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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 |
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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.
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Received: 04 March 2024
Revised: 22 May 2024
Accepted manuscript online: 28 May 2024
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PACS:
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03.67.Ac
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(Quantum algorithms, protocols, and simulations)
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03.67.Hk
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(Quantum communication)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Bg
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(Entanglement production and manipulation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12204311) and the Jiangxi Natural Science Foundation (Grant No. 20224BAB211025). |
Corresponding Authors:
Ke Li
E-mail: like@sspu.edu.cn
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Cite this article:
Ke Li(李可) and Jun-Long Zhao(赵军龙) Preparation of entangled W states based on the cavity QED system 2024 Chin. Phys. B 33 090306
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