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Einstein-Podolsky-Rosen纠缠态光场是实现基于光纤的连续变量量子信息处理的重要量子光源, 其在光纤信道分发时会与信道相互作用发生解纠缠, 影响量子信息处理的性能. 本文利用部分转置正定判据分析了Einstein-Podolsky-Rosen纠缠态光场在单通道和双通道光纤信道分发方案中, 其初始态的关联正交分量对称性、模式对称性、纯度和光纤信道额外噪声对传输距离、纠缠态光场的纠缠特性及鲁棒性的影响. 在单通道和双通道方案中, 光纤信道的额外噪声都会引起纠缠态光场的解纠缠, 随着噪声的增大, 传输距离迅速减小. 要保持Einstein-Podolsky-Rosen纠缠态光场在光纤损耗信道中的纠缠鲁棒性, 双通道方案比单通道方案对初始态的关联正交分量对称性和纯度方面的要求更为苛刻. 而且单光纤噪声通道分发方案对模式对称性参数不敏感, 模式对称性参数变化不会引起解纠缠, 也不影响最大传输距离和纠缠鲁棒性特征; 在双光纤噪声通道分发时, 模式不对称参数降低会减小最大传输距离, 并出现纠缠突然死亡.
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关键词:
- 连续变量Einstein-Podolsky-Rosen纠缠态光场 /
- 光纤信道 /
- 鲁棒性 /
- 解纠缠
Einstein-Podolsky-Rosen (EPR)-entangled state light field at a telecommunication wavelength of 1.5 μm is an important quantum source for realizing the continuous variable quantum information processing and some quantum protocols over optical fiber channel. When the EPR-entangled state light field is distributed over the optical fiber channel, the disentanglement is always present because the the EPR entangled state interacts with the fiber channel. It affects the performance of quantum information processing. In this paper, we theoretically calculate the positive partial transposition (PPT) of the entangled state distributed over the optical fiber channel in the single-channel and dual-channel distribution scheme, respectively. Three types of initial entangled light field are considered and analyzed, they being an initial EPR entangled state, an EPR entangled state with asymmetric quadratures, and an EPR entangled state with asymmetric modes. Furthermore, the influence of the extra noise in the optical fiber on the transmission distance of EPR entangled state over the optical fiber channel is investigated. In the single-channel scheme or dual-channel scheme, the extra noise in the optical fiber channel leads the entangled state light field to be disentangled, and the transmission distance of EPR entangled state over the optical fiber channel to decrease rapidly with the increase of the extra noise. For maintaining the robustness of EPR entangled states in lossy optical fiber channels, the dual-channel scheme has more stringent requirements for the correlation quadrature symmetry and purity of the initial entangled state than the single-channel scheme. In the single fiber noise channel scheme, the maximum transmission distance and the robustness of the EPR entangled states with asymmetric modes are not sensitive to the asymmetry between modes. The change of asymmetry between modes does not lead to being disentangled. The maximum transmission distance does not change either. However, the decrease of asymmetry between modes results in the disentanglement in the double fiber noise channels’ scheme. The maximum transmission distance is reduced and the sudden death occurs to the entanglement. The present results will lay a foundation for continuous variables quantum information processing based on optical fiber, such as realizing continuous variables quantum communication over optical fiber and constructing metropolitan quantum network over optical fiber.-
Keywords:
- continuous variable Einstein-Podolsky-Rosen entangled state /
- optical fiber channel /
- robustness /
- disentanglement
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图 1 EPR纠缠态光场在光纤信道的分发方案 (a)双通道方案; (b)单通道方案
Fig. 1. Distribution scheme of EPR entangled state over optical fiber: (a) Dual-channel scheme; (b) single-channel scheme.
