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- W2810313636 abstract "We present a general approach to measurement-based quantum feedback that employs proportional and quantum state-based (PaQS) feedback components to obtain locally optimal protocols. To demonstrate the power of the method, we first show that it reproduces many known feedback protocols, and then apply it to generation of multipartite entanglement with an emphasis on remote entanglement, which requires spatially local feedback Hamiltonians. The symmetry of both measurement and feedback operators is found to be essential for construction of effective protocols. We show that under perfect measurement efficiency, entangled states can be reached with fidelity approaching unity under non-Markovian feedback control protocols, while Markovian protocols resulting from optimizing the feedback unitaries on ensemble averaged states still yield fidelities above 94%. Application of the PaQS approach to generation of N-qubit W, general Dicke and GHZ states shows that such entangled states can be efficiently generated with high fidelity, for up to N = 100 in some cases." @default.
- W2810313636 created "2018-07-10" @default.
- W2810313636 creator A5000888112 @default.
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- W2810313636 date "2020-12-21" @default.
- W2810313636 modified "2023-10-13" @default.
- W2810313636 title "Locally optimal measurement-based quantum feedback with application to multiqubit entanglement generation" @default.
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- W2810313636 doi "https://doi.org/10.1103/physreva.102.062418" @default.
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