We demonstrate logic functionalities in a high-speed all-optical logic circuit based on differential Mach-Zehnder interferometers with semiconductor optical amplifiers as the nonlinear optical elements. The circuit, implemented by hybrid integration of the semiconductor optical amplifiers on a planar lightwave circuit platform fabricated in silica glass, can be flexibly configured to realize a ...

Phase matching is shown to provide a tunable gate that helps discriminate entangled states of light generated by four-wave mixing (FWM) in optical fibers against uncorrelated photons originating from Raman scattering. Two types of such gates are discussed. Phase-matching gates of the first type are possible in the normal dispersion regime, where FWM sidebands can be widely tuned by high-order d...

Over the last few decades, research in reversible logic has increasingly become very popular and it is gaining greater momentum in the present word. Reversible logic has started finding concert applications in quantum computing, optical computing, nano-technology based system, low-power CMOS design, VLSI design. The principal objective of this work is to argue for quantum implementation of vari...

1. Landauer’s Principle and the fundamentals of Reversible Logic. 2. Feynman, Fredkin and Toffoli gates. 3. Multiple -valued reversible logic and gates (Picton’s gates and circuits, our generalizations). 4. In the search of the best universal reversible gates. 5. Logic synthesis using reversible gates. 5.1. Cascades and work of Sasao/Kinoshita 5.2. Other regular structures and works of Picton, ...

In the paradigm of linear optics, quantum states of optical field modes are manipulated by means of photon sources, beam splitters, and photodetectors. This restriction of the allowed interactions introduces non-unit success probabilities into every non-trivial computation irrevocably. The resulting probabilistic nature of this architecture opens up questions about scalability of this approach ...

Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite the ease of implementation of one-qubit gates. Two-qubit gates necessarily need a non-linear interaction between the two photons, and the efficiency of this non-linear interaction is typically very small in bulk materials. However, it has recently been show...

Seven all-optical logic gates based on hybrid plasmonic squared-shaped nanoring resonators and strips are proposed, designed, numerically analyzed using finite element method with COMSOL software package version 5.5. Constructive destructive interferences between the input port(s) control main operating principles used to produce proposed gates. The ratio of output optical power at a single por...

We propose deterministic schemes for controlled-NOT (CNOT), Toffoli, and Fredkin gates between flying photon qubits and the collective spin wave (magnon) of an atomic ensemble inside double-sided optical microcavities. All the gates can be accomplished with 100% success probability in principle and no additional qubit is required. Atomic ensemble is employed so that light-matter coupling is rem...

The present document is devoted to the question of whether effective computation can be performed by the interaction of solitons [24, 34] in a bulk medium. The resulting computational system would fulfill the promise of Toffoli’s “programmable matter” [42] — offering computation that is very close to the underlying physics, and therefore potentially providing ultra-scale parallel processing. Th...