2019/08/31 by T. M. Graham, M. Kwon, B. Grinkemeyer +6 · 2 citations
Physics and Astronomy · #quant-ph #physics.atom-ph
paper · pdf · doi:10.1103/physrevlett.123.230501
published as Phys. Rev. Lett. 123, 230501 (2019) · includes supplemental material, error analysis revised to use process matrices
arxiv created 2019/10/20 · arxiv updated 2019/12/11
We demonstrate high fidelity two-qubit Rydberg blockade and entanglement in a two-dimensional qubit array. The qubit array is defined by a grid of blue detuned lines of light with 121 sites for trapping atomic qubits. Improved experimental methods have increased the observed Bell state fidelity to F\rm Bell=0.86(2). Accounting for errors in state preparation and measurement (SPAM) we infer a fidelity of F\rm Bell\rm -SPAM=0.88. Accounting for errors in single qubit operations we infer that a Bell state created with the Rydberg mediated CZ gate has a fidelity of F\rm BellCZ=0.89. Comparison with a detailed error model based on quantum process matrices indicates that finite atom temperature and laser noise are the dominant error sources contributing to the observed gate infidelity.