The nondispersive per-sample channel model for the optical fiber is considered. Under certain smoothness assumptions, problem of finding minimum amount noise energy that can render two different input points indistinguishable formulated. This then taken as a measure distance between in alphabet. Using machinery optimal control theory, necessary conditions describe minimum-energy trajectories ar...

When moving from known-input security to chosen-input security, some generic attacks sometimes become possible and must be discarded by a specific set of rules in the threat model. Similarly, common practices consist of fixing security systems, once an exploit is discovered, by adding a specific rule to thwart it. To study feasibility, we investigate a new security notion: security against unde...

On-demand single-photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are critical assets toward deployment of fiber-based quantum networks. Indeed, single may serve as flying qubits, allowing communication information over long distances. Self-assembled InAs dots embedded in GaAs constitute an excellent nearly deterministic source high-quality photons,...