University:
California State University, East Bay
Course:
CS 3590 | Data Communications and Networking
Academic year:

2023
Views:

200

Pages:

1
Author:

Jithin J I

ELECTRO-OPTIC REVERSIBLE LOGIC GATES Introduction  Reversible logic aims to reduce energy dissipation compared to conventional logic.  Optical switches like electro-optic Mach-Zehnder interferometer (MZI) used for reversible photonic gates. Electro-optic MZI Reversible Gates  MZI acts as optical switch based on applied electrode voltage.  Several reversible gates designed with MZIs: Feynman, Fredkin, Optimized Fredkin, Modified Fredkin  Gates characterized by optical cost (MZIs used) and optical delay Implementing Random Boolean Function  Function must satisfy bijection property to be reversible.  Additional outputs may be needed to make function reversible.  Example function: f(x,y,z) = x.y ⊕ z MZI Implementations  Combinations of Feynman, (Optimized) Fredkin, Modified Fredkin gates explored  Some need ancilla (fixed) inputs to get correct logic function  Lowest optical cost: Optimized Fredkin + Feynman (7 MZIs) Conclusion  Reversible photonic logic gates can implement arbitrary Boolean functions  Optimization balances optical cost and delay  Results useful for low-power nanophotonic computing circuits