  For a partially degradable (PD) channel, the channel output state can be used
to simulate the degraded environment state. The quantum capacity of a PD
channel has been proven to be additive. Here, we show that the private
classical capacity of arbitrary dimensional PD channels is equal to the quantum
capacity of the channel and also single-letterizes. We prove that higher rates
of private classical communication can be achieved over a PD channel in
comparison to standard degradable channels.
