Rydberg mediated entanglement in a two-dimensional neutral atom qubit array*

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 FBell = 0.86(2). Accounting for errors in state preparation and measurement (SPAM) and single qubit operations
we infer that a Bell state created with the Rydberg mediated CZ gate has a fidelity of 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.