Adiabatic speedup or quantum state transfer in a non-Markovian quantum open system

來源:發(fā)布時(shí)間:2020-09-07

【講座題目】Adiabatic speedup or quantum state transfer in a non-Markovian quantum open system

【講座時(shí)間】2020年9月10日(星期四) 14:30

【講座地點(diǎn)】騰訊會(huì)議 966 276 442

】王兆明  中國(guó)海洋大學(xué)教授

【主講人簡(jiǎn)介】

王兆明,北京理工大學(xué)與美國(guó)南伊利諾伊大學(xué)聯(lián)合培養(yǎng)博士(2009);中國(guó)海洋大學(xué)教授(2016),博導(dǎo)(2017),現(xiàn)任物理系副主任。美國(guó)斯蒂文斯理工學(xué)院 (2017-2018)、新加坡國(guó)立大學(xué)(2014)、西班牙巴斯克大學(xué)(2012,2016)訪問學(xué)者。 npj Quantum Information、PRL、PRA、SR、JPB、PLA、EPJD 等學(xué)術(shù)期刊審稿人。長(zhǎng)期從事固態(tài)量子信息的基礎(chǔ)理論研究,特別是基于自旋系統(tǒng)的量子通信、絕熱量子計(jì)算、以及開放系統(tǒng)的動(dòng)力學(xué)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(xiàn)了一類可以實(shí)現(xiàn)高質(zhì)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(shí)現(xiàn)了有效的絕熱過程的加速。在 Phys. Rev. Lett.等學(xué)術(shù)期刊發(fā)表 SCI 論文 50 余篇。研究成果獲山東省高等學(xué)校優(yōu)秀科研成果獎(jiǎng)。承擔(dān)國(guó)家自然科學(xué)基金,山東省自然科學(xué)基金等科研項(xiàng)目多項(xiàng)。

【內(nèi)容簡(jiǎn)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.

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