International Collaboration in Chemistry: Decoherence control via quantum dynamical decoupling - theory and experiment

化学国际合作：通过量子动力学解耦控制退相干 - 理论与实验

• 批准号: 147191111
• 负责人: Professor Dr. Dieter Suter
• 金额: --
• 依托单位: Department of Chemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/147191111?language=en
• 关键词: International; Collaboration; Chemistry; Decoherence; control

Quantum information promises to revolutionize various fields of science and technology. Its implementation is hampered mostly by decoherence, the loss of information due to unwanted and uncontrolled couplings of the quantum system with its environment. This project aims at reducing this effect by applying pulse sequences designed to refocus or decouple the interaction between the quantum system and its environment. This idea is closely related to the spin-echo effect, but here the investigators shall consider a much more general and robust approach, aimed at arbitrarily long coherence preservation. While preservation of quantum coherence is essential for “quantum memory” applications, where one wishes to store a quantum state, quantum computers require an additional advance: it should be possible to process quantum information reliably. This is the second area where the investigators plan to make a contribution, again by using dynamical decoupling in an NMR setting. To accomplish this goal, we will combine techniques such as quantum error correcting codes and decoherence-free subspaces with dynamical decoupling. This will enable us to combine information processing with its protection against decoherence.

量子信息有望给各个科学技术领域带来革命性的变化。它的实现主要受到退相干的阻碍，退相干是由于量子系统与其环境的不需要和不受控制的耦合而导致的信息损失。该项目旨在通过应用脉冲序列来减少这种影响，这些脉冲序列旨在重新聚焦或解耦量子系统与其环境之间的相互作用。这个想法与自旋回波效应密切相关，但在这里，研究人员应该考虑一种更一般和更强大的方法，旨在任意长时间的相干保存。虽然保持量子相干性对于“量子记忆”应用至关重要，因为人们希望存储量子态，但量子计算机还需要一个额外的进步：它应该能够可靠地处理量子信息。这是研究人员计划做出贡献的第二个领域，也是通过在NMR设置中使用动态解耦。为了实现这一目标，我们将结合量子纠错码和无退相干子空间等技术与动态解耦。这将使我们能够将信息处理与防止退相干的保护结合起来。