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Generation of high-fidelity quantum control methods for multilevel systems

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journal contribution
posted on 2023-06-09, 15:48 authored by J Randall, A M Lawrence, S C Webster, Sebastian WeidtSebastian Weidt, N V Vitanov, Winfried HensingerWinfried Hensinger
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.


Quantum technology with nanofabricated ion trap chips; G0308; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/G007276/1

Army Research Laboratory

Bulgarian Science Fund Grant

UK Quantum Technology Hub for Sensors and Metrology; G1511; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/M013294/1

US Army Research Office

Integrated Quantum Information Technology; G0650; EUROPEAN UNION; GA 270843

The University of Sussex

UK Quantum Technology Hub: NQIT-Networked Quantum Information Technologies; G1503; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/M013243/1


Publication status

  • Published

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  • Published version


Physical Review A




American Physical Society





Page range

043414 1-9

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Atomic, Molecular and Optical Physics Research Group Publications

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  • Yes

Peer reviewed?

  • Yes

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