Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Chinese Journal of Quantum Electronics

A scheme for realization of quantum SWAP gate in cavity QED

Juan He, Ye Liu, NI Zhi-xiang

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

A scheme is proposed for the realization of quantum SWAP gate in cavity QED.We consider two three-level atoms simultaneously interact with single-mode cavity in the case of large detuning.Moreover,two classical fields are used to perform the rotations on atoms.The operation and implement course are simple and handy.In addition,during the whole course,the cavity is only virtually excited,thus the decoherence time is greatly prolonged and the demand on the quality factor of the cavity is greatly reduced.Within the present cavity QED techniques,the scheme is realizable.

Related papers

The realization of entanglement, swap gate and quantum-information transfer for two-atom with cavity QED

Rong Wang, Jin-Yue Gao

We present a scheme to realize entangled states, swap gate and quantum-information transfer for two atoms in cavity QED. The scheme does not require the transfer of quantum information between the atoms and cavity and that the cavity field is only virtually excited, thus the requirement on the quality factor of the cavity is greatly loosened.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 11, 2005•0 citations

A scheme for quantum logic gate based on coherent-state qubits in cavity QED system

Shi-Qing Tang, Shunlong Luo, Jiayi Xu

A two-qubit quantum swap gate scheme based on coherent state qubit is proposed in cavity quantum electrodynamics system. Our scheme adopt the interaction between the Λ-type atomic ensemble and the two-mode optical cavity, and the swap gate can be realized directly only one step, so as to save a lot of quantum resources and reduce the number of single qubit rotation operations in the actual quantum information processing. It is found that under the condition of large detuning limit, the excited states of atoms are adiabatically eliminated, and the decoherence caused by the spontaneous emission of atoms is effectively suppressed. All atoms in the optical cavity are universally addressed, which reduces the experimental operation difficulty of the scheme. The fidelity of the quantum logic gate is maintained at a very high level when the photon loss of the cavity field is considered. Compared with the single-atom scheme, it is found that the atom-cavity interaction time required by the atomic ensemble scheme is inversely proportional to the number of atoms, so that the speed of the quantum logic gate can be increased by N times. Therefore, in principle, as long as enough atoms interacting with the optical field, an effective coupling of any atom-cavity field can be generated, which is conducive to selecting the appropriate quantum gate operation time in practical operation and effectively avoiding decoherence.

SPIE Conference on Quantum and Nonlinear Optics•Nov 8, 2021•0 citations

Efficient scheme of quantum SWAP gate and multi-atom cluster state via cavity QED

Chunlei Jiang, Mao-Fa Fang, Yao-Hua Hu

In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the N -atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed.

Chinese Physics B•Jan 1, 2008•10 citations

A SCHEME FOR REALIZATION OF TWO-QUBIT LOGIC GATES IN CAVITY QED

Bao‐Long Fang, Hong-Bo Wan, Ye Liu

We propose a simple scheme for realizing two-qubit logic gate in cavity QED. In our scheme, the quantum controlled-not gate, phase gate and swap gate can be implemented without the ancillary level. The quantum controlled-not gate and phase gate can be realized easily by only one interaction between atoms and a highly detuned cavity mode with the assistance of a strong classical field. Thus, the scheme is insensitive to both the cavity decay and the thermal field.

Modern Physics Letters B•Jan 10, 2010•0 citations

One-step implementation of a swap gate with coherent-state qubits via atomic ensemble large detuning interaction with two-mode cavity quantum electrodynamics

Xiao‐Qiang Shao, Li Chen, Shou Zhang

We present a scheme to implement the coherent-state qubit SWAP gate. The scheme uses an atomic ensemble consisting of a three-level atom large detuning interacting with a two-mode field. Both situations, with and without cavity decay, are considered. We discuss the advantages and the experimental feasibility of our scheme.

Journal of Physics B Atomic Molecular and Optical Physics•Dec 2, 2008•12 citations

One-Step Realization of SWAP Gate with Superconducting Quantum-Interference Devices and Atoms in Cavity QED

Zhiming Zhan

We put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs (super-conducting quantum-interference devices) in cavity QED via Raman transition. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The SWAP gate is realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized. The scheme can also be used to implement the SWAP gate with atoms.

Communications in Theoretical Physics•Jun 1, 2008•1 citation
A scheme is proposed for the realization of quantum SWAP gate in cavity QED.We consider two three-level atoms simultaneously interact with single-mode cavity in the case of large detuning.Moreover,two classical fields are used to perform the rotations on atoms.The operation and implement course are simple and handy.In addition,during the whole course,the cavity is only virtually excited,thus the decoherence time is greatly prolonged and the demand on the quality factor of the cavity is greatly reduced.Within the present cavity QED techniques,the scheme is realizable.
A two-qubit quantum swap gate scheme based on coherent state qubit is proposed in cavity quantum electrodynamics system. Our scheme adopt the interaction between the Λ-type atomic ensemble and the two-mode optical cavity, and the swap gate can be realized directly only one step, so as to save a lot of quantum resources and reduce the number of single qubit rotation operations in the actual quantum information processing. It is found that under the condition of large detuning limit, the excited states of atoms are adiabatically eliminated, and the decoherence caused by the spontaneous emission of atoms is effectively suppressed. All atoms in the optical cavity are universally addressed, which reduces the experimental operation difficulty of the scheme. The fidelity of the quantum logic gate is maintained at a very high level when the photon loss of the cavity field is considered. Compared with the single-atom scheme, it is found that the atom-cavity interaction time required by the atomic ensemble scheme is inversely proportional to the number of atoms, so that the speed of the quantum logic gate can be increased by N times. Therefore, in principle, as long as enough atoms interacting with the optical field, an effective coupling of any atom-cavity field can be generated, which is conducive to selecting the appropriate quantum gate operation time in practical operation and effectively avoiding decoherence.
In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the N -atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed.
We put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs (super-conducting quantum-interference devices) in cavity QED via Raman transition. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The SWAP gate is realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized. The scheme can also be used to implement the SWAP gate with atoms.