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Fidelity Restorable Universal Linear Optics
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DOI：10.1002/adpr.202200001.png)
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Abstract
En 中文
Universal multiport interferometers that can be programmed to perform any unitary or linear transformation turn into an important building block for both classical and quantum photonics. These interferometers typically utilize the mathematical framework of U(2) unitary matrix decomposition techniques and comprise a mesh of 2 similar to 2 beam splitters and phase shifters. All of them are, however, inherently fidelity limited as their U(2)-based deployment approach leads to imbalanced path losses without supporting any fidelity restoration mechanism. Herein, a novel Universal Generalized Mach-Zehnder Interferometer (UGMZI) architecture is presented that migrates from U(2) decomposition techniques and adopts a recursive U(N) decomposition, exploiting cascaded size-augmenting N similar to N beam splitters and phase shifters. The design can natively support fidelity restoration and safeguard absolute fidelity, while outperforming the state-of-theart designs also with respect to phase-error-induced fidelity performance properties. Finally, it is demonstrated that its fidelity restoration properties turn the design into the optimal architecture for constructing any real/complex-valued matrix via the singular value decomposition (SVD) scheme.
Keywords:
neuromorphic photonics
optical signal processing
linear optics
Journal
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18.8
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981
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