Fidelity

Quantum mechanics

Quantum computer

Rydberg formula

Quantum channel

Atomic physics

Telecommunications

Computer science

Physics

Quantum entanglement

Ionization

Quantum

Quantum teleportation

Qubit

Bell state

Physical Review Letters

We demonstrate high fidelity two-qubit Rydberg blockade and entanglement on a pair of sites in a large 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_{Bell}=0.86(2). Accounting for errors in state preparation and measurement we infer a fidelity of F_{Bell}^{-SPAM}=0.88. Accounting for errors in single qubit operations we infer that a Bell state created with the Rydberg mediated C_{Z} gate has a fidelity of F_{Bell}^{C_{Z}}=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.

Rydberg-Mediated Entanglement in a Two-Dimensional Neutral Atom Qubit Array