- By:
- Clark, Craig; Tinkey, Holly; Sawyer, Brian; Meier, Adam; Burkhardt, Karl; Seck, Christopher M; Shappert, Christopher; Guise, Nicholas; Volin, Curtis; Fallek, Spencer; Hayden, Harley; Rellergert, Wade; Brown, Kenton
- Journal Name:
- Physical Review Letters
- Page Number:
- 130505-130505
- Volume:
- 127
- Issue Number:
- 13
- Publication Date:
- November 9, 2023
- View DOI Listing:
- https://doi.org/10.1103/PhysRevLett.127.130505
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 40Ca+ ions in a cryogenic surface-electrode ion trap and a commercial, high-power, 532 nm Nd:YAG laser. Generating a Bell state in 35  μs, we directly measure an infidelity of 6(3)×10−4 without subtraction of experimental errors. The 532 nm gate laser wavelength suppresses intrinsic photon scattering error to ∼1×10−5.
