Preparation of entangled W states based on the cavity QED system

doi:10.1088/1674-1056/ad50bf

中国物理B ›› 2024, Vol. 33 ›› Issue (9): 90306-090306.doi: 10.1088/1674-1056/ad50bf

Preparation of entangled W states based on the cavity QED system

Ke Li(李可)^1,† and Jun-Long Zhao(赵军龙)²

1 Department of Physics, Shanghai Second Polytechnic University, Shanghai 201209, China;
2 Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China

收稿日期:2024-03-04 修回日期:2024-05-22 接受日期:2024-05-28 发布日期:2024-08-15
通讯作者: Ke Li E-mail:like@sspu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12204311) and the Jiangxi Natural Science Foundation (Grant No. 20224BAB211025).

Preparation of entangled W states based on the cavity QED system

Ke Li(李可)^1,† and Jun-Long Zhao(赵军龙)²

1 Department of Physics, Shanghai Second Polytechnic University, Shanghai 201209, China;
2 Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China

Received:2024-03-04 Revised:2024-05-22 Accepted:2024-05-28 Published:2024-08-15
Contact: Ke Li E-mail:like@sspu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12204311) and the Jiangxi Natural Science Foundation (Grant No. 20224BAB211025).

摘要/Abstract

摘要： We present a qubit-loss-free (QLF) fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics (QED) system. Compared to the most current fusion schemes which are conditioned on the case where one particle can be extracted from each initial W state to the fusion process, our scheme will access one or two particles from each W state. Based on the atom-cavity-field detuned interaction, three $|W\rangle_{n+m+t}$ states can be generated from the $|W\rangle_n$, $|W\rangle_m$, and $|W\rangle_t$ states with the help of two auxiliary atoms, and three $|W\rangle_{n+m+t+q}$ states can be generated from $|W\rangle_n$, $|W\rangle_m$, $|W\rangle_t$, and a $|W\rangle_q$ state with the help of three auxiliary atoms. Comparing the numerical simulations of the resource cost of fusing three small-size W states based on the previous schemes, our fusion scheme seems to be more efficient. This QLF fusion scheme can be generalized to the case of fusing $k$ different or identical particle W states. Furthermore, with no qubit loss, it greatly reduces the number of fusion steps and prepares W states with larger particle numbers.

关键词: W state, detuned interaction, state fusion, cavity quantum electrodynamics

Abstract: We present a qubit-loss-free (QLF) fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics (QED) system. Compared to the most current fusion schemes which are conditioned on the case where one particle can be extracted from each initial W state to the fusion process, our scheme will access one or two particles from each W state. Based on the atom-cavity-field detuned interaction, three $|W\rangle_{n+m+t}$ states can be generated from the $|W\rangle_n$, $|W\rangle_m$, and $|W\rangle_t$ states with the help of two auxiliary atoms, and three $|W\rangle_{n+m+t+q}$ states can be generated from $|W\rangle_n$, $|W\rangle_m$, $|W\rangle_t$, and a $|W\rangle_q$ state with the help of three auxiliary atoms. Comparing the numerical simulations of the resource cost of fusing three small-size W states based on the previous schemes, our fusion scheme seems to be more efficient. This QLF fusion scheme can be generalized to the case of fusing $k$ different or identical particle W states. Furthermore, with no qubit loss, it greatly reduces the number of fusion steps and prepares W states with larger particle numbers.

Key words: W state, detuned interaction, state fusion, cavity quantum electrodynamics

中图分类号: (Quantum algorithms, protocols, and simulations)

03.67.Ac

03.67.Hk (Quantum communication) 03.65.Ud (Entanglement and quantum nonlocality) 03.67.Bg (Entanglement production and manipulation)

Ke Li(李可) and Jun-Long Zhao(赵军龙). Preparation of entangled W states based on the cavity QED system[J]. 中国物理B, 2024, 33(9): 90306-090306.

Ke Li(李可) and Jun-Long Zhao(赵军龙). Preparation of entangled W states based on the cavity QED system[J]. Chin. Phys. B, 2024, 33(9): 90306-090306.

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Preparation of entangled W states based on the cavity QED system

Preparation of entangled W states based on the cavity QED system

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