Achievable rates for the Gaussian quantum channel

在噪声玻色广播信道中可实现的识别率

Achievable Identification Rates in Noisy Bosonic Broadcast Channels

本文研究了在噪声玻色广播信道中利用相干态实现的识别率，并通过量子假设检验和离散子集近似来维持功率约束。

Improved quantum capacity bounds of Gaussian loss channels and achievable rates with Gottesman-Kitaev-Preskill codes

Gaussian loss channels are of particular importance since they model realistic optical communication channels. Except for special cases, quantum capacity of Gaussian loss channels is not yet known completely. In this paper, we provide improved upper bounds of Gaussian loss channel capacity, both in the energy-constrained and unconstrained scenarios. We briefly review the Gottesman-Kitaev-Preskill (GKP) codes and discuss their experimental implementation. We then prove, in the energy-unconstrained case, that the GKP codes achieve the quantum capacity of Gaussian loss channels up to at most a co…

The classical capacity achievable by a quantum channel assisted by limited entanglement

We give the trade-off curve showing the capacity of a quantum channel as a function of the amount of entanglement used by the sender and receiver for transmitting information. The endpoints of this curve are given by the Holevo-Schumacher-Westmoreland capacity formula and the entanglement-assisted capacity, which is the maximum over all input density matrices of the quantum mutual information. The proof we give is based on the Holevo-Schumacher-Westmoreland formula, and also gives a new and simpler proof for the entanglement-assisted capacity formula.

纯损耗与放大信道下Gottesman-Kitaev-Preskill码的性能与可达速率

Performance and achievable rates of the Gottesman-Kitaev-Preskill code for pure-loss and amplification channels

该研究利用转置信道解析得到GKP码在纯损耗与纯放大信道下的近最优性能，揭示其与对偶格几何、输入能量的关联，证明特定GKP码族无能量约束时可同时达到两类信道容量，是首个实现该目标的结构化玻色码族。

One-Shot Achievable Secrecy Rate Regions for Quantum Interference Wiretap Channel

In this paper, we want to derive achievable secrecy rate regions for quantum interference channel with classical inputs under one-shot setting. The main idea to this end is to use the combination of superposition and rate splitting for encoding scheme and constructing a decoding scheme based on simultaneous decoding.

Determination of maximal Gaussian entanglement achievable by feedback-controlled dynamics

We determine a general upper bound for the steady-state entanglement achievable by continuous feedback for systems of any number of bosonic degrees of freedom. We apply such a bound to the specific case of parametric interactions - the most common practical way to generate entanglement in quantum optics - and single out optimal feedback strategies that achieve the maximal entanglement. We also consider the case of feedback schemes entirely restricted to local operations and compare their performance to the optimal, generally nonlocal, schemes.