Qiskit Quantum Seminar

Currently Playing: Engineering Parametric Interactions Between Superconducting Circuits | Qiskit Seminar Series

Engineering Parametric Interactions Between Superconducting Circuits Your formal invite to weekly Qiskit videos ► https://ibm.biz/q-subscribe Speaker: Raymond W. Simmonds Host: Zlatko Minev, PhD. Abstract: Over 15 years ago, parametric coupling was proposed as a way to entangle flux qubits at their "sweet spots" with frequencies that were far detuned from each other. This was a possible solution to the difficulty with optimizing the spectrum of flux qubits that were extremely sensitivity to the variations in the critical current of their smallest fabricated Josephson junctions. After one major demonstration, this strategy was soon abandoned. In contrast, ion trap systems have always relied on parametric interactions that are naturally more flexible, allowing all-to-all tunable coupling between individual qubits. Over a decade ago, our group at NIST (in Boulder, CO) revived the parametric coupling strategy as a powerful tool for engineering interactions between superconducting circuits. In this talk, I will explain our parametric ideology and highlight our group's continued efforts to develop non-resonant, parametrically induced coupled interactions between transmon-based qubits and cavities to enable fast, high fidelity gate operations and measurements. Finally, I’ll discuss improving, connecting, and expanding these systems for constructing analog quantum simulators or processing quantum information. Bio: Dr. Raymond W. Simmonds received his B.A. (1995), M.S. (1999), and Ph.D. (2002) in Physics from the University of California, Berkeley with Dr. James (Seamus) C. Davis developing a He-3 Superfluid Quantum Interference Device (SQUID). From 2002-2004, Dr. Simmonds was a NRC Postdoctoral fellow with Dr. John Martinis at NIST, Boulder, developing two coupled superconducting phase qubits. Dr. Simmonds joined the NIST faculty as a Physicist in 2004 and was Project Leader from 2012-2014, but has since moved back to the bench as an experimental physicist in the Advanced Microwave Photonics Group in the Applied Physics Division of the Physical Measurement Laboratory (PML) at NIST, Boulder CO. He currently pursues research towards developing Quantum Information Technology with superconducting circuits. His main research focuses on utilizing parametric coupling with superconducting quantum bits and cavities to improve the speed and fidelity of quantum operations and to provide fast, high fidelity qubit measurements. Notable career achievements include: discovered two-level system (TLS) defects in Josephson tunnel barriers within superconducting qubits (2003), demonstrated coupled phase qubits via simultaneous state measurement (2005), demonstrated first quantum bus/memory with superconducting circuits (2007), developed remote sensing and control of superconducting qubits with a self-aligning flip-chip technology (2010), developed SQUID based tunable couplers (2010-present), developed vacuum-gap capacitors and cross-overs (2010), which led to strong-coupling circuit cavity electro-mechanics (2011-present), designed microwave-to-optical quantum transducers in collaboration with NIST/JILA (2014-present), and developed parametric coupling of superconducting qubits, resonators, and electro-mechanics (2008-present). -- The Qiskit Seminar Series is a deep dive into various academic and research topics within the quantum community. It will feature community members and leaders every Friday, 12 PM EDT.