10 citations · 31 across the 20 of their papers we have counts for
6 papers · 1 filter
Quantum Channel Stein Theorem beyond Definite Causal Order
Chengkai Zhu, Xin Wang
The paper proves that for any two finite‑dimensional memoryless quantum channels, parallel, adaptive, and general testing strategies all achieve the same Stein exponent (the regula…
The Min-Rains Relative Entropy Is Not Tight for Exact PPT Entanglement Distillation
Chengkai Zhu, Xin Wang
Exact entanglement distillation converts a noisy bipartite state into a maximally entangled state with zero error. Under completely PPT-preserving operations, the additive min-Rain…
Quantum incapacity from observable shadows
Chengkai Zhu, Xin Wang
Quantum communication is ruled out when an eavesdropper can reconstruct the receiver's state. Yet states are operationally specified by measurement statistics, raising a sharper qu…
Witness expansion: A unified framework for analytical and measurable mixed-state resource detection
Yifan Tang, Chengkai Zhu, Yuzhen Zhang +6
Quantum information science aims to harness different kinds of quantum resources to accomplish specific information-processing tasks. These resources also play an increasingly impo…
Invariant Measures and Weak-Magic-Injection Asymptotics in Random Monitored Quantum Circuits
Guocheng Zhen, Xuanrong Yang, Chengkai Zhu +2
Monitored quantum circuits combine scrambling with measurement-conditioned state updates, while non-Clifford perturbations inject magic into otherwise stabilizer-compatible dynamic…
Entanglement cost of bipartite quantum channel discrimination under positive partial transpose operations
Chengkai Zhu, Shuyu He, Gereon Koßmann +1
Quantum channel discrimination is a fundamental task in quantum information processing. In the one-shot regime, discrimination between two candidate channels is characterized by th…