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Owing to a reduced solar background and low propagation losses in the atmosphere, the 2- to 2.5-$mu$m waveband is a promising candidate for daylight quantum communication. This spectral region also offers low losses and low dispersion in hollow-core fibers and in silicon waveguides. We demonstrate for the first time the capability for entanglement-based quantum key distribution (QKD) at 2.1 $mu$m, obtaining a positive secure-key rate (0.417 bits/pair, with a quantum bit error rate of 5.43%) using near-maximally entangled photon pairs in a proof-of-principle device-independent QKD scenario.
The ability of phase-change materials to reversibly and rapidly switch between two stable phases has driven their use in a number of applications such as data storage and optical modulators. Incorporating such materials into metasurfaces enables new
Deterministic coupling between photonic nodes in a quantum network is an essential step towards implementing various quantum technologies. The omnidirectionality of free-standing emitters, however, makes this coupling highly inefficient, in particula
Quantum information technologies harness the intrinsic nature of quantum theory to beat the limitations of the classical methods for information processing and communication. Recently, the application of quantum features to metrology has attracted mu
The theoretical community has found interest in the ability of a two-level atom to generate a strong many-body interaction with light under pulsed excitation. Single-photon generation is the most well-known effect, where a short Gaussian laser pulse
Exciton spin and related optical polarization in self-assembled InAs/In$_{0.53}$Ga$_{0.23}$Al$_{0.24}$As/InP(001) quantum dashes emitting at 1.55 {mu}m are investigated by means of polarization- and time-resolved photoluminescence, as well as photolu