Preparation of non-local superpositions of quasi-classical light states

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Quantum repeaters based on atomic ensembles and linear optics (2009, methodology): “In a recent experiment, coherent-state type entanglement was created using photon counting (Ourjoumtsev et al., 2009), suggesting that hybrid approaches combining pho- ton counting and homodyne detection may be promising.”
Twin-field quantum key distribution over 830-km fibre (2019, background): “Different from the traditional QKD [13, 31], a big advantage of RRDPS is that it can tolerate up to 50% QBER, which is a strong candidate protocol under the high noise channel.”
Remote creation of hybrid entanglement between particle-like and wave-like optical qubits (2013, methodology): “or the remote generation of quasi-Bell states in the continuous variable regime [23], our scheme relies on a probabilistic preparation heralded by the detection of a singlephoton in an indistinguishable fashion.”
Hybrid discrete- and continuous-variable quantum information (2014, background): “Entangled coherent states can be generated by non-local photon subtraction over a lossy channel [85], and these entangled cat states can be made arbitrarily large through conditional homodyne detection [86].”
Entanglement distillation from Gaussian input states (2010, background): “demonstrated the increase [21] and preparation [22] of entanglement from Gaussian inputs, and thus proved that photon subtraction is capable of providing the nonlinearity needed for distillation.”