【講座題目】Adiabatic speedup or quantum state transfer in a non-Markovian quantum open system
【講座時間】2020年9月10日(星期四) 14:30
【講座地點】騰訊會議 966 276 442
【主 講 人】王兆明 中國海洋大學教授
【主講人簡介】
王兆明,,北京理工大學與美國南伊利諾伊大學聯(lián)合培養(yǎng)博士(2009),;中國海洋大學教授(2016),,博導(2017),,現任物理系副主任,。美國斯蒂文斯理工學院 (2017-2018)、新加坡國立大學(2014),、西班牙巴斯克大學(2012,2016)訪問學者,。 npj Quantum Information、PRL,、PRA,、SR、JPB,、PLA,、EPJD 等學術期刊審稿人。長期從事固態(tài)量子信息的基礎理論研究,,特別是基于自旋系統(tǒng)的量子通信,、絕熱量子計算、以及開放系統(tǒng)的動力學演化等方向的研究,。首次研究了自旋系統(tǒng)中的雙向量子通信,,并發(fā)現了一類可以實現高質量通信的編碼態(tài),。與合作者首次提出了零能量改變的脈沖控制,并用來實現了有效的絕熱過程的加速,。在 Phys. Rev. Lett.等學術期刊發(fā)表 SCI 論文 50 余篇,。研究成果獲山東省高等學校優(yōu)秀科研成果獎。承擔國家自然科學基金,,山東省自然科學基金等科研項目多項,。
【內容簡介】
Adiabatic quantum computation requires keeping a system in a particular eigenstate. However, unwanted transitions can occur due to the interaction of the system with a noisy environment. The adiabatic evolution of the system will then be ruined. Here we present an effective control scheme to allow for a speedup of the adiabatic process by using a sequence of pulses on the system. By carefully choosing the pulse intensity and duration, an accelerated adiabatic path can be obtained for both a weak-coupling and a strong non-Markovian environment. In the second part, we report the feasibility of using an effective pulse control methods to realize an almost exact state transmission through a uniform chain where the communication channel is immersed in a quantum environment. The results show that the memory effects of the environment can support an effective transmission control that can be boosted under a non-Markovian environment.