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- W3128794969 abstract "The key to realizing fault-tolerant quantum computation for semiconductor quantum-dot singlet-triplet (ST) qubits is to operate both the single- and two-qubit gates with high fidelity. The feasible way includes operating the qubit near the transverse sweet spot (TSS) to reduce the leading order of the noise, as well as adopting the merit of the global property of the geometric phase. Here, we propose the implementation of the universal geometric gates for the ST qubits in the double quantum dot (DQD). The single-qubit non-cyclic geometric gate which is using the non-cyclic evolution path of the state to obtain the geometric phase can be achieved via introducing the AC-driven detuning operating near the TSS. We perform numerical simulation under the realistic $1/f$ noise environment in DQD. We find that the non-cyclic geometric gate can surpass its dynamical counterpart with a relatively high fidelity of 99.81%. Meanwhile, we have used the dipole coupling between the DQDs and the cavity resonator which is maximized at the TSS to construct the geometric (holonomic) entangling geometric gate. We have shown that the fidelity for this two-qubit gate can be as high as 99.63%. Our results suggests that taking advantage of the non-cyclic geometric gates together with using the TSS can be effective to obtain high-fidelity ST qubits." @default.
- W3128794969 created "2021-02-15" @default.
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- W3128794969 date "2021-01-31" @default.
- W3128794969 modified "2023-09-27" @default.
- W3128794969 title "Implementation of high-fidelity geometric singlet-triplet qubits operating near the transverse sweet spot" @default.
- W3128794969 hasPublicationYear "2021" @default.
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