High-fidelity Rydberg-blockade entangling gate using shaped, analytic pulses

TL;DR

This paper demonstrates that shaped, analytic pulses significantly enhance the fidelity and speed of Rydberg blockade two-qubit gates, achieving near-perfect entanglement in 50 ns at room temperature.

Contribution

The authors introduce an analytical approach using DRAG pulses and optimal Rydberg blockade to improve gate fidelity and speed beyond previous methods.

Findings

Achieved Bell state fidelity >0.9999 at 300 K

Gate time of 50 ns, an order of magnitude faster

Enhanced fidelity by several orders compared to square pulses

Abstract

We show that the use of shaped pulses improves the fidelity of a Rydberg blockade two-qubit entangling gate by several orders of magnitude compared to previous protocols based on square pulses or optimal control pulses. Using analytical Derivative Removal by Adiabatic Gate (DRAG) pulses that reduce excitation of primary leakage states and an analytical method of finding the optimal Rydberg blockade we generate Bell states with a fidelity of $F>0.9999$ in a 300 K environment for a gate time of only $50\;{\rm ns}$, which is an order of magnitude faster than previous protocols. These results establish the potential of neutral atom qubits with Rydberg blockade gates for scalable quantum computation.