Superconducting Qubit Control with Single Flux Quantum Pulses in a Multi-chip Module
ORAL
Abstract
Conventional techniques for controlling superconducting qubits are challenging to extend to large multi-qubit arrays. A promising candidate for scalable control is the Single Flux Quantum (SFQ) digital logic family. In an initial monolithic implementation with qubits and SFQ elements on the same chip, the fidelity of SFQ-based qubit gates was limited by poisoning of the qubit from quasiparticles (QPs) generated by SFQ phase slips. In order to suppress poisoning from QP diffusion and the propagation of phonons generated by QP recombination, we have developed a multi-chip module with an SFQ driver on a classical control chip that is flip-chip coupled to a superconducting transmon qubit on a separate quantum chip. We characterize the QP poisoning in these devices for different qubit geometries, and we compare with earlier measurements on single-chip implementations of SFQ-based qubit control. We also discuss strategies for further mitigation of QP poisoning, including superconductor bandgap engineering.
*Prepared in part by LLNL under Contract DE-AC52-07NA27344
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Presenters
Andrew L Ballard
Syracuse University
Authors
Andrew L Ballard
Syracuse University
Vito M Iaia
Syracuse University
Tianna A McBroom
Syracuse University
Jaseung Ku
Syracuse University
Chuan-Hong Liu
University of Wisconsin Madison
University of Wisconsin- Madison
University of Wisconsin - Madison
University of Wisconsin-Madison
Alexander M Opremcak
University of Wisconsin - Madison
Chris D Wilen
University of Wisconsin - Madison
University of Wisconsin, Madison
Edward M Leonard
Northrop Grumman - Mission Systems
Matthew A Beck
IBM TJ Watson Research Center
Sohair Abdullah
University of Wisconsin - Madison
Jonathan L DuBois
Lawrence Livermore Natl Lab
David Olaya
National Institute of Standards and Technology Boulder; University of Colorado, Boulder
National Institute of Standards and Technology Boulder
John P Biesecker
National Institute of Standards and Technology Boulder
Adam J Sirois
National Institute of Standards and Technology Boulder
Dan Schmidt
National Institute of Standards and Technology Boulder
Joel N Ullom
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder; University of Colorado, Boulder
National Institute of Standards and Technology Boulder
Samuel P Benz
National Institute of Standards and Technology Boulder
Peter Hopkins
National Institute of Standards and Technology Boulder
