Non-Holonomic Control IV : Coherence Protection in a Rubidium isotope

Coherence protection by the quantum Zeno effect and non-holonomic control in a Rydberg Rubidium isotope

The protection of the coherence of open quantum systems against the influence of their environment is a very topical issue. A scheme is proposed here which protects a general quantum system from the action of a set of arbitrary uncontrolled unitary evolutions. This method draws its inspiration from ideas of standard error-correction (ancilla adding, coding and decoding) and the Quantum Zeno Effect. A pedagogical demonstration of our method on a simple atomic system, namely a Rubidium isotope, is proposed.

跨越铷同位素和跃迁的光学存储优化

Optical Memory Optimization Across Rubidium Isotopes and Transitions

本文研究了在85Rb和87Rb同位素的D1和D2跃迁上的光学存储效率和存储时间，通过优化近共振EIT方案实现了高达44%的效率和1.5毫秒的存储时间，为简化实验配置下的暖铷蒸气光学存储性能优化提供了实用指南。

Preparation and probing of the ground state coherence in Rubidium

We demonstrate the preparation and probing of the coherence between the hyperfine ground states |5S_{1/2}, F=1> and |5S_{1/2}, F=2> of the Rubidium 87 isotope. The effect of various coherence control techniques, i.e. fractional Stimulated Raman Adiabatic Passage and Coherent Population Return on the coherence are investigated. These techniques are implemented using nearly degenerate pump and Stokes lasers at 795nm (Rubidium D1 transition) which couple the two hyperfine ground states via the excited state |5P_{1/2}, F=1> through a resonant two-photon process, in which a coherent superposition o…