US 11,726,387 B2
Trapped-ion entangling gates with bichromatic pair of microwave fields and magnetic field gradient
Robert Tyler Sutherland, Livermore, CA (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Feb. 6, 2020, as Appl. No. 16/783,875.
Claims priority of provisional application 62/924,628, filed on Oct. 22, 2019.
Prior Publication US 2021/0116784 A1, Apr. 22, 2021
Int. Cl. G02F 3/00 (2006.01); G06N 10/00 (2022.01)
CPC G02F 3/00 (2013.01) [G06N 10/00 (2019.01)] 19 Claims
OG exemplary drawing
 
1. A method of operating a trapped-ion quantum logic gate, the method comprising:
providing a trapped-ion quantum logic gate, the gate comprising:
at least one ion having two internal states and forming a qubit having a qubit transition frequency ω0;
a magnetic field gradient; and
two microwave fields, each having a respective frequency that is detuned from the qubit transition frequency ω0 by frequency difference δ, the at least one ion having a Rabi frequency Ωμ due to the two microwave fields and a Rabi frequency Ωg due to the magnetic field gradient; and
applying the magnetic field gradient and the two microwave fields to the at least one ion such that a quantity Ωg/δ is in a range between zero and 5×10−2.