Single Temporal-Pulse-Modulated Parameterized Controlled-Phase Gate for Rydberg Atoms

Li, X .X.; Shao, X. Q.; Li, Weibin

Abstract

We propose an adiabatic protocol for implementing a controlled-phase gate CZθ with continuous θ of neutral atoms through a symmetrical two-photon excitation process via the second resonance line, 6P in 87Rb, with a single-temporal-modulation-coupling of the ground state and intermediate state. Relying on different adiabatic paths, the phase factor θ of the CZθ gate can be accumulated on the logic qubit state |11| alone by calibrating the shape of the temporal pulse where strict zero amplitudes at the start and end of the pulse are not needed. For a wide range of θ, we can obtain the fidelity of the CZθ gate over 99.7% in less than 1μs, in the presence of spontaneous emission from intermediate and Rydberg states. And in particular for θ=π, we benchmark the performance of the CZ gate by taking into account various experimental imperfections, such as Doppler shifts, fluctuation of Rydberg-Rydberg interaction strength, inhomogeneous Rabi frequency, and noise of driving fields, etc., and show that the predicted fidelity is able to maintain at about 98.4% after correcting the measurement error. This gate protocol provides a robustness against the fluctuation of pulse amplitude and a flexible way for adjusting the entangling phase, which may contribute to the experimental implementation of near-term noisy intermediate-scale quantum computation and algorithm with neutral-atom systems.

Citation

Li, X. .., Shao, X. Q., & Li, W. (2022). Single Temporal-Pulse-Modulated Parameterized Controlled-Phase Gate for Rydberg Atoms. Physical Review Applied, 18(4), Article 044042. https://doi.org/10.1103/PhysRevApplied.18.044042

• Journal Article Type: Article
• Acceptance Date: Sep 8, 2022
• Online Publication Date: Oct 18, 2022
• Publication Date: Oct 18, 2022
• Deposit Date: Sep 8, 2022
• Publicly Available Date: Oct 18, 2022
• Journal: Physical Review Applied
• Electronic ISSN: 2331-7019
• Peer Reviewed: Peer Reviewed
• Volume: 18
• Issue: 4
• Article Number: 044042
• DOI: https://doi.org/10.1103/PhysRevApplied.18.044042
• Keywords: General Physics and Astronomy
• Public URL: https://nottingham-repository.worktribe.com/output/10918171
• Publisher URL: https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.18.044042