AEP Special Seminar: Dr. Haim Suchowski, Tel Aviv University

Detuning-modulated composite scheme for high-fidelity quantum integrated photonics Dr. Haim Suchowski, Associate Professor, Department of Condensed Matter Physics, School of Physics and Astronomy, Tel Aviv University
Abstract:
Quantum information processing (QIP) relies on high-fidelity quantum state preparation and accurate unitary operations; this presents a challenge in practical realizations where the permissible error of quantum operations is smaller than 103. Thus, even minor systematic errors, i.e., due to imperfections in fabrication or the experimental control knobs, reduce the fidelity of state transfer below the fault-tolerant threshold. A powerful tool to correct such errors is composite pulses (CPs), which are a sequence of pulses with different areas or phases that implement accurate and robust quantum gates. While these traditional CPs were developed in the field of nuclear magnetic resonance, these are not applicable to correct unavoidable fabrication errors in Integrated photonic circuits. This is mainly because existing sequences require control of the coupling phase, which is a real-valued parameter in integrated photonics. Also, current solutions do not account for the stochastic nature of fabrication noise.

In our research, we introduce the detuning-modulated composite control method that offers a robust QIP for integrated photonic systems. The scheme allows the correction of errors in various parameters, achieving fidelity above the QI threshold 103. In my talk, I will introduce the scheme and share with you our recent numerical and experimental achievements in integrated photonic circuits, where detuning-modulated CPs obtain remarkable error tolerance in qubit inversions as well as accurate unitary operations for single and two-qubit operations, promising for advancing QIP technologies due to their scalability and on-chip integration capacity. Speaker Bio: Haim Suchowski performed postdoctoral research at the University of California, Berkeley (2014), received the Fulbright postdoctoral fellowship, and was awarded the ERC grant for his project “MIRAGE 20-15.” He received his M.Sc and Ph.D. from the Weizmann Institute of Science (2011), and a B.A. in physics (2004) and a B.Sc. in electrical engineering (2004) from Tel Aviv University. His research explores ultrafast dynamics in condensed matter physics and nanostructures, silicon photonics and 2D materials. His group also performs research in quantum coherent control of atoms and molecules with ultra-short laser pulses and control schemes in quantum-integrated photonics and nonlinear optics. Hosted by Jeffrey Moses