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arXiv quant-ph/0702120quant-ph
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类Ⅱ族原子核自旋态边带冷却与相干性保持

Sideband cooling while preserving coherences in the nuclear spin state in group-II-like atoms

Iris Reichenbach, Ivan H. Deutsch

摘要:

我们提出了一种激光冷却类Ⅱ族原子的方法,在不改变原子核自旋的量子态的情况下,保持了通常被光抽运破坏的相干性。由于类II族原子具有$^1S_0$闭壳基态,核自旋和电子自由度解耦,允许独立操纵。在激发态耦合这些自由度的超精细相互作用可以通过施加外部磁场来抑制。我们的协议采用解析边带冷却禁止的时钟跃迁,$^1S_0 \to {}^3P_0$,淬火通过耦合到快速衰减的$^1P_1$状态,深Paschen-Back制度。这使得激光冷却中性原子量子比特而不破坏存储在其核自旋中的量子信息成为可能,如两个例子所示,$^{171}$ Yb和$^{87}$ Sr。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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