A Shot Noise Limited Quantum Iterative Massive MIMO System Over Poisson Atmospheric Channels.

Quantum wireless communications (QWC) is emerging as a promising candidate for future terrestrial information networks. In this paper, over noisy quantum atmospheric turbulence channels, a new non-orthogonal coherent-state massive-MIMO uplink scheme is proposed. At the receiver, a composite quantum iterative multi-stage measuring instrument and MIMO detector is developed. In particular, a non-additive Poisson shot noise limited quantum iterative massive-MIMO interference cancellation algorithm is derived. Simulation results show that the proposed scheme is capable of obtaining the substantial spatial diversity gain in severely noisy quantum turbulence channels, while effectively mitigating the quantum multi-user (MU) interference. Quantitatively, for the 8 × 64 MIMO scenario, it can achieve the BER of 10⁻⁶ at −179.3dBJ per bit over a strong Gamma-Gamma turbulence fading channel (αc = 2.1, βc = 2.4). Furthermore, the proposed scheme can provide significant performance improvements over a recent reported photon-counting MIMO receiver [18].