Quantum teleportation constitutes a fundamental tool for various applications in quantum
communication and computation. However, state-of-the-art continuous-variable quantum …

The ability to manipulate light at the level of single photons, its elementary excitation quanta,
has recently made it possible to produce a rich variety of tailor-made quantum states and …

Noise is the price to pay when trying to clone or amplify arbitrary quantum states. However,
the quantum noise associated with linear phase-insensitive amplifiers can be avoided by …

We study a coherent superposition t â+ r ↠of field annihilation and creation operators
acting on continuous variable systems and propose its application for quantum state …

Phase-insensitive optical amplification of an unknown quantum state is known to be a
fundamentally noisy operation that inevitably adds noise to the amplified state,,,,. However …

Entanglement distillation is an indispensable ingredient in extended quantum
communication networks. Distillation protocols are necessarily non-deterministic and require …

Quantum optical states are fragile and can become corrupted when passed through a lossy
communication channel. Unlike for classical signals, optical amplifiers cannot be used to …

Linear amplifiers necessarily introduce a minimal amount of noise, as required by
Heisenberg's relation in quantum mechanics. Such a limitation could be overcome when …

We propose a protocol for conditional suppression of losses in direct quantum state
transmission over a lossy quantum channel. The method works by noiselessly attenuating …

Heralded noiseless amplification based on single-photon sources and linear optics is ideally
suited for long-distance quantum communication tasks based on discrete variables. We …