Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D36: Quantum Control: Quantum Gates
3:00 PM–5:48 PM,
Monday, March 14, 2022
Room: McCormick Place W-194A
Sponsoring
Unit:
DQI
Chair: Sara Sussman, Princeton
Abstract: D36.00014 : Halving ion-trap two-qubit gate time while enhancing frequency-drift robustness
5:36 PM–5:48 PM
Presenter:
Seyed Shakib Vedaie
(University of Calgary)
Authors:
Seyed Shakib Vedaie
(University of Calgary)
Eduardo Paez
(University of Calgary)
Barry C Sanders
(University of Calgary)
an Autler-Townes shift, off-resonant transitions, photon scatterings, laser-power fluctuations, motional heating, cross-Kerr phonon coupling and laser spillover with no fitting parameters. To minimize τ, while maintaining fixed gate fidelity, we articulate and solve the feasibility problem: given the seven-ion master equation with all ions prepared in the ground state and given vibrational modes initially in a ∼μK thermal state, and with the target being two of the ions evolving over time τ into a Bell state, and subject to a strict upper bound on laser power, design an amplitude-modulated Raman laser pulse that deterministically yields a close approximation to this Bell state. We solve our problem by global optimization and obtain a pulse sequence that executes in half the time required by state-of-the-art methods. Our pulse is robust against long-term drift in the frequency detuning and an imperfect initial motional ground state.
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