论文标题
使用熵累积的特征设备对量子键分布的有限键分析
Finite-Key Analysis of Quantum Key Distribution with Characterized Devices Using Entropy Accumulation
论文作者
论文摘要
引入了熵积累定理（EAT），以显着提高与设备无关的量子信息处理任务（例如独立于设备无关的量子密钥分布（QKD））的有限尺寸率。一个自然的问题是，它是否也提高了依赖设备的QKD的速率。在这项工作中，我们为这个问题提供了肯定的答案。我们提出了将EAT应用于设备依赖性设置的新工具。我们提供了足够的条件，可以使马尔可夫链条件以及用于构建所需的最小贸易函数的一般算法。利用Dupuis的最新隐私放大而没有平滑结果，我们通过直接优化夹杂的rényi熵而不是考虑传统的平滑最小渗透性来提高关键速度。我们通过考虑几个示例，包括带有基于Qubit的版本的BB84协议以及具有现实的参数下调源，六态四州协议和BB84协议的高维类似物，来体现这些新工具。
The Entropy Accumulation Theorem (EAT) was introduced to significantly improve the finite-size rates for device-independent quantum information processing tasks such as device-independent quantum key distribution (QKD). A natural question would be whether it also improves the rates for device-dependent QKD. In this work, we provide an affirmative answer to this question. We present new tools for applying the EAT in the device-dependent setting. We present sufficient conditions for the Markov chain conditions to hold as well as general algorithms for constructing the needed min-tradeoff function. Utilizing Dupuis' recent privacy amplification without smoothing result, we improve the key rate by optimizing the sandwiched Rényi entropy directly rather than considering the traditional smooth min-entropy. We exemplify these new tools by considering several examples including the BB84 protocol with the qubit-based version and with a realistic parametric downconversion source, the six-state four-state protocol and a high-dimensional analog of the BB84 protocol.
