论文标题
玻色剂驱动通道的量子能力
Quantum capacity of bosonic dephasing channel
论文作者
论文摘要
我们研究了连续可变驱动通道的量子能力，这是非高斯量子通道的一个显着例子。我们证明适用单个字母公式。然后，我们考虑输入能量限制，并表明，通过增加容量，容量饱和到有限的值。发现最佳输入状态在Fock的基础上是对角线的，并且分布是高斯的离散版本。提出了其平均值/方差与分离率/输入能量之间的关系。我们还表明，对于较大的除多率值，量子能力呈指数衰减。
We study the quantum capacity of continuous variable dephasing channel, which is a notable example of non-Gaussian quantum channel. We prove that a single letter formula applies. We then consider input energy restriction and show that by increasing it, the capacity saturates to a finite value. The optimal input state is found to be diagonal in the Fock basis and with a distribution that is a discrete version of a Gaussian. Relations between its mean/variance and dephasing rate/input energy are put forward. We also show that quantum capacity decays exponentially for large values of dephasing rates.
