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- W4367000407 abstract "There has been debate around applicability of exceptional points (EP) for quantum sensing. To resolve this, we first explore how to experimentally implement the nonhermitian non-diagonalizable Hamiltonians, that exhibit EPs, on quantum computers which run on unitary gates. We propose to use an ancilla-based method in this regard. Next, we show how such Hamiltonians can be used for parameter estimation using quantum computers and analyze its performance in terms of Quantum Fisher Information ($QFI$) at EPs, without noise and in presence of noise. It is well known that $QFI$ of a parameter to be estimated is inversely related to the variance of the parameter by the quantum Cramer-Rao bound. Therefore the divergence of $QFI$ at EPs promise sensing advantages. We experimentally demonstrate and theoretically show that $QFI$ indeed diverges in such EP systems which were earlier considered to be non-divergent." @default.
- W4367000407 created "2023-04-27" @default.
- W4367000407 creator A5047841360 @default.
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- W4367000407 date "2023-04-21" @default.
- W4367000407 modified "2023-09-24" @default.
- W4367000407 title "Simulation of exceptional-point systems on quantum computers for quantum sensing" @default.
- W4367000407 doi "https://doi.org/10.48550/arxiv.2304.12181" @default.
- W4367000407 hasPublicationYear "2023" @default.
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