Experimental Characterization of Crosstalk Errors with Simultaneous Gate Set Tomography

Crosstalk is a leading source of failure in multiqubit quantum information processors. It can arise from a wide range of disparate physical phenomena, and can introduce subtle correlations in the errors experienced by a device. Several hardware characterization protocols are able to detect the prese...

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Bibliographic Details
Published in:PRX quantum 2021-11, Vol.2 (4), p.040338, Article 040338
Main Authors: Rudinger, Kenneth, Hogle, Craig W., Naik, Ravi K., Hashim, Akel, Lobser, Daniel, Santiago, David I., Grace, Matthew D., Nielsen, Erik, Proctor, Timothy, Seritan, Stefan, Clark, Susan M., Blume-Kohout, Robin, Siddiqi, Irfan, Young, Kevin C.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Quantum tomography
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Summary:Crosstalk is a leading source of failure in multiqubit quantum information processors. It can arise from a wide range of disparate physical phenomena, and can introduce subtle correlations in the errors experienced by a device. Several hardware characterization protocols are able to detect the presence of crosstalk, but few provide sufficient information to distinguish various crosstalk errors from one another. In this article we describe how gate set tomography, a protocol for detailed characterization of quantum operations, can be used to identify and characterize crosstalk errors in quantum information processors. Furthermore, we demonstrate our methods on a two-qubit trapped-ion processor and a two-qubit subsystem of a superconducting transmon processor.
ISSN:2691-3399
2691-3399
DOI:10.1103/PRXQuantum.2.040338