Author:
Erhard Alexander,Wallman Joel J.,Postler Lukas,Meth Michael,Stricker Roman,Martinez Esteban A.,Schindler Philipp,Monz Thomas,Emerson Joseph,Blatt Rainer
Abstract
AbstractQuantum computers promise to solve certain problems more efficiently than their digital counterparts. A major challenge towards practically useful quantum computing is characterizing and reducing the various errors that accumulate during an algorithm running on large-scale processors. Current characterization techniques are unable to adequately account for the exponentially large set of potential errors, including cross-talk and other correlated noise sources. Here we develop cycle benchmarking, a rigorous and practically scalable protocol for characterizing local and global errors across multi-qubit quantum processors. We experimentally demonstrate its practicality by quantifying such errors in non-entangling and entangling operations on an ion-trap quantum computer with up to 10 qubits, and total process fidelities for multi-qubit entangling gates ranging from $$99.6(1)\%$$99.6(1)% for 2 qubits to $$86(2)\%$$86(2)% for 10 qubits. Furthermore, cycle benchmarking data validates that the error rate per single-qubit gate and per two-qubit coupling does not increase with increasing system size.
Funder
Austrian Science Fund
Österreichische Forschungsförderungsgesellschaft
ODNI | Intelligence Advanced Research Projects Activity
United States Department of Defense | United States Army | U.S. Army Research, Development and Engineering Command | Army Research Office
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
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