Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half.
Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half.
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DOI：
10.1103/physrevlett.102.033601
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发表时间：
2008-08
影响因子：
8.6
通讯作者：
T. Takano;M. Fuyama;R. Namiki;Y. Takahashi
中科院分区：
文献类型：
--
作者：
T. Takano;M. Fuyama;R. Namiki;Y. Takahashi
为了建立一个基于光与原子相互作用的先进量子信息处理的实用系统，我们用冷Yb原子(171Yb)的集体自旋进行了量子非破坏测量，并观察到了1.8(-1.5)+2.4分贝的自旋压缩。由于171Yb原子在基态只有一半的核自旋，因此该系统构成了最简单的自旋系综，因此对退相干具有很强的抵抗力。我们使用了宽度为100 ns的非常短的脉冲，因此相互作用时间变得比退相干时间短得多，这对于多步量子信息处理是重要的。
In order to establish an applicable system for advanced quantum information processing based on the interaction between light and atoms, we have demonstrated a quantum nondemolition measurement with a collective spin of cold ytterbium atoms (171Yb), and have observed 1.8(-1.5)+2.4 dB spin squeezing. Since 171Yb atoms have only a nuclear spin of one-half in the ground state, the system constitutes the simplest spin ensemble and is thus robust against decoherence. We used very short pulses with a width of 100 ns, and as a result the interaction time became much shorter than the decoherence time, which is important for multistep quantum information processing.