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Entanglement source with high entanglement degree is the guarantee for accomplishing the quantum information transmission and process with higher fidelity. Continuous variable Einstein-Podolsky-Rosen (EPR) entangled optical field with quantum correlation of amplitude and phase quadrature is a basic and important quantum resource in the quantum information science area, which can be obtained by a non-degenerate optical parametric amplifier (NOPA) operated below the threshold pump power. Because of the limitation of the imperfect performance of optical components in optical cavity, we should find efficient methods of implementing quantum manipulation to improve the entanglement degree of the entangled state of light. Connecting NOPA1 and NOPA2 in series, the entangled state of light output from the NOPA1 can be manipulated by NOPA2, and the entanglement degree can be enhanced under certain conditions. To improve the entanglement degree to a greater extent, the structure of the NOPA1 is chosen as a half-monolithic standing-wave optical resonator with the triple resonance of the pump and two subharmonic modes. The NOPA1 is able to output the entangled optical fields with an entanglement degree of 8.4 dB, which is the highest entanglement generated by a single device so far. The structure of the NOPA2 can be chosen as a standing-wave optical cavity or a four-mirror ring optical cavity. According to the different structures of the NOPA2, we theoretically design two kinds of optical systems with two cascaded cavities and compare the effects of the two optical systems on the continuous variable EPR entanglement cascaded enhancement in detail. Based on the above contrastive analysis, when the entanglement degree of the input optical fields is 8.4 dB and the transmissivity of the output coupler is lower, the structure of a four-mirror ring optical cavity for NOPA2 cannot enhance the entanglement degree, so the optical system including NOPA2 with standing wave cavity structure and the optical isolator with high transmission efficiency is appropriate. When the transmissivity of the output coupler and transmission efficiency of the optical isolator are higher, the structure of the NOPA2 should be chosen as a standing-wave optical cavity, otherwise the structure of the NOPA2 should be chosen as a four-mirror ring optical cavity. We also theoretically analyze the dependence of the correlation degree of output optical fields on physical parameters. The results show that under the conditions of higher input and output coupling efficiency, higher transmission efficiency and lower intro-cavity loss, the entangled state of light with higher entanglement degree can be obtained experimentally. This provides the reference for obtaining entangled optical fields with higher entanglement degree in the future.
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Keywords:
- Einstein-Podolsky-Rosen entangled optical fields /
- manipulated optical cavity /
- entanglement enhancement
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[35] 周瑶瑶, 蔚娟, 闫智辉, 贾晓军 2018 38 0727001
Zhou Y Y, Yu J, Yan Z H, Jia X J 2018 Acta Opt. Sin. 38 0727001
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图 1 驻波腔与四镜环形腔级联的光学系统
Figure 1. Optical system of connecting a standing wave cavity and a four-mirror ring cavity in series.
图 2 输出光场的量子关联噪声随输出镜对信号光场和闲置光场透射率之差的变化
Figure 2. Quantum correlation variances of two output beams versus the transmissivity differences of the output coupler for idle and signal fields.
图 3 两驻波腔级联的光学系统
Figure 3. Optical system of two cascaded standing wave optical cavities.
图 4 输出光场的纠缠度随光学隔离器传输效率的变化
Figure 4. Dependences of correlation degree of output optical fields on transmission efficiency of the optical isolator.
图 5 输出光场的纠缠度随输入EPR纠缠态光场纠缠度的变化
Figure 5. Dependences of correlation degree of output optical fields on correlation degree of input EPR entanglement optical fields.
图 6 输出光场的纠缠度随内腔损耗的变化
Figure 6. Dependences of correlation degree of output optical fields on intracavity loss.
