arXiv subjects

Wan-Xia Li

Publications and source records attributed to Wan-Xia Li.

3 recordsLinked to original sources

arXiv2023

High-tolerance antiblockade SWAP gates using optimal pulse drivings

Position error is treated as the leading obstacle that prevents Rydberg antiblockade gates from being experimentally realizable, because of the inevitable fluctuations in the relative motion between two atoms invalidating the antiblockade condition. In this work we report progress towards a high-tolerance antiblockade-based Rydberg SWAP gate enabled by the use of {\it modified} antiblockade condition combined with carefully-optimized laser pulses. Depending on the optimization of diverse pulse shapes our protocol shows that the amount of time-spent in the double Rydberg state can be shortened by more than $70\%$ with respect to the case using {\it perfect} antiblockade condition, which significantly reduces this position error. Moreover, we benchmark the robustness of the gate via taking account of the technical noises, such as the Doppler dephasing due to atomic thermal motion, the fluctuations in laser intensity and laser phase and the intensity inhomogeneity. As compared to other existing antiblockade-gate schemes the predicted gate fidelity is able to maintain at above 0.91 after a very conservative estimation of various experimental imperfections, especially considered for realistic interaction deviation of $δV/V\approx 5.92\%$ at $T\sim20$ $μ$K. Our work paves the way to the experimental demonstration of Rydberg antiblockade gates in the near future.

quant-ph↗

arXiv2021

Cross sections for 2-to-1 meson-meson scattering

We study the processes $K\bar{K} \to ϕ$, $πD \to D^\ast$, $π\bar{D} \to \bar{D}^\ast$, and the production of $ψ(3770)$, $ψ(4040)$, $ψ(4160)$, and $ψ(4415)$ mesons in collisions of charmed mesons or charmed strange mesons. The process of 2-to-1 meson-meson scattering involves a quark and an antiquark from the two initial mesons annihilating into a gluon and subsequently the gluon being absorbed by the spectator quark or antiquark. Transition amplitudes for the scattering process derive from the transition potential in conjunction with mesonic quark-antiquark wave functions and the relative-motion wave function of the two initial mesons. We derive these transition amplitudes in the partial wave expansion of the relative-motion wave function of the two initial mesons so that parity and total-angular-momentum conservation are maintained. We calculate flavor and spin matrix elements in accordance with the transition potential and unpolarized cross sections for the reactions using the transition amplitudes. Cross sections for the production of $ψ(4040)$, $ψ(4160)$, and $ψ(4415)$ relate to nodes in their radial wave functions. We suggest the production of $ψ(4040)$, $ψ(4160)$, and $ψ(4415)$ as probes of hadronic matter that results from the quark-gluon plasma created in ultrarelativistic heavy-ion collisions.

hep-ph↗

arXiv2020

Cross sections for 2-to-3 meson-meson scattering

We study 2-to-3 meson-meson scattering based on the process that a gluon is created from a constituent quark or antiquark and subsequently the gluon creates a quark-antiquark pair. The transition potential for the process is derived in QCD. Eight Feynman diagrams at tree level are involved in the 2-to-3 meson-meson scattering. Starting from the $S$-matrix element, we derive the unpolarized cross section from the eight transition amplitudes corresponding to the eight Feynman diagrams. The transition amplitudes contain color, spin, and flavor matrix elements. The 2-to-3 meson-meson scattering includes $ππ\to πK\bar{K}$, $πK \to ππK$, $πK \to KK\bar{K}$, $KK \to πKK$, and $K\bar{K} \to πK\bar{K}$. Cross sections for the reactions are calculated. The cross sections depend on temperature obviously, and the cross section for $πK \to ππK$ for total isospin $I=3/2$ at zero temperature is compared to experimental data. By comparison with inelastic 2-to-2 meson-meson scattering, we find that 2-to-3 meson-meson scattering may be as important as inelastic 2-to-2 meson-meson scattering.

hep-ph↗