US 12,412,112 B2
Improving quantum gate infidelity in trapped ion quantum computers
Ming Li, Silver Spring, MD (US); Kenneth Wright, Berwyn Heights, MD (US); Neal C. Pisenti, Laurel, MD (US); Kristin Marie Beck, Livermore, CA (US); Jason Hieu Van Nguyen, Hyattsville, MD (US); and Yunseong Nam, North Bethesda, MD (US)
Assigned to IONQ, INC., College Park, MD (US)
Filed by IONQ, INC., College Park, MD (US)
Filed on Sep. 16, 2021, as Appl. No. 17/477,148.
Claims priority of provisional application 63/083,469, filed on Sep. 25, 2020.
Prior Publication US 2024/0403678 A1, Dec. 5, 2024
Int. Cl. G06N 10/20 (2022.01); G06N 10/40 (2022.01); G06N 10/70 (2022.01)
CPC G06N 10/20 (2022.01) [G06N 10/40 (2022.01); G06N 10/70 (2022.01)] 17 Claims
OG exemplary drawing
 
1. A method of performing a quantum gate operation in an ion trap quantum computing system, comprising:
identifying one or more error mechanisms that cause a quantum computational error in a quantum gate operation on a first trapped ion of an ion chain comprising a plurality of trapped ions, wherein the quantum gate operation is performed by applying a first Raman laser beam and a second Raman laser beam that are configured to cause a Raman transition in the first trapped ion in the ion chain and a coupling between the first trapped ion and one or more axial motional modes of the ion chain;
measuring a temperature of an axial motional mode of the ion chain;
computing a first amplitude of the first Raman laser beam, and a second amplitude of the second Raman laser beam such that the effect of the identified one or more error mechanisms is accounted for; and
applying the first Raman laser beam having the computed first amplitude and the second Raman laser beam having the computed second amplitude on the first trapped ion to perform the quantum gate operation on the first trapped ion,
wherein the first and second amplitudes are computed based on the measured temperature of the axial motional mode of the ion chain.