Qubit ZooDemonstrated extended coherence times (~1 s Ramsey) on the ⁸⁷Rb hyperfine clock transition in an optical dipole trap using a magic-wavelength configuration.
Key Results
- Ramsey coherence time T₂* ≈ 1 s on the ⁸⁷Rb |F=1, mF=0⟩ ↔ |F=2, mF=0⟩ clock transition
- Magic-wavelength trapping to suppress differential light shifts
- Optically trapped ensemble (not single atoms), but coherence applies to single-atom qubits using the same encoding
- Demonstrated that hyperfine ground-state encoding provides intrinsically long coherence
Significance
This result established the benchmark coherence time for ⁸⁷Rb hyperfine qubits in optical traps, confirming that neutral atom qubits can achieve second-scale T₂ — far exceeding superconducting qubit coherence. The clock transition encoding is now standard for neutral atom quantum computing platforms.
Links
- Journal: Physical Review Letters