Several techniques of generating random quantum channels, which act on the set of d-dimensional quantum states, are investigated. We present three approaches to the problem of sampling of quantum channels and show that they are mathematically equivalent. We discuss under which conditions they give the uniform Lebesgue measure on the convex set of quantum operations and compare their advantages and computational complexity and demonstrate which of them is particularly suitable for numerical investigations. Additional results focus on the spectral gap and other spectral properties of random quantum channels and their invariant states. We compute the mean values of several quantities characterizing a given quantum channel, including its unitarity, the average output purity, and the 2-norm coherence of a channel, averaged over the entire set of the quantum channels with respect to the uniform measure. An ensemble of classical stochastic matrices obtained due to super-decoherence of random quantum stochastic maps is analyzed, and their spectral properties are studied using the Bloch representation of a classical probability vector.
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June 2021
Research Article|
June 01 2021
Generating random quantum channels Available to Purchase
Ryszard Kukulski
;
Ryszard Kukulski
a)
1
Institute of Theoretical and Applied Informatics, Polish Academy of Sciences
, Bałtycka 5, 44-100 Gliwice, Poland
a)Author to whom correspondence should be addressed: [email protected]
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Ion Nechita
;
Ion Nechita
2
CNRS, Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, UPS
, F-31062 Toulouse, France
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Łukasz Pawela
;
Łukasz Pawela
1
Institute of Theoretical and Applied Informatics, Polish Academy of Sciences
, Bałtycka 5, 44-100 Gliwice, Poland
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Zbigniew Puchała
;
Zbigniew Puchała
1
Institute of Theoretical and Applied Informatics, Polish Academy of Sciences
, Bałtycka 5, 44-100 Gliwice, Poland
3
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University
, ul. Łojasiewicza 11, 30-348 Kraków, Poland
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Karol Życzkowski
Karol Życzkowski
3
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University
, ul. Łojasiewicza 11, 30-348 Kraków, Poland
4
Center for Theoretical Physics, Polish Academy of Sciences
, al. Lotników 32/46, 02-668 Warszawa, Poland
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Ryszard Kukulski
1,a)
Ion Nechita
2
Łukasz Pawela
1
Zbigniew Puchała
1,3
Karol Życzkowski
3,4
1
Institute of Theoretical and Applied Informatics, Polish Academy of Sciences
, Bałtycka 5, 44-100 Gliwice, Poland
2
CNRS, Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, UPS
, F-31062 Toulouse, France
3
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University
, ul. Łojasiewicza 11, 30-348 Kraków, Poland
4
Center for Theoretical Physics, Polish Academy of Sciences
, al. Lotników 32/46, 02-668 Warszawa, Poland
a)Author to whom correspondence should be addressed: [email protected]
J. Math. Phys. 62, 062201 (2021)
Article history
Received:
November 26 2020
Accepted:
May 04 2021
Citation
Ryszard Kukulski, Ion Nechita, Łukasz Pawela, Zbigniew Puchała, Karol Życzkowski; Generating random quantum channels. J. Math. Phys. 1 June 2021; 62 (6): 062201. https://doi.org/10.1063/5.0038838
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