The logic of optics and the optics of logic

Unconditionally secure cryptosystems based on quantum cryptography

“…Second, the integration of a quantum cryptosystem into modern electronics depends on physics and technology, for instance, analyzing system entities such as particles, atoms, photons and electrons [27]. This characteristic may be considered a new direction in information processing, and it may open up a new technological avenue based on fundamental particle science.…”

What can we do with a linear optical logic gate?

“…Non-zero outputs arranged in a Gray code. 3 Hamiltonian path is a path that passes through every vertex of a graph exactly once. A Hamiltonian path which is also a loop is called Hamilton (or Hamiltonian) cycle.…”

“…That is not the case with polarization encoding. In our earlier work [3], we discussed some implications of the resulting reversibility. Here, we will explore more implications with some emphasis on the predetection cascading of such gates.…”

“…Following the lead of Landauer [6] and Bennett [2] on information-conserving (and thus reversible logic gates), we have investigated interferometric systems that can be interpreted as implementing Boolean logic operations [3]. Our approach is by no means the first among interferometric logic gates.…”

“…In phase encoding, the polarizations and amplitudes of the inputs are fixed but the phases corresponding to Boolean 0 and 1 differ by p [3]. The beamsplitter is non-polarizing.…”