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Single Particle Interferometric Analogues of Multipartite Entanglement

Karl Svozil

Published Jan 20, 2004• 1 citation
OpenAlex

Abstract

Based on research by Reck et al. [1] and Zukowski et al. [2], preparation and measurement configurations for the singlet states of two and three two- and three-state particles are enumerated in terms of multiport interferometers.

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Universal multiport interferometers, which can be programmed to implement any linear transformation between multiple channels, are emerging as a powerful tool for both classical and quantum photonics. These interferometers are typically composed of a regular mesh of beam splitters and phase shifters, allowing for straightforward fabrication using integrated photonic architectures and ready scalability. The current, standard design for universal multiport interferometers is based on work by Reck et al. [Phys. Rev. Lett.73, 58 (1994)PRLTAO0031-900710.1103/PhysRevLett.73.58]. We demonstrate a new design for universal multiport interferometers based on an alternative arrangement of beam splitters and phase shifters, which outperforms that by Reck et al. Our design requires half the optical depth of the Reck design and is significantly more robust to optical losses.