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Shi X, Wang Z, Xiao J, Li L, Wei S, Guo Z, Wang Y, Wang W. Entanglement generation by strong coupling between surface lattice resonance and exciton in an Al nanoarray-coated WS 2 quantum emitter. NANOSCALE RESEARCH LETTERS 2023; 18:32. [PMID: 36877371 DOI: 10.1186/s11671-023-03804-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 02/16/2023] [Indexed: 05/24/2023]
Abstract
Strong light-matter interaction plays a central role in realizing quantum photonic technologies. The entanglement state, which results from the hybridization of excitons and cavity photons, forms the foundation of quantum information science. In this work, an entanglement state is achieved by manipulating the mode coupling between surface lattice resonance and quantum emitter into the strong coupling regime. At the same time, a Rabi splitting of 40 meV is observed. A full quantum model based on the Heisenberg picture is used to describe this unclassical phenomenon, and it perfectly explains the interaction and dissipation process. In addition, the observed concurrency degree of the entanglement state is 0.5, presenting the quantum nonlocality. This work effectively contributes to the understanding of nonclassical quantum effects arising from strong coupling and will intrigue more interesting potential applications in quantum optics.
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Affiliation(s)
- Xiaoqi Shi
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Zhihang Wang
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Jiamin Xiao
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Lingyao Li
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Shibo Wei
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Zhicheng Guo
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Yi Wang
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China
| | - Wenxin Wang
- College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, 150001, China.
- Qingdao Innovation and Development Base, Harbin Engineering University, Qingdao, 266500, China.
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Realization of Quantum Swap Gate and Generation of Entangled Coherent States. Symmetry (Basel) 2022. [DOI: 10.3390/sym14091951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The cross fusion of quantum mechanics and information science forms quantum information science. Quantum logic gates and quantum entanglement are very important building blocks in quantum information processing. In this paper, we propose one-step schemes for realizing quantum swap gates and generating two-mode entangled coherent states via circuit QED. In our scheme, due to the adiabatic elimination of the excited state of the qutrit under the condition of large detuning, the decoherence of the spontaneous emission of the qutrit can be ignored. The fidelity of the quantum swap gate remains at a very high level. In addition, we also explore the nonclassical properties of two-mode entangled coherent states prepared in our scheme by addressing the second-order correlation function and intermodal squeezing. In particular, two classes of entangled coherent states demonstrate distinct entanglement and nonclassical behavior.
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Teja GP, Goyal SK. Studying the effect of fluctuating environment on intra-atomic frequency comb based quantum memory. Sci Rep 2021; 11:11439. [PMID: 34075150 PMCID: PMC8169738 DOI: 10.1038/s41598-021-90945-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 05/17/2021] [Indexed: 11/30/2022] Open
Abstract
In this article, we study the effect of various environmental factors on intra-atomic frequency comb (I-AFC) based quantum memory. The effect of the environment is incorporated as random fluctuations and non-uniformity in the parameters such as comb spacing and the optical depth, of the frequency comb. We found that the I-AFC is viable for photon storage even for very large fluctuations in the parameters of the frequency comb, which makes I-AFC a robust platform for photon storage. Furthermore, we show that the non-uniform frequency combs without any fluctuations in the comb parameters can also yield efficient quantum memory. Since the intra-atomic frequency combs found in natural atomic systems are often non-uniform, our results suggest that a large class of these systems can be used for I-AFC based efficient quantum memory.
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Affiliation(s)
- G P Teja
- Indian Institute of Science Education and research, Mohali, Punjab, 140306, India.
| | - Sandeep K Goyal
- Indian Institute of Science Education and research, Mohali, Punjab, 140306, India
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