Crosstalk Suppression for Fault-tolerant Quantum Error Correction with Trapped Ions
RWTH Publications (RWTH Aachen)
Abstract
Physical qubits in experimental quantum information processors are inevitably exposed to different sources of noise and imperfections, which lead to errors that typically accumulate hindering our ability to perform long computations reliably.Progress towards scalable and robust quantum computation relies on exploiting quantum error correction (QEC) to actively battle these undesired effects.In this work, we present a comprehensive study of crosstalk errors in a quantumcomputing architecture based on a single string of ions confined by a radio-frequency trap, and manipulated by individuallyaddressed laser beams.This type of errors affects spectator qubits that, ideally, should remain unaltered during the application of single-and two-qubit quantum gates addressed at a different set of active qubits.We microscopically model crosstalk errors from first principles and present a detailed study showing the importance of using a coherent vs incoherent error modelling and, moreover, discuss strategies to actively suppress this crosstalk at the gate level.Finally, we study the impact of residual crosstalk errors on the performance of fault-tolerant QEC numerically, identifying the experimental target values that need to be achieved in near-term trapped-ion experiments to reach the break-even point for beneficial QEC with low-distance topological codes.
Authors 4
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Affiliation as printed
Department of Physics , College of Science , Swansea University , Singleton Park , Swansea SA2 8PP , United Kingdom
Department of Physics, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom
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Affiliation as printed
Department of Physics , College of Science , Swansea University , Singleton Park , Swansea SA2 8PP , United Kingdom
Honeywell Quantum Solutions , 303 S. Technology Ct. , Broomfield , Colorado 80021 , USA
Department of Physics, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom
Honeywell Quantum Solutions, 303 S. Technology Ct., Broomfield, Colorado 80021, USA
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Universidad Complutense de Madrid
Affiliation as printed
Departamento de Física Teórica , Universidad Complutense , 28040 Madrid , Spain
Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Institute for Theoretical Nanoelectronics (PGI-2) , Forschungszentrum Jülich , 52428 Jülich , Germany
JARA-Institute for Quantum Information , RWTH Aachen University , 52056 Aachen , Germany
Institute for Theoretical Nanoelectronics (PGI-2), Forschungszentrum Jülich, 52428 Jülich, Germany
JARA-Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany