Dependence of retrieval efficiency on waist ratio of read beam to anti-Stokes photon mode in cavity-enhanced quantum memory

Fan Wen-Xin; Wang Min-Jie; Jiao Hao-Le; Lu Jia-Jin; Liu Hai-Long; Yang Zhi-Fang; Xi Meng-Qi; Li Shu-Jing; Wang Hai

doi:10.7498/aps.72.20230966

Abstract

Quantum communication is promising for absolutely safe information transmission. However, the direct transmission distance of quantum states is limited by the no-cloning theorem and transmission loss. To solve these problems, Duan et al. proposed a promising quantum repeater scheme, DLCZ protocol (Duan L M, Lukin M D, Cirac J I, Zoller P 2001 Nature 414 413), in which linear optics and atomic ensembles are used to combine entanglement generation and quantum memory into a single node. A quantum memory with highly retrieval efficiency is beneficial to increasing the rate of entanglement swapping, and also achieving high-speed entanglement distribution. Up to now, high-efficiency quantum memories have been realized by using high-optical-depth atomic ensembles or by coupling atomic ensembles with a medium-finesse optical cavity. However, the effect of the waist ratio of read beam mode and anti-Stokes photon mode on intrinsic retrieval efficiency has not been studied in detail. Here, we study the dependence of intrinsic retrieval efficiency on the waist ratio of read beam mode to anti-Stokes photon mode in cavity-enhanced quantum memory.In this work, an ⁸⁷Rb atomic ensemble, that is placed at the center of a passively stabilized polarization interferometer (BD_1,2), is used as quantum memory. Firstly, the ensemble is captured through magneto-optical trapping (MOT) and prepared into the Zeeman sub-level of ground state $ \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 1,m = 0} \right\rangle $. Then, a weak write pulse with frequency red-detuned from the $ \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 1,m = 0} \right\rangle \to \left| {5{{\text{P}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F' = 1,m = 1} \right\rangle $ transition by 110 MHz, illuminates the atoms and induces spontaneous Raman scattering out a Stokes photon. In this regime of weak excitation, the detection of a Stokes photon heralds the storage of a single spin wave $ \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 1,m = 0} \right\rangle \leftrightarrow \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 2,m = 0} \right\rangle $ ($ \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 1,m = 0} \right\rangle \leftrightarrow \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 2,m = 2} \right\rangle $) distributed among the whole ensemble. After a programmable delay, a read pulse that generates a 110 MHz red-detuning from the $ \left| {5{{\text{S}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F = 2,m = 0} \right\rangle \to \left| {5{{\text{P}}_{{1 \mathord{\left/ {\vphantom {1 2}} \right. } 2}}},F' = 2,m = - 1} \right\rangle $ transition converts this spin wave into an anti-Stokes photon. We detect the Stokes photons and anti-Stokes photons with polarization $ {\sigma ^ + } $, which means that all the spin-waves are stored in a magnetic-field-insensitive state to reduce the decoherence caused by the stray magnetic fields. In order to increase the intrinsic retrieval efficiency, the atomic ensemble is placed in a ring cavity. The cavity length is 4 m, the finesse is measured to be ~15, and the escape efficiency of ring cavity is 52.9%. Both Stokes and anti-Stokes photon qubits are required to resonate with the ring cavity. To meet this requirement, a cavity-locking beam is injected into the cavity to stabilize the cavity length by using a Pound-Drever-Hall locking scheme. Finally, we fix the Stokes (anti-Stokes) photon mode waist and change the waist ratio through changing the write beam (read beam) waist.The experimental results show that when the waist ratio of read beam mode to anti-Stokes photon mode is 3, the intrinsic retrieval efficiency reaches to $ 68.9 {\text{%}} \pm 1.6{\text{%}} $ and normalized cross-correlation function $ {g^{(2)}} $ can achieve $ 26.5 \pm 1.9 $. We build a theoretical model, which shows that the intrinsic retrieval efficiency reaches the peak when the waist ratio is 3, and the intrinsic retrieval efficiency tends to be stable when the waist ratio continues to increase. The experimental results accord with the theoretical results. In the future, we will improve the intrinsic retrieval efficiency by enhancing the fineness of the optical cavity with optimal cavity parameters.

