首页|Preparation of maximally-entangled states with multiple cat-state qutrits in circuit QED

Preparation of maximally-entangled states with multiple cat-state qutrits in circuit QED

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In recent years,cat-state encoding and high-dimensional entanglement have attracted much attention.However,previous works are limited to generation of entangled states of cat-state qubits(two-dimensional entan-glement with cat-state encoding),while how to prepare entangled states of cat-state qutrits or qudits(high-dimensional entanglement with cat-state encoding)has not been investigated.We here propose to generate a maxi-mally-entangled state of multiple cat-state qutrits(three-dimensional entanglement by cat-state encoding)in circuit QED.The entangled state is prepared with multiple microwave cavities coupled to a superconducting flux ququart(a four-level quantum system).This proposal operates essen-tially by the cavity-qutrit dispersive interaction.The circuit hardware resource is minimized because only a coupler ququart is employed.The higher intermediate level of the ququart is occupied only for a short time,thereby decoherence from this level is greatly suppressed during the state preparation.Remarkably,the state preparation time does not depend on the number of the qutrits,thus it does not increase with the number of the qutrits.As an example,our numerical simulations demonstrate that,with the present circuit QED technology,the high-fidelity preparation is feasible for a maximally-entangled state of two cat-state qutrits.Furthermore,we numerically analyze the effect of the inter-cavity crosstalk on the scalability of this proposal.This proposal is universal and can be extended to accom-plish the same task with multiple microwave or optical cavities coupled to a natural or artificial four-level atom.

maximally-entangled statescat statequtritcircuit QED

Chui-Ping Yang、Jia-Heng Ni、Liang Bin、Yu Zhang、Yang Yu、Qi-Ping Su

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Department of Physics,Hangzhou Normal University,Hangzhou 311121,China

School of Physics,Nanjing University,Nanjing 210093,China

Institute for Quantum Science and Technology,University of Calgary,Alberta T2N 1N4,Canada

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Key-Area Research and Development Program of Guangdong ProvinceJiangsu Funding Program for Excellent Postdoctoral TalentInnovation Program for Quantum Science and Technology

110740621137408311774076U21A204362018B0303260012021ZD0301705

2024

10.1007/s11467-023-1357-4

物理学前沿
高等教育出版社

物理学前沿

CSTPCD
影响因子：0.816
ISSN：2095-0462
年,卷(期)：2024.19(3)
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