Protecting unknown qubit states from decoherence of qubit channels by weak measurement

Autor:	Ozra Heibati, Azam Mani, Esfandyar Faizi, Vahid Karimipour
Rok vydání:	2022
Předmět:	Statistics and Probability Modeling and Simulation General Physics and Astronomy Statistical and Nonlinear Physics Mathematical Physics
Zdroj:	Journal of Physics A: Mathematical and Theoretical. 55:235301
ISSN:	1751-8121 1751-8113
Popis:	The problem of combating de-coherence by weak measurements has already been studied for the amplitude damping channel and for specific input states. We generalize this to a large four-parameter family of qubit channels and for the average fidelity over all pure states. As a by-product we classify all the qubit channels which have one invariant pure state and show that the parameter manifold of these channels is isomorphic to S 2 × S 1 × S 1 and contains many interesting sub-classes of channels. By tuning the parameter of the weak measurement, we show that it is possible to increase the average input–output fidelity without blocking too many particles to pass through the channel. Quantitative analysis reveals that the increase of average fidelity can be up to 0.3, by blocking less than half of the particles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a4557b45b5c650dbe1137b6513645db8 https://doi.org/10.1088/1751-8121/ac6c62 Zobrazit plný text záznamu