Keywords:

Authors and contacts

1.
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
2.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Corresponding author: Li Shu-Jing, lishujing@sxu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12174235), the Fund for “1331 Project” Key Subjects Construction of Shanxi Province, China (Grant No. 1331KSC), and the Fundamental Research Program of Shanxi Province, China (Grant No. 202203021221011).

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References

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Cited By

图 1 实验能级图　(a)写过程; (b)读过程

Figure 1. Relevant ⁸⁷Rb atomic levels: (a) Writing process; (b) reading process.

DownLoad: Full-Size Img PowerPoint

图 2 实验装置图, 其中BD为光移束器, PZT为压电陶瓷, OSFS为光谱滤波器组, SMF为单模光纤, PD为光电探测器, SPD为单光子探测器, OC为输出耦合镜

Figure 2. Experimental setup. BD, the beam displacer; PZT, the piezoelectric transducer; OSFS, optical-spectrum-filter set; SMF, single-mode fiber; PD, photodiode; SPD, singlephoton detector; OC, output coupler.

DownLoad: Full-Size Img PowerPoint

图 3 实验时序图. 自上而下依次为磁光阱、锁腔过程、态制备过程、写过程、读过程

Figure 3. Time sequence of experiment. From top to bottom, they are magneto-optical trap, the locking cavity process, the state cleaning process, the writing process, the reading procress.

DownLoad: Full-Size Img PowerPoint

图 4 读光饱和功率密度下, 本质恢复效率随腰斑比的变化. 橙色菱形为理论值, 蓝色方块为实验数据

Figure 4. Intrinsic retrieval efficiency as a function of the waist width ratio under the saturation power density of read. The orange diamond represents the theoretical value and the blue square represents the experimental data.

DownLoad: Full-Size Img PowerPoint

图 5 腰斑比$ \alpha = 3 $时, 本质恢复效率(蓝色方块)与互关联函数$ {g^{(2)}} $(红色圆点)随读激光功率的变化

Figure 5. Intrinsic retrieval efficiency (the blue square) and the cross-correlation function $ {g^{(2)}} $ (the red dot) as a function of read power at the waist width ratio $ \alpha = 3 $.

