  Entanglement offers substantial advantages in quantum information processing,
but loss and noise hinder its applications in practical scenarios. Although it
has been well known for decades that the classical communication capacity over
lossy and noisy bosonic channels can be significantly enhanced by entanglement,
no practical encoding and decoding schemes are available to realize any
entanglement-enabled advantage. Here, we report structured encoding and
decoding schemes for such an entanglement-assisted communication scenario.
Specifically, we show that phase encoding on the entangled two-mode squeezed
vacuum state saturates the entanglement-assisted classical communication
capacity over a very noisy channel and overcomes the fundamental limit of
covert communication without entanglement assistance. We then construct
receivers for optimum hypothesis testing protocols under discrete phase
modulation and for optimum noisy phase estimation protocols under continuous
phase modulation. Our results pave the way for entanglement-assisted
communication and sensing in the radio-frequency and microwave spectral ranges.
