Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation: Part I
ORAL
Abstract
Superconducting qubits are an attractive candidate for building quantum information processors. However, existing control techniques do not scale well to large multi-qubit arrays. A promising candidate for scalable control is the Single Flux Quantum (SFQ) digital logic family. In an initial single-chip implementation, the fidelity of SFQ-based qubit gates was limited by quasiparticle (QP) poisoning of the qubit. QP excitations created from the operation of the SFQ circuitry can be a source of decoherence and temporal instability in the qubit. In order to suppress QP poisoning, 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 structures and compare with earlier measurements on single-chip implementations of SFQ-based qubit control. We also discuss strategies for further mitigation of QP poisoning, including superconducting bandgap engineering.
*Prepared in part by LLNL under Contract DE-AC52-07NA27344
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Presenters
Andrew Ballard
Syracuse University
Authors
Andrew Ballard
Syracuse University
Vito M Iaia
Syracuse University
Tianna A. McBroom
Syracuse University
Yebin Liu
Syracuse University
Kenneth Dodge
Syracuse University
Jaseung Ku
Syracuse University
Chuan-Hong Liu
University of Wisconsin-Madison
Alexander M Opremcak
University of Wisconsin - Madison
University of Wisconsin-Madison
Chris Wilen
University of Wisconsin - Madison
University of Wisconsin-Madison
Edward M Leonard
University of Wisconsin - Madison
University of Wisconsin-Madison
Northrop Grumman - Mission Systems
Matthew A Beck
University of Wisconsin - Madison
University of Wisconsin-Madison
Sohair Abdullah
University of Wisconsin - Madison
University of Wisconsin-Madison
Jonathan L DuBois
Lawrence Livermore National Laborator
Lawrence Livermore National Lab
Lawrence Livermore Natl Lab
Physics Division, Lawrence Livermore National Laboratory
Dan Schmidt
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
Tammy Lucas
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
Michael R Vissers
National Institute of Standards and Technology Boulder
John Biesecker
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
David Olaya
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
Manuel Castellanos-Beltran
National Institute of Standards and Technology Boulder
Peter Hopkins
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology
National Institute of Standards and Technologies
Joel N Ullom
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
Samuel P Benz
National Institute of Standards and Technology Boulder
