# Linear Optical Deterministic and Reconfigurable SWAP Gate

## TL;DR

This paper introduces a reconfigurable, deterministic SWAP gate for spatially encoded qubits using integrated photonic components, enabling efficient quantum network operations with minimal overhead.

## Contribution

It presents a novel, reconfigurable optical SWAP gate design using waveguide crossings and interferometers, suitable for scalable quantum computing.

## Key findings

- The gate can be reconfigured to perform SWAP or identity operations.
- It is compatible with nearest neighbor quantum networks.
- The design offers minimal overhead for quantum operations.

## Abstract

We propose a deterministic SWAP gate for spatially encoded qubits. The gate is constructed from waveguide crossings, Mach Zender Interferometers and phase shifters providing the gate reconfigurability. Through manipulating the phase of the phase shifters, we can apply either the SWAP or identity gates. As an essential element of nearest neighbor qubit networks, the SWAP gate has a simple structure and presents minimal overhead, making it viable for universal quantum computation.