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pro vyhledávání: '"Chapeau-Blondeau, François"'
Autor:
Chapeau-Blondeau, Francois
Publikováno v:
Fluctuation and Noise Letters, vol. 22, 2350036, pp. 1-9 (2023)
This letter further explores the recent scheme of switched quantum channels with indefinite causal order applied to the reference metrological task of quantum phase estimation in the presence of noise. We especially extend the explorations, previousl
Externí odkaz:
http://arxiv.org/abs/2312.02832
Autor:
Chapeau-Blondeau, Francois
Publikováno v:
Fluctuation and Noise Letters, vol. 21, 2250060, pp. 1-17 (2022)
Quantum noise or decoherence is a major factor impacting the performance of quantum technologies. On the qubit, an important quantum noise, often relevant in practice, is the thermal noise or generalized amplitude damping noise, describing the intera
Externí odkaz:
http://arxiv.org/abs/2212.03582
Autor:
Chapeau-Blondeau, Francois
Publikováno v:
Physics Letters A, vol. 447, 128300, pp. 1-10 (2022)
A switched quantum channel with indefinite causal order is studied for the fundamental metrological task of phase estimation on a qubit unitary operator affected by quantum thermal noise. Specific capabilities are reported in the switched channel wit
Externí odkaz:
http://arxiv.org/abs/2211.01684
Autor:
Chapeau-Blondeau, Francois
Publikováno v:
Physical Review A, vol. 104, 032214, pp. 1-16 (2021)
A generic qubit unitary operator affected by quantum noise is duplicated and inserted in a coherently superposed channel, superposing two paths offered to a probe qubit across the noisy unitary, and driven by a control qubit. A characterization is pe
Externí odkaz:
http://arxiv.org/abs/2110.06715
Autor:
Chapeau-Blondeau, Francois
Publikováno v:
Physical Review A 103, 032615,1-18 (2021)
A generic qubit unitary operator affected by depolarizing noise is duplicated and inserted in a quantum switch process realizing a superposition of causal orders. The characterization of the resulting switched quantum channel is worked out for its ac
Externí odkaz:
http://arxiv.org/abs/2104.06284
Publikováno v:
In Chaos, Solitons and Fractals: the interdisciplinary journal of Nonlinear Science, and Nonequilibrium and Complex Phenomena January 2024 178
Akademický článek
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Autor:
Chapeau-Blondeau, Francois
Publikováno v:
International Journal of Quantum Information, Vol. 16, No. 07 (2018) 1850056 (25 pages)
For parameter estimation from an $N$-component composite quantum system, it is known that a separable preparation leads to a mean-squared estimation error scaling as $1/N$ while an entangled preparation can in some conditions afford a smaller error w
Externí odkaz:
http://arxiv.org/abs/1904.01904
Akademický článek
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Publikováno v:
In Digital Signal Processing November 2021 118