Continuous-variable quantum key distribution (CVQKD) is a promising alternative to commonly used discrete-variable QKD protocols, because this technology can be implemented with standard telecom components and recent results suggest that it will be compatible with standard wavelength division multiplexed telecommunication networks . Security proofs against general eavesdropping attacks are available for CVQKD protocols using Gaussian modulation , and field implementations over deployed telecommunication networks have been demonstrated over the past few years .
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