Entanglement swapping via lossy channels using photon-number-encoded states

2024 · arXiv (Cornell University)

Entanglement shared between distant parties is a key resource in quantum networks. However, photon losses in quantum channels significantly reduce the success probability of entanglement sharing, which scales quadratically with the channel transmission. Quantum repeaters …

Ensuring superior learning outcomes and data security for authorized learner

2025 · Quantum Science and Technology

Abstract The learner’s ability to generate a hypothesis that closely approximates the target function is crucial in machine learning. Achieving this requires sufficient data; however, unauthorized access by an eavesdropping learner can lead to security …