Abstract
Entanglement generation in trapped-ion systems has relied thus far on two distinct but related geometric phase gate techniques: Mølmer-Sørensen and light-shift gates. We recently proposed a variant of the light-shift scheme where the qubit levels are separated by an optical frequency [B. C. Sawyer and K. R. Brown, Phys. Rev. A 103, 022427 (2021)]. Here we report an experimental demonstration of this entangling gate using a pair of ions in a cryogenic surface-electrode ion trap and a commercial, high-power, 532 nm Nd:YAG laser. Generating a Bell state in , we directly measure an infidelity of without subtraction of experimental errors. The 532 nm gate laser wavelength suppresses intrinsic photon scattering error to .
- Received 30 June 2021
- Accepted 19 August 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.130505
© 2021 American Physical Society