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Silicon photonic microresonator-based high-resolution line-by-line pulse shaping

https://doi.org/10.1038/s41467-024-52051-9

Cohen, Lucas_M; Wu, Kaiyi; Myilswamy, Karthik_V; Fatema, Saleha; Lingaraju, Navin_B; Weiner, Andrew_M (September 2024, Nature Communications)
High-dimensional discrete Fourier transform gates with a quantum frequency processor

https://doi.org/10.1364/OE.454677

Lu, Hsuan-Hao; Lingaraju, Navin_B; Leaird, Daniel_E; Weiner, Andrew_M; Lukens, Joseph_M (March 2022, Optics Express)

The discrete Fourier transform (DFT) is of fundamental interest in photonic quantum information, yet the ability to scale it to high dimensions depends heavily on the physical encoding, with practical recipes lacking in emerging platforms such as frequency bins. In this article, we show thatd-point frequency-bin DFTs can be realized with a fixed three-component quantum frequency processor (QFP), simply by adding to the electro-optic modulation signals one radio-frequency harmonic per each incremental increase ind. We verify gate fidelity $F_{W} > 0.9997$ and success probability $P_{W} > 0.965$ up tod = 10 in numerical simulations, and experimentally implement the solution ford = 3, utilizing measurements with parallel DFTs to quantify entanglement and perform tomography of multiple two-photon frequency-bin states. Our results furnish new opportunities for high-dimensional frequency-bin protocols in quantum communications and networking.
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Bell state analyzer for spectrally distinct photons

https://doi.org/10.1364/OPTICA.443302

Lingaraju, Navin_B; Lu, Hsuan-Hao; Leaird, Daniel_E; Estrella, Steven; Lukens, Joseph_M; Weiner, Andrew_M (March 2022, Optica)

We demonstrate a Bell state analyzer that operates directly on frequency mismatch. Based on electro-optic modulators and Fourier-transform pulse shapers, our quantum frequency processor design implements interleaved Hadamard gates in discrete frequency modes. Experimental tests on entangled-photon inputs reveal fidelities of $\sim<#comment/> 98 %<#comment/>$ for discriminating between the $| {Ψ<#comment/>}^{+} ⟩<#comment/>$ and $| {Ψ<#comment/>}^{-<#comment/>} ⟩<#comment/>$ frequency-bin Bell states. Our approach resolves the tension between wavelength-multiplexed state transport and high-fidelity Bell state measurements, which typically require spectral indistinguishability.
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Adaptive bandwidth management for entanglement distribution in quantum networks

https://doi.org/10.1364/OPTICA.413657

Lingaraju, Navin_B; Lu, Hsuan-Hao; Seshadri, Suparna; Leaird, Daniel_E; Weiner, Andrew_M; Lukens, Joseph_M (March 2021, Optica)

Flexible grid wavelength division multiplexing is a powerful tool in lightwave communications to maximize spectral efficiency. In the emerging field of quantum networking, the need for effective resource provisioning is particularly acute, given the generally lower power levels, higher sensitivity to loss, and inapplicability of optical detection and retransmission. In this letter, we leverage flex grid technology to demonstrate reconfigurable distribution of quantum entanglement in a four-user tabletop network. By adaptively partitioning bandwidth with a single wavelength-selective switch, we successfully equalize two-party coincidence rates that initially differ by over two orders of magnitude. Our scalable approach introduces loss that is fixed with the number of users, offering a practical path for the establishment and management of quality-of-service guarantees in large quantum networks.
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