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arXiv quant-ph/0703254quant-phhep-thmath-phmath.MP
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非厄米哈密顿量的量子最速线问题

The quantum brachistochrone problem for non-Hermitian Hamiltonians

Paulo E. G. Assis, Andreas Fring

摘要:

最近,Bender,Brody,Jones和Meister发现,在量子最速线问题中,当时间演化算子是非厄米但PT对称时,某些初始状态演化到指定的最终状态所需的通过时间可以任意小。在这里,我们证明,这种现象也可以得到非厄米哈密顿的PT对称性是完全破缺,即耗散系统。我们观察到,一个可调的通过时间的效果,可以通过投影正交本征态之间的时间演化算子相关联的非厄米哈密顿。这个哈密尔顿算子不是PT对称的。

英文摘要:

Recently Bender, Brody, Jones and Meister found that in the quantum brachistochrone problem the passage time needed for the evolution of certain initial states into specified final states can be made arbitrarily small, when the time-evolution operator is taken to be non-Hermitian but PT-symmetric. Here we demonstrate that such phenomena can also be obtained for non-Hermitian Hamiltonians for which PT-symmetry is completely broken, i.e. dissipative systems. We observe that the effect of a tunable passage time can be achieved by projecting between orthogonal eigenstates by means of a time-evolution operator associated to a non-Hermitian Hamiltonian. It is not essential that this Hamiltonian is PT-symmetric.

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