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报告题目The power of non-Hermitian quantum sensing8E5B



报告地点线上报告(腾讯会议ID:334 175 351 )


Hermiticity of a Hamiltonian is one of the key postulates in quantum mechanics. It leads to two key consequences: (i) The energy eigenvalues must be real, which ensures the conservation of the  probability. (ii) The eigenstates form an ortho-normal complete basis, so that the response of the eigen-energy and the eigenstates to external perturbations are bounded. In recent years, there has  been widespread interest in open quantum systems described by a non-Hermitian Hamiltonian, which breaks both (i) and (ii). In particular, at the exceptional points where multiple eigenvalues and eigenstates coalesce, the energy eigenvalues show divergent response to external perturbations. This causes recent debates about whether unlimited sensitivity is possible by operating the  non-Hermitian quantum sensors near the exceptional point. In this talk, I will try to convey my understanding about  these issues, including how to calculate the non-Hermitian evolution, how to simulate a non-Hermitian Hamiltonian through the use of ancilla qubits, and why the eigenvalues and eigenstates of non-Hermitian Hamiltonian are much more sensitive to small perturbations than their Hermitian counterparts.




天津大学理学院 量子交叉研究中心   地址:天津津南区 雅观路135号 天津大学北洋园校区32楼146 
Center for Joint Quantum Studies, School of Science, Tianjin University     Address : Yaguan Road 135, Jinnan District, 300350 Tianjin, P. R. China