Implementation of a 3 x 3 directionally-unbiased linear optical multiport
arXiv:2106.13473 · doi:10.1364/OE.436075
Abstract
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 x 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 x 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.
arXiv comment8 pages, 4 figures
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Cited by in corpus (6)
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- Enhanced-sensitivity interferometry with phase-sensitive unbiased multiports
- Interferometry and higher-dimensional phase measurements using directionally unbiased linear optics
- Experimental demonstration of a Grover-Michelson interferometer
- Deterministic linear-optical computing with symmetry-based qubits
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