Quantum information processing (QIP) relies on high-fidelity quantum state preparation and precise unitary operations; however, practical realizations face major challenges, as the permissible error per operation must remain below the fault-tolerant threshold, typically on the order of 10−3 to 10−2 in most quantum systems. Integrated photonic circuits are a leading platform for scalable QIP technologies, yet unavoidable fabrication imperfections and control inaccuracies often limit operational fidelities, preventing the realization of large-scale quantum circuits. Even small systematic errors can degrade fidelity below the fault-tolerant threshold. A powerful approach for mitigating such errors is the composite segmentation method, originally inspired by techniques from nuclear magnetic resonance, where operations are carefully divided into segments with tailored parameters to enhance robustness. However, traditional composite techniques rely on complex-valued parameter control, whereas integrated photonic systems inherently support only real-valued parameters, making direct application of these methods not just challenging but fundamentally infeasible without new design strategies. In this talk, I will present the detuning-modulated composite segmentation method recently developed in my lab, which enables robust quantum operations in integrated photonic platforms without requiring complex phase control. This approach corrects a wide range of errors and achieves fidelities surpassing the fault-tolerant threshold. I will share our recent numerical and experimental results demonstrating how detuning-modulated composite segmentation dramatically enhances error tolerance and achieves superior robustness in single-photon quantum gates, such as high-fidelity Hadamard gates, as well as in two-photon entangling gates within integrated quantum circuits. Our approach opens a new path toward scalable and fault-tolerant quantum integrated photonic technologies.

Haim Suchowski is a professor in the Department of Condensed Matter Physics at the School of Physics and Astronomy, Tel Aviv University. He completed his postdoctoral research at the University of California, Berkeley (2014) after earning his M.Sc. and Ph.D. at the Weizmann Institute of Science (2011). He holds a B.A. in Physics (2004) and a B.Sc. in Electrical Engineering (2004), both from Tel Aviv University. His research focuses on ultrafast dynamics in condensed matter systems and nanostructures, silicon photonics, and two-dimensional materials. His group also investigates quantum coherent control using ultrashort laser pulses, as well as novel control schemes in quantum integrated photonics and nonlinear optics. In addition to leading a vibrant research group, he actively collaborates with international partners at the interface of ultrafast photonics and quantum technologies. Prof. Suchowski holds more than 20 patents and is the co-founder of 3DOptix, a cloud-based optical simulation platform, as well as two stealth companies: Quantum Pulse, focused on robust integrated quantum photonics, and a second venture developing mid-infrared imaging in silicon via robust nonlinear upconversion. He is the recipient of several awards, including the Fulbright Postdoctoral Fellowship, the Alon Young Investigator Award, and an ERC grant for his project "MIRAGE 20-15".