In principle, quantum key distribution (QKD) offers information-theoretic security based on
the laws of physics. In practice, however, the imperfections of realistic devices might …

Twisted photons can be used as alphabets to encode information beyond one bit per single
photon. This ability offers great potential for quantum information tasks, as well as for the …

Internet data traffic capacity is rapidly reaching limits imposed by optical fiber nonlinear
effects. Having almost exhausted available degrees of freedom to orthogonally multiplex …

In recent years, there has been a rising interest in high‐dimensional quantum states and
their impact on quantum communication. Indeed, the availability of an enlarged Hilbert …

Multiphoton interference reveals strictly nonclassical phenomena. Its applications range
from fundamental tests of quantum mechanics to photonic quantum information processing …

The orbital angular momentum of light represents a fundamentally new optical degree of
freedom. Unlike linear momentum, or spin angular momentum, which is associated with the …

Quantum key distribution (QKD) systems often rely on polarization of light for encoding, thus
limiting the amount of information that can be sent per photon and placing tight bounds on …

Quantum key distribution (QKD) promises information-theoretically secure communication
and is already on the verge of commercialization. The next step will be to implement high …

Entanglement is an important resource for quantum technologies. There are many ways
quantum systems can be entangled, ranging from the two-qubit case to entanglement in …

Transverse spatial modes of light offer a large state-space with interesting physical
properties. For exploiting these special modes in future long-distance experiments, the …