DownLoad: Full-Size Img PowerPoint

[1]	Zhao B, Chen Z B, Chen Y A, Schmiedmayer J, Pan J W 2007 Phys. Rev. Lett. 98 240502 Google Scholar
[2]	Duan L M, Lukin M D, Cirac J I, Zoller P 2001 Nature 414 413 Google Scholar
[3]	Sangouard N, Simon C, de Riedmatten H, Gisin N 2011 Rev. Mod. Phys. 83 33 Google Scholar
[4]	Pan J W, Simon C, Brukner Č, Zeilinger A 2001 Nature 410 1067 Google Scholar
[5]	Briegel H J, Dür W, Cirac J I, Zoller P 1998 Phys. Rev. Lett. 81 5932 Google Scholar
[6]	Pan J W, Gasparoni S, Ursin R, Weihs G, Zeilinger A 2003 Nature 423 417 Google Scholar
[7]	Reichle R, Leibfried D, Knill E, et al. 2006 Nature 443 838 Google Scholar
[8]	Matsukevich D N, Chanelière T, Bhattacharya M, et al. 2005 Phys. Rev. Lett. 95 040405 Google Scholar
[9]	Dudin Y O, Jenkins S D, Zhao R, et al. 2009 Phys. Rev. Lett. 103 020505 Google Scholar
[10]	Kuzmich A, Bowen W P, Boozer A D, Boca A, Chou C W, Duan L M, Kimble H J 2003 Nature 423 731 Google Scholar
[11]	Simon J, Tanji H, Thompson J K, Vuletić V 2007 Phys. Rev. Lett. 98 183601 Google Scholar
[12]	Matsukevich D N, Chanelière T, Jenkins S D, Lan S Y, Kennedy T A B, Kuzmich A 2006 Phys. Rev. Lett. 96 030405 Google Scholar
[13]	Yan Z H, Wu L, Jia X J, Liu Y H, Deng R J, Li S J, Wang H 2017 Nat. Commun. 8 718 Google Scholar
[14]	Perseguers S, Lapeyre G J, Cavalcanti D, Lewenstein M, Acín A 2013 Rep. Prog. Phys. 76 096001 Google Scholar
[15]	Chanelière T, Matsukevich D N, Jenkins S D, Lan S Y, Kennedy T A B, Kuzmich A 2005 Nature 438 833 Google Scholar
[16]	Eisaman M D, André A, Massou F, Fleischhauer M, Zibrov A S, Lukin M D 2005 Nature 438 837 Google Scholar
[17]	Heinze G, Hubrich C, Halfmann T 2013 Phys. Rev. Lett. 111 033601 Google Scholar
[18]	Hsiao Y F, Tsai P J, Chen H S, Lin S X, Hung C C, Lee C H, Chen Y H, Chen Y F, Yu I A, Chen Y C 2018 Phys. Rev. Lett. 120 183602 Google Scholar
[19]	Laurat J, de Riedmatten H, Felinto D, Chou C W, Schomburg E W, Kimble H J 2006 Opt. Express 14 6912 Google Scholar
[20]	Yang S J, Wang X J, Li J, Rui J, Bao X H, Pan J W 2015 Phys. Rev. Lett. 114 210501 Google Scholar
[21]	Ma L X, Lei X, Yan J L, Li R Y, Chai T, Yan Z H, Jia X J, Xie C D, Peng K C 2022 Nat. Commun. 13 2368 Google Scholar
[22]	Bao X H, Reingruber A, Dietrich P, Rui J, Dück A, Strassel T, Li L, Liu N L, Zhao B, Pan J W 2012 Nat. Phys. 8 517 Google Scholar
[23]	Yang S J, Wang X J, Bao X H, Pan J W 2016 Nat. Photonics 10 381 Google Scholar
[24]	Wang X J, Yang S J, Sun P F, Jing B, Li J, Zhou M T, Bao X H, Pan J W 2021 Phys. Rev. Lett. 126 090501 Google Scholar
[25]	Wang Y F, Li J F, Zhang S C, Su K Y, Zhou Y R, Liao K Y, Du S W, Yan H, Zhu S L 2019 Nat. Photonics 13 346 Google Scholar
[26]	Farrera P, Heinze G, Albrecht B, Ho M, Chávez M, Teo C, Sangouard N, de Riedmatten H 2016 Nat. Commun. 7 13556 Google Scholar
[27]	Gorshkov A V, André A, Lukin M D, Sørensen A S 2007 Phys. Rev. A 76 033805 Google Scholar
[28]	Nunn J, Walmsley A, Raymer M G, Surmacz K, Waldermann F C, Wang Z, Jaksch D 2007 Phys. Rev. A 75 011401 Google Scholar
[29]	Reiserer A, Rempe G 2015 Rev. Mod. Phys. 87 1379 Google Scholar
[30]	Surmacz K, Nunn J, Reim K, Lee K. C, Lorenz V. O, Sussman B, Walmsley I. A, Jaksch D 2008 Phys. Rev. A 78 033806 Google Scholar
[31]	Gujarati T P, Wu Y K, Duan L M 2018 Phys. Rev. A 97 033826 Google Scholar
[32]	Vernaz-Gris P, Huang K, Cao M, Sheremet A S, Laurat J 2018 Nat. Commun. 9 363 Google Scholar
[33]	Wang M J, Wang S Z, Ma T F, Li Y, Xie Y, Jiao H L, Liu H L, Li S J, Wang H 2023 Quantum 7 903 Google Scholar
[34]	Wang S Z, Wang M J, Wen Y F, Xv Z X, Ma T F, Li S J, Wang H 2021 Commun. Phys. 4 168 Google Scholar
[35]	Black D E 2001 Am. J. Phys. 69 79 Google Scholar
[36]	Li C, Wang H Y, Artemiy D, Riccard M O, Miao H X, Han S 2021 Results Phys. 30 104835 Google Scholar
[37]	Su J, Jiao M X, Jiang F 2018 Optik 168 348 Google Scholar
[38]	Stoyanov L, Stefanov A, Dreischuh A, Paulus G G 2023 Opt. express 31 13683 Google Scholar
[39]	Hiekkamäki M, Barros R F, Ornigotti M, Fickler R 2022 Nat. Photonics 16 828 Google Scholar
[40]	Iulia G 2023 Nat. Rev. Phys. 5 372 Google Scholar
[41]	Erpenbeck A, Gull E, Cohen G 2023 Phys. Rev. Lett. 130 186301 Google Scholar
[42]	Dum R, Zoller P, Ritsch H 1992 Phys. Rev. A 45 4879 Google Scholar

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