论文标题
玻感通道的秘密容量
Covert Capacity of Bosonic Channels
论文作者
论文摘要
我们研究了有损热螺体通道的量子安全秘密通信能力，这是许多实际通道的量子力学模型。我们确定这些渠道的秘密容量的表达方式：$ l _ {\ text {no-ea}} $，当爱丽丝和鲍勃仅共享经典的秘密，而$ l _ {\ text {ea}} $，当它们从纠缠援助中受益时。我们发现，纠缠援助改变了秘密交流的基本规模法。代替$ l _ {\ text {no-ea}} \ sqrt {n} -r _ {\ text {no-ea}}}（n）$，$ r _ {\ text {no-ea}}} $L_{\text{EA}}\sqrt{n}\log n-r_{\text{EA}}(n)$, $r_{\text{EA}}(n)=o(\sqrt{n}\log n)$, covert bits to be transmitted reliably over $n$ channel uses.
We investigate the quantum-secure covert-communication capabilities of lossy thermal-noise bosonic channels, the quantum-mechanical model for many practical channels. We determine the expressions for the covert capacity of these channels: $L_{\text{no-EA}}$, when Alice and Bob share only a classical secret, and $L_{\text{EA}}$, when they benefit from entanglement assistance. We find that entanglement assistance alters the fundamental scaling law for covert communication. Instead of $L_{\text{no-EA}}\sqrt{n}-r_{\text{no-EA}}(n)$, $r_{\text{no-EA}}(n)=o(\sqrt{n})$, entanglement assistance allows $L_{\text{EA}}\sqrt{n}\log n-r_{\text{EA}}(n)$, $r_{\text{EA}}(n)=o(\sqrt{n}\log n)$, covert bits to be transmitted reliably over $n$ channel uses.
