6 papers
Universality cost of non-Gaussian enhancement in continuous-variable quantum teleportation: A fidelity--deviation trade-off
Kyoungho Cho, Bongjune Kim, Jeongho Bang
Continuous-variable (CV) quantum teleportation is usually benchmarked by average fidelity, but when the teleportation is repeatedly used within optical networks or measurement-base…
Sharpening Worst-Case Error Assessment for Fault-Tolerant Quantum Computing: Fidelity and Its Deviation
Kyoungho Cho, Ilkwon Sohn, Yongsoo Hwang +1
Gate fidelity -- an average fidelity over all possible input states -- is the workhorse metric for benchmarking quantum gates or circuits, yet fault-tolerant quantum computing ulti…
Physics-Aware Learnability: From Set-Theoretic Independence to Operational Constraints
Jeongho Bang, Kyoungho Cho
Beyond binary classification, learnability can become a logically fragile notion: in EMX, even the class of all finite subsets of is learnable in some models of ZFC and not…
Quantum Interference Needs Convention: Overlap-Determinability and Unified No-Superposition Principle
Jeongho Bang, Kyoungho Cho, Ki Hyuk Yee
Quantum superposition is often phrased as the ability to add state vectors. In practice, however, the physical quantity is a ray (a rank-one projector), so each input specifies onl…
Learning at the Edge of Causality: Optimal Learning-Sample Complexity from No-Signaling Constraints
Jeongho Bang, Kyoungho Cho, Jeongwoo Jae
What ultimately fixes the sample cost of quantum learning -- algorithmic ingenuity or physical law? We study this question in an arena where computation, learning, and causality co…
Entangling Power and Its Deviation: A Quantitative Analysis on Input-State Dependence and Variability in Entanglement Generation
Kyoungho Cho, Jeongho Bang
Quantifying the entangling capability of quantum operations is a fundamental task in quantum information science. Traditionally, this capability is measured by the entangling power…