Author

Sangwoo Jeon

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Preprint Aug 2026

Optimal copy complexity of quantum state cloning

Quantum state cloning is the task of approximately producing additional copies of an unknown quantum state from a finite number of input copies. The optimal cloning fidelity is known exactly for pure states, but no comparable characterization is known for general mixed states. We determine the optimal asymptotic copy c...

Sangwoo Jeon, Vaughn Sohn, Changhun Oh · 1 citation

Preprint Jul 2026

Bound Entanglement Is Insufficient for an Exponential Quantum Learning Advantage

While entanglement is known to enable exponential improvements in the sample complexity of quantum learning, it remains unclear which properties of entangled resources are responsible for such improvements. We address this question through the reduction criterion, a condition obeyed by all bound-entangled states. In $n...

Hyeongu Kang, Sangwoo Jeon, Changhun Oh · 0 citations