A pulse sequence designed for robust C-phase gates in SiMOS and Si/SiGe double quantum dots

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dc.contributor.authorGüngördü, Utkan
dc.contributor.authorKestner, J. P.
dc.date.accessioned2018-09-21T19:11:12Z
dc.date.available2018-09-21T19:11:12Z
dc.description.abstractWe theoretically analyze the errors in one- and two-qubit gates in SiMOS and Si/SiGe spin qubit experiments, and present a pulse sequence which can suppress the errors in exchange coupling due to charge noise using ideal local rotations. In practice, the overall fidelity of the pulse sequence will be limited only by the quality of the single-qubit gates available: the C-phase infidelity comes out to be ≈2.5× the infidelity of the single-qubit operations. Based on experimental data, we model the errors and show that C-phase gate infidelities can be suppressed by two orders in magnitude. Our pulse sequence is simple and we expect an experimental implementation would be relatively straightforward. We also evaluate the performance of this gate against 1/f noise. Assuming a soft ultraviolet cutoff, we show that the pulse sequence designed for quasistatic noise still performs well when the cutoff occurs below ∼1 MHz given fast enough one-qubit Rabi frequencies, suppressing the infidelity by an order of magnitude compared to the existing direct adiabatic protocol. We also analyze the effects of nonadiabaticity during finite rise periods, and find that adiabaticity is not a limitation for the current values of exchange coupling.en_US
dc.description.urihttps://arxiv.org/abs/1806.01262en_US
dc.format.extent12 pagesen_US
dc.genrejournal artice pre-printen_US
dc.identifierdoi:10.13016/M2DV1CS07
dc.identifier.urihttp://hdl.handle.net/11603/11353
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjectqubit gatesen_US
dc.subjectSiMOSen_US
dc.subjectSi/SiGe spin qubiten_US
dc.subjectdirect adiabatic protocolen_US
dc.subjectpulse sequence which can suppress the errors in exchange coupling
dc.subjectideal local rotations
dc.subjectC-phase infidelity
dc.subjectpulse sequence designed for quasistatic noise
dc.titleA pulse sequence designed for robust C-phase gates in SiMOS and Si/SiGe double quantum dotsen_US
dc.typeTexten_US

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