Fast quantum state transfer and entanglement preparation in strongly coupled bosonic systems

Continuous U(1) gauge symmetry, which guarantees the conservation of total excitations in linear bosonic systems, will be broken when it comes to the strong-coupling regime where the rotation wave approximation (RWA) fails. Here we develop analytic solutions for multi-mode bosonic systems with XX-ty...

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Bibliographic Details
Published in:New journal of physics 2023-11, Vol.25 (11), p.113015
Main Authors: Xu, Yilun, Zhu, Daoquan, Sun, Feng-Xiao, He, Qiongyi, Zhang, Wei
Format: Article
Language:English
Subjects:
Approximation
continuous symmetry
Couplings
entanglement preparation
Exact solutions
Excitation
Information science
Mathematical analysis
Optics
Physics
Pulse duration
quantum state transfer
strong coupling
Symmetry
Thermal noise
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Summary:Continuous U(1) gauge symmetry, which guarantees the conservation of total excitations in linear bosonic systems, will be broken when it comes to the strong-coupling regime where the rotation wave approximation (RWA) fails. Here we develop analytic solutions for multi-mode bosonic systems with XX-type couplings beyond RWA, and propose a novel scheme to implement high-fidelity quantum state transfer (QST) and entanglement preparation (EP) with high speed. The scheme can be realized with designated coupling strength and pulse duration with which the excitation number keeps unchanged regardless of the breakdown of the global U(1) symmetry. In QST tasks, we consider several typical quantum states and demonstrate that this method is robust against thermal noise and imperfections of experimental sequence. In EP tasks, the scheme is successfully implemented for the preparation of Bell states and W-type states, within a shortest preparation time.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ad08f2