Localization in Open Quantum Systems

Yusipov, Igor; Laptyeva, T. V.; Денисов, С. В.; Ivanchenko, Mikhail

doi:10.1103/physrevlett.118.070402

Cited by 36 publications

(38 citation statements)

References 51 publications

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“…This is owing to the fact that both decays can carry away information about the system and destroy its coherence. For this reason, many approaches, which have been proposed for entanglement preparation, are focused on dissipation engineering, which treats dissipative processes as a resource rather than as a detrimental noise [16][17][18][19][20][21][22][23]. In the resulting entanglement, the infidelity scaling has a quadratic improvement, δ ∝ 1/C [24][25][26][27][28][29][30].…”

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confidence: 99%

Exponentially Enhanced Light-Matter Interaction, Cooperativities, and Steady-State Entanglement Using Parametric Amplification

et al. 2018

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We propose an experimentally feasible method for enhancing the atom-field coupling as well as the ratio between this coupling and dissipation (i.e., cooperativity) in an optical cavity. It exploits optical parametric amplification to exponentially enhance the atom-cavity interaction and, hence, the cooperativity of the system, with the squeezing-induced noise being completely eliminated. Consequently, the atom-cavity system can be driven from the weak-coupling regime to the strong-coupling regime for modest squeezing parameters, and even can achieve an effective cooperativity much larger than 100. Based on this, we further demonstrate the generation of steady-state nearly maximal quantum entanglement. The resulting entanglement infidelity (which quantifies the deviation of the actual state from a maximally entangled state) is exponentially smaller than the lower bound on the infidelities obtained in other dissipative entanglement preparations without applying squeezing. In principle, we can make an arbitrarily small infidelity. Our generic method for enhancing atom-cavity interaction and cooperativities can be implemented in a wide range of physical systems, and it can provide diverse applications for quantum information processing.

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confidence: 99%

Exponentially Enhanced Light-Matter Interaction, Cooperativities, and Steady-State Entanglement Using Parametric Amplification

et al. 2018

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“…Thus, our speed limit is again valuable for macroscopic transitions for which the coherent dynamics and incoherent dissipation process coexist. One of the examples of such processes can be the transport process in an extended quantum system with the stochastic hopping [124][125][126][127], which is proposed to be realized in a cold atomic system with engineered dissipation [127,128].…”

Section: Speed Limit For Macroscopic Quantum Systems With Markovian D...mentioning

confidence: 99%

Speed Limits for Macroscopic Transitions

Hamazaki

2021

Preprint

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“…[35], whereas Ref. [36] presents a general discussion of the effect of dissipation on Anderson localization. Very recently, the effect of Dzyaloshinskii-Moriya interactions on magnon localization was studied [37].…”

Section: B Disordered Systemmentioning

confidence: 99%

Green's function formalism for spin transport in metal-insulator-metal heterostructures

et al. 2017

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. (2017). Green's function formalism for spin transport in metal-insulator-metal heterostructures. Physical Review B, 96(17), [174422]. DOI: 10.1103/PhysRevB.96.174422 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We develop a Green's function formalism for spin transport through heterostructures that contain metallic leads and insulating ferromagnets. While this formalism in principle allows for the inclusion of various magnonic interactions, we focus on Gilbert damping. As an application, we consider ballistic spin transport by exchange magnons in a metal-insulator-metal heterostructure with and without disorder. For the former case, we show that the interplay between disorder and Gilbert damping leads to spin current fluctuations. For the case without disorder, we obtain the dependence of the transmitted spin current on the thickness of the ferromagnet. Moreover, we show that the results of the Green's function formalism agree in the clean and continuum limit with those obtained from the linearized stochastic Landau-Lifshitz-Gilbert equation. The developed Green's function formalism is a natural starting point for numerical studies of magnon transport in heterostructures that contain normal metals and magnetic insulators.

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Localization in Open Quantum Systems

Cited by 36 publications

References 51 publications

Exponentially Enhanced Light-Matter Interaction, Cooperativities, and Steady-State Entanglement Using Parametric Amplification

Exponentially Enhanced Light-Matter Interaction, Cooperativities, and Steady-State Entanglement Using Parametric Amplification

Speed Limits for Macroscopic Transitions

Green's function formalism for spin transport in metal-insulator-metal heterostructures

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