Equivalence between squeezed-state and twin-beam communication channels

Details Equivalence between squeezed-state and twin-beam communication channels Equivalence between squeezed-state and twin-beam communication channels

1997-04-17

arxiv.org/abs/quant-ph/9704033v2

Modern Phys. Lett. B11, 1263 (1997).

Physics

Quantum Physics

15 pages. Two latex figures included. To appear on Modern Phys. Lett. B

Scientific paper

10.1142/S0217984997001511

We show the equivalence between two different communication schemes that employ a couple of modes of the electromagnetic field. One scheme uses unconventional heterodyne detection, with correlated signal and image-band modes in a twin-beam state from parametric downconversion. The other scheme is realized through a complex-number coding over quadrature-squeezed states of two uncorrelated modes, each detected by ordinary homodyning. This equivalence concerns all the stages of the communication channel: the encoded state, the optimal amplifier for the channel, the master equation modeling the loss, and the output measurement scheme. The unitary transformation that connects the two communication schemes is realized by a frequency conversion device.

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