262 citations · 656 across the 13 of their papers we have counts for
13 papers
Strong Converse Exponent for Entanglement-Assisted Communication
Ke Li, Yongsheng Yao
We determine the exact strong converse exponent for entanglement-assisted classical communication of a quantum channel. Our main contribution is the derivation of an upper bound fo…
Operational Interpretation of the Sandwiched Rényi Divergence of Order 1/2 to 1 as Strong Converse Exponents
Ke Li, Yongsheng Yao
We provide the sandwiched Rényi divergence of order , as well as its induced quantum information quantities, with an operational interpretation in the characte…
Reliable Simulation of Quantum Channels: the Error Exponent
Ke Li, Yongsheng Yao
The Quantum Reverse Shannon Theorem has been a milestone in quantum information theory. It states that asymptotically reliable simulation of a quantum channel, assisted by unlimite…
Reliability Function of Quantum Information Decoupling via the Sandwiched Rényi Divergence
Ke Li, Yongsheng Yao
Quantum information decoupling is a fundamental quantum information processing task, which also serves as a crucial tool in a diversity of topics in quantum physics. In this paper,…
Tight Exponential Analysis for Smoothing the Max-Relative Entropy and for Quantum Privacy Amplification
Ke Li, Yongsheng Yao, Masahito Hayashi
The max-relative entropy together with its smoothed version is a basic tool in quantum information theory. In this paper, we derive the exact exponent for the asymptotic decay of t…
Uniform Additivity in Classical and Quantum Information
Andrew W. Cross, Ke Li, Graeme Smith
Information theory establishes the fundamental limits on data transmission, storage, and processing. Quantum information theory unites information theoretic ideas with an accurate…
Squashed entanglement, k-extendibility, quantum Markov chains, and recovery maps
Ke Li, Andreas Winter
Squashed entanglement [Christandl and Winter, J. Math. Phys. 45(3):829-840 (2004)] is a monogamous entanglement measure, which implies that highly extendible states have small valu…
Quantum de Finetti theorem under fully-one-way adaptive measurements
Ke Li, Graeme Smith
We prove a version of the quantum de Finetti theorem: permutation-invariant quantum states are well approximated as a probabilistic mixture of multi-fold product states. The approx…
Maximal Privacy Without Coherence
Debbie Leung, Ke Li, Graeme Smith +1
Privacy lies at the fundament of quantum mechanics. A coherently transmitted quantum state is inherently private. Remarkably, coherent quantum communication is not a prerequisite f…
Relative entropy and squashed entanglement
Ke Li, Andreas Winter
We are interested in the properties and relations of entanglement measures. Especially, we focus on the squashed entanglement and relative entropy of entanglement, as well as their…
Experimental investigation of the entanglement-assisted entropic uncertainty principle
Chuan-Feng Li, Jin-Shi Xu, Xiao-Ye Xu +2
The uncertainty principle, which bounds the uncertainties involved in obtaining precise outcomes for two complementary variables defining a quantum particle, is a crucial aspect in…
The private capacity of quantum channels is not additive
Ke Li, Andreas Winter, XuBo Zou +1
Recently there has been considerable activity on the subject of additivity of various quantum channel capacities. Here, we construct a family of channels with sharply bounded class…
A father protocol for quantum broadcast channels
Frédéric Dupuis, Patrick Hayden, Ke Li
A new protocol for quantum broadcast channels based on the fully quantum Slepian-Wolf protocol is presented. The protocol yields an achievable rate region for entanglement-assisted…