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|a (TOE)ost1873351
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|a (TOE)1873351
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|a E 1.99:LA-UR-21-20536
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|a E 1.99:LA-UR-21-20536
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|a LA-UR-21-20536
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|a Sub-quantum Fisher information
|h [electronic resource]
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|a Washington, D.C. :
|b United States. National Nuclear Security Administration ;
|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2021.
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| 300 |
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|a Size: Article No. 035008 :
|b digital, PDF file.
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|a text
|b txt
|2 rdacontent.
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|a computer
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|2 rdamedia.
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|a online resource
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|a Published through Scitech Connect.
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|a 06/15/2021.
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|a "LA-UR-21-20536."
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|a "Journal ID: ISSN 2058-9565."
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|a Cerezo de la Roca, Marco Vinicio Sebastian ; Sone, Akira ; Beckey, Jacob L. ; Coles, Patrick Joseph ;
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|a Aliro Technologies, Inc.
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|a We report the quantum Fisher information (QFI) plays a crucial role in quantum information theory and in many practical applications such as quantum metrology. However, computing the QFI is generally a computationally demanding task. In this work we analyze a lower bound on the QFI which we call the sub-quantum Fisher information (sub-QFI). The bound can be efficiently estimated on a quantum computer for an n-qubit state using 2n qubits. The sub-QFI is based on the super-fidelity, an upper bound on Uhlmann's fidelity. We analyze the sub-QFI in the context of unitary families, where we derive several crucial properties including its geometrical interpretation. In particular, we prove that the QFI and the sub-QFI are maximized for the same optimal state, which implies that the sub-QFI is faithful to the QFI in the sense that both quantities share the same global extrema. Based on this faithfulness, the sub-QFI acts as an efficiently computable surrogate for the QFI for quantum sensing and quantum metrology applications. Finally, we provide additional meaning to the sub-QFI as a measure of coherence, asymmetry, and purity loss.
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|b 89233218CNA000001.
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|b 1650115.
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|a 71 classical and quantum mechanics, general physics
|2 local.
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|a Quantum, metrology, fisher, information
|2 local.
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|a Sensing
|2 local.
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|a Algorithm
|2 local.
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|a Classical and quantum mechanics, general physics
|2 local.
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|a Los Alamos National Laboratory.
|4 res.
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|a United States.
|b National Nuclear Security Administration.
|4 spn.
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|a National Science Foundation (U.S.).
|4 spn.
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1 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information
|4 dst.
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| 856 |
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|u https://www.osti.gov/servlets/purl/1873351
|z Full Text (via OSTI)
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| 907 |
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|a .b12738733x
|b 02-28-23
|c 07-29-22
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| 998 |
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|a web
|b 12-08-22
|c f
|d m
|e p
|f eng
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|a Information bridge
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|s 450c613a-80b4-5ac0-bcf4-16c31c10479f
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| 952 |
f |
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:LA-UR-21-20536
|h Superintendent of Documents classification
|i web
|n 1
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