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

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

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X .X. Li

X. Q. Shao

Associate Professor


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.


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.

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
Keywords General Physics and Astronomy
Public URL
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