Physics – Quantum Physics
Scientific paper
2007-02-13
Phys. Rev. Lett. 99, 123001 (2007)
Physics
Quantum Physics
4 pages, 3 figures v4: minor changes in text, changes in the references, published version
Scientific paper
10.1103/PhysRevLett.99.123001
We propose a method for laser cooling group-II-like atoms without changing the quantum state of their nuclear spins, thus preserving coherences that are usually destroyed by optical pumping. As group-II-like atoms have a $^1S_0$ closed-shell ground state, nuclear spin and electronic degrees of freedom are decoupled, allowing for independent manipulation. The hyperfine interaction that couples these degrees of freedom in excited states can be suppressed through the application of external magnetic fields. Our protocol employs resolved-sideband cooling on the forbidden clock transition, $^1S_0 \to {}^3P_0$, with quenching via coupling to the rapidly decaying $^1P_1$ state, deep in the Paschen-Back regime. This makes it possible to laser cool neutral atomic qubits without destroying the quantum information stored in their nuclear spins, as shown in two examples, $^{171}$Yb and $^{87}$Sr.
Deutsch Ivan H.
Reichenbach Iris
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