Optimal design for universal multiport interferometers
Open accessAbstract
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.
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The C-A-K scheme and related ones are experimentally viable, theoretically clean and can implement any unitary on a single photon spread out over spatial modes.
“This scheme and related ones such as in refs.41, 42 are experimentally viable, theoretically clean and can implement any unitary on a single photon spread out over spatial modes.”
From Quantum generalisation of feedforward neural networks (2017) · cites this paper as [42]
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- Authors
- Clements, W. R., Humphreys, P. C., Metcalf, B. J., Kolthammer, W. S., & Walsmley, I. A.
- Venue
- Optica
- Publisher
- Optica Publishing Group
- Published
- 2016-12-06
- Volume
- 3
- Issue
- 12
- Pages
- 1460
- ISSN
- 2334-2536 (ISSN-L)
- OpenAlex
- W2320440260
- Cited by
- 1,216
- References
- 20
- Citations by year
- 2026: 157 · 2025: 220 · 2024: 201 · 2023: 175 · 2022: 131 · 2021: 115 · 2020: 85 · 2019: 65 · 2018: 41 · 2017: 19 · 2016: 6
- FWCI
- 35.97
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Optica (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- Spiral (Imperial College London) (submittedVersion, cc-by)
- arXiv (Cornell University)
- Figshare (cc-by)
- Funders
- European Research Council (ERC)
- Engineering and Physical Sciences Research Council (EPSRC) (EP/K034480/1, NQIT)
- European Commission (EC) (H2020-FETPROACT-2014 grant QUCHIP)
- Research Councils UK (RCUK)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Photonic and Optical Devices
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Keywords
- beam splitter, phase shifters, integrated photonics, quantum photonics
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