Rydberg-based two-qubit gate fidelities in neutral atom arrays are limited chiefly by laser intensity inhomogeneity and by detuning errors from frequency miscalibration, background-field drift, intermediate state light shift and Doppler shifts. Quantum optimal control can suppress the former, but no pulse can render a controlled-Z gate first-order insensitive to detuning. Here we show that this obstruction can be circumvented by designing Rydberg gate pulses with every leading-order detuning error relegated to single-qubit Z-rotations, which an echoed sequence removes. The resulting maximally-entangling ZZ gate has no leading-order response to arbitrary detunings on either atom, maintaining an infidelity below $10^{-3}$ within a much wider range of single-atom detunings than the time-optimal gates. We further show that a large fraction of residual error is dominated by population outside the computational subspace, which can be converted into heralded erasures. Our results significantly reduce the requirements on laser frequency stability and intensity homogeneity, field calibration and atomic temperature toward practical fault-tolerant quantum computing with neutral atoms.
Rydberg entangling gates driven by a two-photon transition in alkali atoms suffer from an adverse scaling of light-shift-induced errors. Robustness to such detuning errors is known to be impossible to achieve in the design of conventional Rydberg gate protocols, where only one of the qubit states is coupled to the Rydb...
Elie Bataille, Gyohei Nomura, Manuel Endres· 0 citations
Ensemble nitrogen-vacancy (NV) centers are widely used for quantum sensing and magnetometry, where performance depends on the accurate implementation of microwave pulse sequences. In these systems, inhomogeneous broadening and short coherence times limit reliable multi-pulse control, while hardware imperfections and of...
Ankita Chakravarty, Arnaud Carignan-Dugas, E. Dupont-Ferrier et al.· 0 citations
Microwave-induced couplings to nearby Rydberg levels are usually regarded as a source of gate imperfections in neutral-atom quantum processors. Here we show that the same mechanism can instead be exploited as a metrological resource for microwave electrometry. We consider a laser-driven Rydberg controlled-
Z
gate...
Y.-X. Song, C.-Z. Cao, G.-Q. Qin et al.· Chinese Physics B· 0 citations
Recently, neutral atom arrays have become known for their promising potential in quantum information processing. High-fidelity entangling operations are typically achieved by exciting atoms to high-lying Rydberg states through two-photon processes. To improve the performance of these systems at the hardware level, dual...
Rydberg atomic quantum receivers (RAQRs) recently gained significant interest. However, their impairments characterisation, which is critical for practical deployments, remains under-examined. In this paper, we evaluate how deviations in five operational parameters (atomic density, EIT linewidth, local oscillator (LO)...
Ainara Kazymova, Tie-Rui Gong, Yong-Liang Guan et al.· IEEE International Symposium...· 0 citations
We propose a Bell-measurement node for quantum repeaters based on a planar semiconductor microcavity operating in the strong-coupling regime. Cavity photons hybridize with quantum-well excitons to form polaritons combining properties of photons and matter quasiparticles. A control photon loaded into one polariton mode...
Jun-Hui Cao, Alexey Kavokin· 0 citations
We use cookies to run the site and, with your consent, for analytics and to show ads.
See our Cookie Policy.
