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- W3217314701 abstract "Geometric phases accompanying adiabatic quantum evolutions can be used to construct robust quantum control for quantum information processing due to their noise-resilient feature. A significant development along this line is to construct geometric gates using nonadiabatic quantum evolutions to reduce errors due to decoherence. However, it has been shown that nonadiabatic geometric gates are not necessarily more robust than dynamical ones, in contrast to an intuitive expectation. Here we experimentally investigate this issue for the case of nonadiabatic holonomic quantum computation (NHQC) and show that conventional NHQC schemes cannot guarantee the expected robustness due to a cross-coupling to the states outside the computational space. We implement a different set of constraints for gate construction in order to suppress such cross-coupling to achieve an enhanced robustness. Using a superconducting quantum circuit, we demonstrate high-fidelity holonomic gates whose infidelity against quasistatic transverse errors can be suppressed up to the fourth order, instead of the second order in conventional NHQC and dynamical gates. In addition, we explicitly measure the accumulated dynamical phase due to the abovementioned cross-coupling and verify that it is indeed much reduced in our NHQC scheme. We further demonstrate a protocol for constructing two-qubit NHQC gates also with an enhanced robustness." @default.
- W3217314701 created "2021-12-06" @default.
- W3217314701 creator A5005688217 @default.
- W3217314701 creator A5012704417 @default.
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- W3217314701 creator A5084588587 @default.
- W3217314701 date "2021-12-01" @default.
- W3217314701 modified "2023-10-14" @default.
- W3217314701 title "Superrobust Geometric Control of a Superconducting Circuit" @default.
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- W3217314701 doi "https://doi.org/10.1103/physrevapplied.16.064003" @default.