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Quantum 2.0 Conference and Exhibition

Directionally-unbiased Linear Multiports: Quantum Interference and Registration of Multi-Dimensional Rotation

David S. Simon, Christopher R. Schwarze, Alexander V. Sergienko

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We describe a quantum walk in which photons remain clustered together as they walk along a chain. This effect can be used to construct higher-dimensional quantum Sagnac interferometers that measure rotaƟons about three axes simultaneously.
DOI
10.1364/quantum.2024.qtu3a.31

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Linear optical multiports are widely used in photonic quantum information processing. Naturally, these devices are directionally-biased since photons always propagate from the input ports toward the output ports. Recently, the concept of directionally-unbiased linear optical multiports was proposed. These directionally-unbiased multiports allow photons to propagate along a reverse direction, which can greatly reduce the number of required linear optical elements for complicated linear optical quantum networks. Here, we report an experimental demonstration of a 3 × 3 directionally-unbiased linear optical fiber multiport using an optical tritter and mirrors. Compared to the previous demonstration using bulk optical elements which works only with light sources with a long coherence length, our experimental directionally-unbiased 3 × 3 optical multiport does not require a long coherence length since it provides negligible optical path length differences among all possible optical trajectories. It can be a useful building block for implementing large-scale quantum walks on complex graph networks.