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Bychek, A. A.
NOON state of Bose atoms in the double-well potential via an excited-state quantum phase transition / A. A. Bychek, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст. 063624, DOI 10.1103/PhysRevA.97.063624. - Cited References: 60. - The authors acknowledge financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Region Science and Technology Support Fund through Grant No. 16-42-240746. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
EINSTEIN CONDENSATE
   SUPERPOSITION STATES
   NOBEL LECTURE
   ENTANGLEMENT
Аннотация: We suggest a simple scheme for creating a NOON state of repulsively interacting Bose atoms in the double-well potential. The protocol consists of two steps. First, by setting atom-atom interactions to zero, the system is driven to the upper excited state. Second, the interactions are slowly increased and, simultaneously, the interwell tunneling is decreased to zero. We analyze fidelity of the final state to the NOON state depending on the number of atoms, ramp rate, and fluctuations of the system parameters. It is shown that for a given fidelity the ramp rate scales algebraically with the number of atoms.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund [16-42-240746]
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Бычек, Анна Андреевна.
Спектральные и динамические характеристики холодных Бозе атомов в оптическом потенциале нескольких ям / А. А. Бычек, А. Р. Коловский // XXII конф. мол. ученых ФИЦ КНЦ СО РАН : сборник тезисов. - Красноярск, 2019. - С. 13. - Библиогр.: 3

Материалы конференции
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Коловский, Андрей Радиевич; Kolovsky, A. R.; Bychek, A. A.; Конференция молодых ученых ФИЦ КНЦ СО РАН(22 ; 2019 ; апр. ; 18 ; Красноярск)
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    Bychek, A. A.
    Probing quantum chaos in many-body quantum systems by the induced dissipation / A. A. Bychek, P. S. Muraev, A. R. Kolovsky // Phys. Rev. A. - 2019. - Vol. 100, Is. 1. - Ст. 013610, DOI 10.1103/PhysRevA.100.013610. - Cited References: 29. - This work has been supported through Russian Science Foundation Grant N19-12-00167. The authors are grateful to D. N. Maksimov for stimulating discussions. . - ISSN 2469-9926. - ISSN 2469-9934
   Перевод заглавия: Исследование квантового хаоса в многочастичных квантовых системах при помощи диссипации

РУБ Optics + Physics, Atomic, Molecular & Chemical

Аннотация: We theoretically analyze the depletion dynamics of an ensemble of cold atoms in a quasi-one-dimensional optical lattice where atoms in one of the lattice sites are subject to decay. Unlike the previous studies of this problem in Labouvie et al., Phys. Rev. Lett. 116, 235302 (2016), we focus on the case where the system is brought to the chaotic regime, which crucially modifies the depletion dynamics as compared to the regular case. It is shown that depletion of the affected site results in gradual depletion of the neighboring sites according to the t1/3 scaling law. We also show that by measuring occupations of the lattice sites one can extract important information on chaotic dynamics of the original conservative system.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Muraev, Pavel S.; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Science Foundation [N19-12-00167]
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Open bose-hubbard chain: pseudoclassical approach / A. A. Bychek, P. S. Muraev, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. E. - 2020. - Vol. 101, Is. 1. - Ст. 012208, DOI 10.1103/PhysRevE.101.012208. - Cited References: 29. - This work has been supported through Russian Science Foundation (RU), N19-12-00167 . - ISSN 2470-0045. - ISSN 2470-0053

РУБ Physics, Fluids & Plasmas + Physics, Mathematical

Аннотация: We analyze the stationary current of bosonic carriers in the Bose-Hubbard chain of length L where the first and the last sites of the chain are attached to reservoirs of Bose particles acting as a particle source and sink, respectively. The analysis is carried out by using the pseudoclassical approach which reduces the original quantum problem to the classical problem for L coupled nonlinear oscillators. It is shown that an increase of oscillator nonlinearity (which is determined by the strength of interparticle interactions) results in a transition from the ballistic transport regime, where the stationary current is independent of the chain length, to the diffusive regime, where the current is inversely proportional to L.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Bychek, A. A.; Бычек, Анна Андреевна; Muraev, P. S.; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Russian Science FoundationRussian Science Foundation (RSF) [N19-12-00167]
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Chaotic and regular dynamics in the three-site Bose-Hubbard model / A. A. Bychek, P. S. Muraev, D. N. Maksimov [et al.] // AIP Conf. Proc. - 2020. - Vol. 2241. - Ст. 020007DOI 10.1063/5.0011540. - Cited References: 30. - This work has been supported through Russian Science Foundation Grant N19-12-00167
Аннотация: We analyze the energy spectrum of the three-site Bose-Hubbard model. It is shown that this spectrum is a mixture of the regular and irregular spectra associated with the regular and chaotic components of the classical Bose-Hubbard model. We find relative volumes of these components by using the pseudoclassical approach. Substituting these values in the Berry-Robnik distribution for the level spacing statistics we obtain good agreement with the numerical data.

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Держатели документа:
L.V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
M.F. Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Bychek, A. A.; Бычек, Анна Андреевна; Muraev, P. S.; Мураев, Павел Сергеевич; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; International Conference on Quantum Technologies(5th ; 15 - 19 July 2019 ; Moscow)
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Bychek, A. A.
Decay of symmetry-protected quantum states / A. A. Bychek, D. N. Maksimov, A. R. Kolovsky // Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст. 033324, DOI 10.1103/PhysRevA.102.033324. - Cited References: 47. - This work has been supported by Russian Science Foundation through Grant No. N19-12-00167. We appreciate discussions with A. F. Sadreev and E. N. Bulgakov. We are also grateful to G. P. Fedorov for his critical reading of the manuscript . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
DRIVEN
Аннотация: We study the decay of bosonic many-body states in the triple-well Bose-Hubbard model where bosons in the central well can escape into a reservoir. For vanishing interparticle interaction this system supports a nondecaying many-body state which is the antisymmetric Bose-Einstein condensate with particles occupying only the edge wells. In the classical approach this quantum state corresponds to a symmetry-protected nondecaying state which is stable even at finite interaction below a certain intensity threshold. Here we demonstrate that despite the fact that the classical counterpart is stable the antisymmetric Bose-Einstein condensate is always metastable at finite interatomic interactions due to quantum fluctuations.

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Держатели документа:
Fed Res Ctr KSC SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Kolovsky, A. R.; Коловский, Андрей Радиевич; Бычек, Анна Андреевна; Russian Science FoundationRussian Science Foundation (RSF) [N19-12-00167]
}
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