Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 16: Superconducting Qubits (joint session QI/TT)
QI 16.6: Talk
Wednesday, March 20, 2024, 10:45–11:00, HFT-FT 131
Embedded Amplifier for Efficient Superconducting Qubit Readout — •Lindsay Orr1,2, Benton Miller3,4, Florent Lecocq3,5, and Anja Metelmann1 — 1Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 3National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA — 4Department of Physics, University of Colorado, Boulder, Colorado 80309, USA — 5Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, USA
High fidelity qubit readout is a cornerstone of quantum computing. In superconducting architecture, this is typically achieved by routing signals from a readout cavity to a parametric amplifier via microwave circulators. The use of these off-chip components enables the independent design and optimization of the readout cavity and parametric amplifier. However, the intrinsic losses and large magnetic fields of these circulators reduces measurement efficiency and inhibits scalability. Our strategy to circumvent this is to perform the amplification and signal routing directly on-chip, by coupling a transmon qubit to a nonreciprocal multimode parametric system. As a consequence of this, the qubit and amplifier become a single open quantum system with a large Hilbert space. In this talk, we will discuss the theoretical challenges in understanding the quantum dynamics, focusing on extracting qubit measurement and dephasing rates.