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[1] Bouwmeester D, Pan J W, Mattle K, Eibl M, Weinfurter H, Zeilinger A 1997 Nature 390 575
Google Scholar
[2] Furusawa A, Sorensen J L, Braustein S L, Fuchs C A, Kimble H J, Polzik E S 1998 Science 282 706
Google Scholar
[3] Boschi D, Branca S, Marini F D, Hardy L, Popescu S 1998 Phys. Rev. Lett. 80 1121
Google Scholar
[4] Vaidman L 1994 Phys. Rev. A 49 1473
Google Scholar
[5] Braunstein S L, Kimble H J 1998 Phys. Rev. Lett. 80 869
Google Scholar
[6] Bowen W P, Schnabel R, Lam P K, Ralph T C 2004 Phys. Rev. A 69 012304
Google Scholar
[7] Eberle T, Händchen V, Duhme J, Franz T, Werner R F, Schnabel R 2011 Phys. Rev. A 83 052329
Google Scholar
[8] Mizuno J, Wakui K, Furusawa A, Sasaki M 2005 Phys. Rev. A 71 012304
Google Scholar
[9] Stoler D 1970 Phys. Rev. D 1 3217
Google Scholar
[10] Mehmet M, Vahlbruch H, Lastzka N, Danzmann K, Schnabel R 2010 Phys. Rev. A 81 013814
Google Scholar
[11] Mehmet M, Ast S, Eberle T, Steinlechner S, Vahlbruch H, Schnabel R 2011 Opt. Express 19 25763
Google Scholar
[12] Eberle T, Steinlechner S, Bauchrowitz J, Händchen V, Vahlbruch H, Mehmet M, Muller-Ebhardt H, Schnabel R 2010 Phys. Rev. Lett. 104 251102
Google Scholar
[13] Vahlbruch H, Mehmet M, Danzmann K, Schnabel R 2016 Phys. Rev. Lett. 117 110801
Google Scholar
[14] 彭堃墀, 贾晓军, 苏晓龙, 谢常德 2011 光学学报 31 09001071
Peng K C, Jia X J, Su X L, Xie C D 2011 Acta Opt. Sin. 31 09001071
[15] 贾晓军, 苏晓龙, 潘庆, 谢常德, 彭堃墀 2005 54 2717
Google Scholar
Jia X J, Su X L, Pan Q, Xie C D, Peng K C 2005 Acta Phys. Sin. 54 2717
Google Scholar
[16] 赵超樱, 谭维翰 2005 54 4526
Google Scholar
Zhao C Y, Tan W H 2005 Acta Phys. Sin. 54 4526
Google Scholar
[17] Wang Y, Su X L, Shen H, Tan A H, Xie C D, Peng K C 2010 Phys. Rev. A 81 022311
Google Scholar
[18] Ou Z Y, Pereira S F, Kimble H J, Peng K C 1992 Phys. Rev. Lett. 68 3663
Google Scholar
[19] Zhang Y, Wang H, Li X Y, Jing J T, Xie C D, Peng K C 2000 Phys. Rev. A 62 023813
Google Scholar
[20] Laurat J, Coudreau T, Keller G, Treps N, Fabre C 2004 Phys. Rev. A 70 042315
Google Scholar
[21] Takei N, Yonezawa H, Aoki T, Furusawa A 2005 Phys. Rev. Lett. 94 220502
Google Scholar
[22] Wang Y, Shen H, Jin X L, Su X L, Xie C D, Peng K C 2010 Opt. Express 18 6149
Google Scholar
[23] Gottesman D, Preskill J 2001 Phys. Rev. A 63 022309
Google Scholar
[24] Yukawa M, Benichi H, Furusawa A 2008 Phys. Rev. A 77 022314
Google Scholar
[25] Li X Y, Pan Q, Jing J T, Zhang J, Xie C D, Peng K C 2002 Phys. Rev. Lett. 88 047904
Google Scholar
[26] Mattle K, Weinfurter H, Kwiat P G, Zeilinger A 1996 Phys. Rev. Lett. 76 4656
Google Scholar
[27] Braunstein S L, Kimble H J 2000 Phys. Rev. A 61 042302
Google Scholar
[28] Zhang J, Peng K C 2000 Phys. Rev. A 62 064302
Google Scholar
[29] Zhou Y Y, Jia X J, Li F, Xie C D, Peng K C 2015 Opt. Express 23 4952
Google Scholar
[30] Chen H X, Zhang J 2009 Phys. Rev. A 79 063826
Google Scholar
[31] Shang Y N, Jia X J, Shen Y M, Xie C D, Peng K C 2010 Opt. Lett. 35 853
Google Scholar
[32] Yan Z H, Jia X J, Su X L, Duan Z Y, Xie C D, Peng K C 2012 Phys. Rev. A 85 040305(R)
Google Scholar
[33] Duan L M, Giedke G, Cirac J I, Zoller P 2000 Phys. Rev. Lett. 84 2722
Google Scholar
[34] Simon R 2000 Phys. Rev. Lett. 84 2726
Google Scholar
[35] 周瑶瑶, 蔚娟, 闫智辉, 贾晓军 2018 38 0727001
Zhou Y Y, Yu J, Yan Z H, Jia X J 2018 Acta Opt. Sin. 38 0727001
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