Generation of high-fidelity quantum control methods for multilevel systems

Randall, J, Lawrence, A M, Webster, S C, Weidt, S, Vitanov, N V and Hensinger, W K (2018) Generation of high-fidelity quantum control methods for multilevel systems. Physical Review A, 98 (4). 043414 1-9. ISSN 1050-2947

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In recent decades there has been a rapid development of methods to experimentally control individual quantum systems. A broad range of quantum control methods has been developed for two-level systems; however, the complexity of multilevel quantum systems make the development of analogous control methods extremely challenging. Here we exploit the equivalence between multilevel systems with SU(2) symmetry and spin-1/2 systems to develop a technique for generating new robust, high-fidelity, multilevel control methods. As a demonstration of this technique, we develop adiabatic and composite multilevel quantum control methods and experimentally realize these methods using a 171Yb+ ion system. We measure the average infidelity of the process in both cases to be around 10−4, demonstrating that this technique can be used to develop high-fidelity multilevel quantum control methods and can, for example, be applied to a wide range of quantum computing protocols, including implementations below the fault-tolerant threshold in trapped ions.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Depositing User: Alice Jackson
Date Deposited: 09 Nov 2018 10:22
Last Modified: 09 Nov 2018 10:22

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Project NameSussex Project NumberFunderFunder Ref
Quantum technology with nanofabricated ion trap chipsG0308EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/G007276/1
UK Quantum Technology Hub: NQIT-Networked Quantum Information TechnologiesG1503EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/M013243/1
UK Quantum Technology Hub for Sensors and MetrologyG1511EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/M013294/1
Integrated Quantum Information TechnologyG0650EUROPEAN UNIONGA 270843
Army Research LaboratoryUnsetUnsetUnset
US Army Research OfficeUnsetUnsetUnset
The University of SussexUnsetUnsetUnset
Bulgarian Science Fund GrantUnsetUnsetUnset