标题： 具有额外纠缠的抗退化量子信道的能力 显示英文标题

标题： Capability of anti-degradable quantum channel with additional entanglement

摘要： 量子通信理论关注的是用于传输量子信息的量子信道的研究，其中传输速率通过量子信道容量来衡量。 这一量具有若干引人入胜的特性，例如非可加性、超激活等。 在本工作中，我们表明一种称为反可降解单模高斯信道的量子信道——其容量被认为为零——可以通过引入量子纠缠被“激活”，从而传输量子信息。 尽管该信道的输出单独无法用于恢复输入信号，但将其与额外的纠缠结合则可以实现这一点。 除了理论意义外，这种激活也可以在实际系统中实现。 例如，在双模压缩相互作用 regime 中用于量子转换的电光系统中，转换信道是反可降解的。 我们证明，在辅助模式的纠缠协助下，该系统可以传输微波-光子量子信息。 这导致了一种新型的量子转换器，在广泛的参数空间内表现出正的量子容量。 显示英文摘要

摘要： Quantum communication theory focuses on the study of quantum channels for transmitting quantum information, where the transmission rate is measured by quantum channel capacity. This quantity exhibits several intriguing properties, such as non-additivity, superactivation and so on. In this work, we show that a type of quantum channel known as the anti-degradable one-mode Gaussian channel -- whose capacity is believed to be zero -- can be ``activated" to transmit quantum information through the introduction of quantum entanglement. Although the channel's output alone cannot be used to retrieve the input signal, combining it with extra entanglement makes this possible. Beyond its theoretical implications, this activation can also be realized in practical systems. For example, in electro-optic systems used for quantum transduction in the two-mode squeezing interaction regime, the transduction channel is anti-degradable. We demonstrate that this system can transmit microwave-optical quantum information with the assistance of entanglement with an ancillary mode. This results in a new type of quantum transducer that exhibits positive quantum capacity over a wide parameter space.