Reaching fast and robust two-qubit gates with low infidelities has been an outstanding challenge for the long-term goal of useful quantum computers. Typically, optimizing the pulse shapes can minimize the gate infidelity and improve its robustness to certain types of errors; yet it remains incapable of speeding up the gate execution time which is fundamentally restricted by the attainable Rabi frequency in a realistic setup. In this work, we develop a fast implementation of two-qubit CZ gates using optimized ancillary drive to enhance the two-photon Rabi frequency between the ground and Rydberg states.This ancillary drive can work in an error-robustness framework without increasing the original gate infidelity in the absence of the drive. Considering the experimentally feasible parameters for $^{87}$ Rb atoms, we demonstrate that the execution time required for such CZ gates can be shortened by more than 30 $\%$ as compared to standard two-photon protocols arising the gate fidelity above 0.9954 by taking account of all relevant error sources. Our results reduce the high-power laser requirement and unlock the potential toward fast, high-fidelity quantum operations for large-scale quantum computation with neutral atoms.Reaching fast and robust two-qubit gates with low infidelities has been an outstanding challenge for the long-term goal of useful quantum computers. Typically, optimizing the pulse shapes can minimize the gate infidelity and improve its robustness to certain types of errors; yet it remains incapable of speeding up the gate execution time which is fundamentally restricted by the attainable Rabi frequency in a realistic setup. In this work, we develop a fast implementation of two-qubit CZ gates using optimized ancillary drive to enhance the two-photon Rabi frequency between the ground and Rydberg states.This ancillary drive can work in an error-robustness framework without increasing the original gate infidelity in the absence of the drive. Considering the experimentally feasible parameters for $^{87}$Rb atoms, we demonstrate that the execution time required for such CZ gates can be shortened by more than 30$\%$ as compared to standard two-photon protocols arising the gate fidelity above 0.9954 by taking account of all relevant error sources. Our results reduce the high-power laser requirement and unlock the potential toward fast, high-fidelity quantum operations for large-scale quantum computation with neutral atoms.

quant-pharXiv:2602.21512Feb 26, 20260 citations

Fast Rydberg gates without dipole blockade via quantum control

Marco Cozzini, Tommaso Calarco, Alessio Recati +1 more

arXiv:quant-ph/0511118Optics CommunicationsJun 16, 200620 citations

Asymmetric and fast Rydberg gate protocol for entanglement outside of the blockade regime

Anonymous, Vikas Buchemmavari, Mark E. Saffman

Physical Review AJul 13, 20262 citations

Architecture for fast implementation of quantum low-density parity-check codes with optimized Rydberg gates

C. Poole, Trent Graham, Michael A. Perlin +2 more

We propose an implementation of bivariate bicycle codes [S. Bravyi et al., Nature (London) 627, 778 (2024)] based on long-range Rydberg gates between stationary neutral atom qubits. An optimized layout of data and ancilla qubits reduces the maximum Euclidean communication distance needed for nonlocal parity-check operators. An optimized Rydberg gate pulse design enables $\mathsf{CZ}$ entangling operations with fidelity $\mathcal{F}>0.999$ at a distance greater than $12\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{m}$. The combination of optimized layout and gate design leads to a quantum error correction cycle time of $\ensuremath{\sim}1.28\phantom{\rule{0.28em}{0ex}}\mathrm{ms}$ for a [[144,12,12]] code, which is nearly a factor-of-two improvement over previous designs.We propose an implementation of bivariate bicycle codes [S. Bravyi et al., Nature (London) 627, 778 (2024)] based on long-range Rydberg gates between stationary neutral atom qubits. An optimized layout of data and ancilla qubits reduces the maximum Euclidean communication distance needed for nonlocal parity-check operators. An optimized Rydberg gate pulse design enables $\mathsf{CZ}$ entangling operations with fidelity $\mathcal{F}>0.999$ at a distance greater than $12\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{m}$. The combination of optimized layout and gate design leads to a quantum error correction cycle time of $\ensuremath{\sim}1.28\phantom{\rule{0.28em}{0ex}}\mathrm{ms}$ for a [[144,12,12]] code, which is nearly a factor-of-two improvement over previous designs.

arXiv:2404.18809Physical Review AFeb 19, 202526 citations

^{87}

Rb atoms, we demonstrate that the execution time required for such CZ gates can be shortened by more than 30

\%

as compared to standard two-photon protocols arising the gate fidelity above 0.9954 by taking account of all relevant error sources. Our results reduce the high-power laser requirement and unlock the potential toward fast, high-fidelity quantum operations for large-scale quantum computation with neutral atoms.

\mathsf{CZ}

entangling operations with fidelity

\mathcal{F}>0.999

at a distance greater than $12\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{m}$. The combination of optimized layout and gate design leads to a quantum error correction cycle time of $\ensuremath{\sim}1.28\phantom{\rule{0.28em}{0ex}}\mathrm{ms}$ for a [[144,12,12]] code, which is nearly a factor-of-two improvement over previous designs.