图 2 理想EPR纠缠态光场在光纤信道中的传输特性 (a) LO光功率为0 mW; (b) LO光功率为0.05 mW; (c) LO光功率为0.1 mW; (d) LO光功率为0.2 mW
Fig. 2. Transmission characteristics of ideal EPR entangled state over optical fiber channel: (a) The power of the LO is 0 mW; (b) the power of the LO is 0.05 mW; (c) the power of the LO is 0.1 mW; (d) the power of the LO is 0.2 mW.
图 3 关联正交分量不对称的EPR纠缠态光场在光纤信道中的传输特性 (a)单光纤通道; (b)双光纤通道
Fig. 3. Transmission characteristics of EPR entangled state with asymmetric quadratures over optical fiber channel: (a) Single-fiber-channel situation; (b) dual-fiber-channel situation.
图 4 模式不对称的EPR纠缠态光场在光纤信道中的传输特性 (a)单光纤通道; (b)双光纤通道
Fig. 4. Transmission characteristics of EPR entangled state with asymmetric modes over optical fiber channel: (a) Single-fiber-channel situation; (b) dual- fiber-channel situation.
图 5 EPR纠缠态光场在光纤信道中的鲁棒性 (a)
$ 0 \leqslant \mu \leqslant 1 $ ,$ 0 \leqslant \kappa \leqslant 1 $ ; (b)$ \mu = 0.6 $ ,$ \kappa = 0.4 $ ; (c)$ \mu = 0.6 $ ,$ \kappa = 0.3 $ Fig. 5. Robustness of EPR entangled state over optical fiber channel: (a)
$ 0 \leqslant \mu \leqslant 1 $ ,$ 0 \leqslant \kappa \leqslant 1 $ ; (b)$ \mu = 0.6 $ ,$ \kappa = 0.4 $ ; (c)$ \mu = 0.6 $ ,$ \kappa = 0.3 $ . -
[1] Kimble H J 2008 Nature 453 1023
Google Scholar
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Google Scholar
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Google Scholar
[4] Furusawa A, Sørensen J L, Braunstein S L, Fuchs C A, Kimble H J, Polzik E S 1998 Science 282 706
Google Scholar
[5] Li X Y, Pan Q, Jing J T, Zhang J, Xie C D, Peng K C 2002 Phys. Rev. Lett. 88 047904
Google Scholar
[6] Jing J T, Zhang J, Yan Y, Zhao F G, Xie C D, Peng K C 2003 Phys. Rev. Lett. 90 167903
Google Scholar
[7] Yu T, Eberly J H 2004 Phys. Rev. Lett. 93 140404
Google Scholar
[8] Yu T, Eberly J H 2009 Science 323 598
Google Scholar
[9] Almeida M P, Melo F D, Hor-Meyll M, Salles A, Walborn S P, Ribeiro P H S, Davidovich L 2007 Science 316 579
Google Scholar
[10] Vidal G, Tarrach R 1999 Phys. Rev. A 59 141
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[16] 印娟, 雍海林, 吴裕平, 彭承志 2011 60 060307
Google Scholar
Yin J, Yong H L, Wu Y P, Peng C Z 2011 Acta Phys. Sin. 60 060307
Google Scholar
[17] Valivarthi R, Puigibert M G, Zhou Q, Aguilar G H, Verma V B, Marsili F, Shaw M D, Nam S W, Oblak D, Tittel W 2016 Nat. Photon. 10 676
Google Scholar
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Google Scholar
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Google Scholar
[20] 万振菊, 冯晋霞, 成健, 张宽收 2018 67 024203
Google Scholar
Wan Z J, Feng J, Cheng J, Zhang K S 2018 Acta Phys. Sin. 67 024203
Google Scholar
[21] Simon R 2000 Phys. Rev. Lett. 84 2726
Google Scholar
[22] Jouguet P, Kunz-Jacques S, Leverrier A, Grangier P, Diamanti E 2013 Nat. Photon. 7 378
Google Scholar
[23] Wang N, Du S N, Liu W Y, Wang X Y, Li Y M, Peng K C 2018 Phys. Rev. Appl. 10 064028
Google Scholar
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