Capacity of a channel assisted by two-mode squeezed states

The main purpose of this paper is to derive the capacity of attenuated or amplified noisy quantum channel assisted by two-mode squeezed states. In our previous works, formulas for capacity and reliability function have been obtained for continuous variable communication channel in the case where the classical information is conveyed by unentangled quantum Gaussian states. This paper investigates how two-mode squeezed states can enhance classical communication over quantum Gaussian channel