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Nonlinear integrated photonics for quantum communications and computing

Galan Moody

Published Jun 13, 2023• 0 citations
Publisher

Abstract

With recent and rapid progress, compound semiconductor on insulator (CSOI) photonics is transforming quantum technologies by providing new functionalities and capabilities not possible with traditional, silicon-based photonics. In this talk, I will discuss how we can leverage the strong nonlinearities and low propagation loss of AlGaAs-on-insulator photonics for quantum computing and communications. I will present recent results on entangled-pair and squeezed-light generation, on-chip frequency bin processors based on integrated modulators and pulse shapers, and architectures for high-dimensional graph-state generation for distributing entanglement across quantum networks.

DOI
10.1117/12.2663696

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With recent and rapid progress, compound semiconductor on insulator (CSOI) photonics is transforming quantum technologies by providing new functionalities and capabilities not possible with traditional, silicon-based photonics. In this talk, I will discuss how we can leverage the strong nonlinearities and low propagation loss of AlGaAs-on-insulator photonics for quantum computing and communications. I will present recent results on entangled-pair and squeezed-light generation, on-chip frequency bin processors based on integrated modulators and pulse shapers, and architectures for high-dimensional graph-state generation for distributing entanglement across quantum networks.
With recent and rapid progress, compound semiconductor on insulator (CSOI) photonics is transforming quantum technologies by providing new functionalities and capabilities not possible with traditional, silicon-based photonics. In this talk, I will discuss how we can leverage the strong nonlinearities and low propagation loss of CSOI photonics to engineer and manipulate complex quantum photonic states on chip. I will present recent results on creating indistinguishable arrays of entangled-pair and squeezed light sources pumped with continuous wave and pulsed excitation, on-chip line-by-line quantum frequency comb shaping, and tunable microring resonator arrays for frequency bin qudits.
Photonic quantum technologies are a promising platform for applications ranging from long-distance secure communications to the simulation of complex phenomena. Among the different material platforms direct bandgap semiconductors offer a wide range of functionalities opening promising perspectives for the implementation of future quantum technologies. In this talk, I review our progress on the generation and manipulation of quantum states of light in nonlinear AlGaAs chips and their use in quantum networks.
Integrated photonics provides a powerful approach for developing compact, stable and scalable architectures for the generation, manipulation and detection of quantum states of light. To this end, several material platforms are being developed in parallel, each providing its specific assets, and hybridization techniques to combine their strengths are now possible. This review focuses on AlGaAs, a III-V semiconductor platform combining a mature fabrication technology, direct band-gap compliant with electrical injection, low-loss operation, large electro-optic effect, and compatibility with superconducting detectors for on-chip detection. We detail recent implementations of room-temperature sources of quantum light based on the high second- and third-order optical nonlinearities of the material, as well as photonic circuits embedding various functionalities ranging from polarizing beamsplitters to Mach-Zehnder interferometers, modulators and tunable filters. We then present several realizations of quantum state engineering enabled by these recent advances and discuss open perspectives and remaining challenges in the field of integrated quantum photonics with AlGaAs.
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