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Ion trap is one of the leading physical platforms to implement quantum computation. Currently, high-fidelity elementary quantum operations above the fault-tolerant threshold, including state preparation, measurement and universal gates, have been demonstrated for tens of ionic qubits. One important future research direction is to further enlarge the qubit number to the scale required for solving practical problems while maintaining the high performance of individual qubits. This paper introduces the current mainstream schemes for scalable ion trap quantum computation like quantum charge-coupled device (QCCD) and ion-photon quantum network, and describes the main limiting factors in current research. Then we further explore new schemes to scale up the qubit number like two-dimensional ion crystals and dual-type qubit, and discuss the future research directions.
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Keywords:
- quantum computation /
- ion trap /
- qubit
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图 2 利用一对正交放置的声光偏转器进行二维单独寻址[26]. 图中AOD1和AOD2, AOD1' 和AOD2' 各为一对正交放置的声光偏转器, 各自可进行水平和竖直方向的单独寻址
Fig. 2. Individual addressing in 2D through a pair of cross-placed AODs[26]. Here AOD1 and AOD2, and AOD1' and AOD2', are two pairs of cross-placed AODs, each of which can achieve individual addressing in the horizontal and vertical directions.
图 3 镱-171离子的双重类型量子比特方案[27], 编码在S1/2和F7/2超精细能级上的量子比特共振频率不同, 串扰误差小于量子纠错阈值, 且可通过双色窄带激光进行经由D5/2能级过渡进行相干转换
Fig. 3. Dual-type qubit scheme for 171Yb+ ion[27]. Qubits encoded in S1/2 and F7/2 hyperfine levels have distinct resonant frequencies, thus leading to a crosstalk error below the threshold of fault-tolerant quantum computing. The two qubit types can be coherently converted into each other by bichromatic narrow-band laser via intermediate D5/2 levels.
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[1] Cirac J I, Zoller P 1995 Phys. Rev. Lett. 74 4091
Google Scholar
[2] Moses S A, Baldwin C H, Allman M S, et al. 2023 arXiv 2305.03828
[3] Ryan-Anderson C, Brown N C, Allman M S, et al. 2022 arXiv 2208.01863
[4] Bruzewicz C D, Chiaverini J, Mcconnell R, Sage J M 2019 Appl. Phys. Rev. 6 021314
Google Scholar
[5] Harty T P, Allcock D T C, Ballance C J, Guidoni L, Janacek H A, Linke N M, Stacey D N, Lucas D M 2014 Phys. Rev. Lett. 113 220501
Google Scholar
[6] Ballance C J, Harty T P, Linke N M, Sepiol M A, Lucas D M 2016 Phys. Rev. Lett. 117 060504
Google Scholar
[7] Gaebler J P, Tan T R, Lin Y, Wan Y, Bowler R, Keith A C, Glancy S, Coakley K, Knill E, Leibfried D, Wineland D J 2016 Phys. Rev. Lett. 117 060505
Google Scholar
[8] Egan L, Debroy D M, Noel C, Risinger A, Zhu D, Biswas D, Newman M, Li M, Brown K R, Cetina M, Monroe C 2021 Nature 598 281
Google Scholar
[9] Zhang J, Pagano G, Hess P W, Kyprianidis A, Becker P, Kaplan H, Gorshkov A V, Gong Z X, Monroe C 2017 Nature 551 601
Google Scholar
[10] Li B W, Wu Y K, Mei Q X, Yao R, Lian W Q, Cai M L, Wang Y, Qi B X, Yao L, He L, Zhou Z C, Duan L M 2023 PRX Quantum 4 010302
Google Scholar
[11] Wineland D J, Monroe C, Itano W M, Leibfried D, King B E, Meekhof D M 1998 J. Res. Natl. Inst. Stand. Technol. 103 259
Google Scholar
[12] Pagano G, Hess P W, Kaplan H B, Tan W L, Richerme P, Becker P, Kyprianidis A, Zhang J, Birckelbaw E, Hernandez M R, Wu Y, Monroe C 2019 Quantum Sci. Technol. 4 014004
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Google Scholar
[14] Kielpinski D, Monroe C, Wineland D J 2002 Nature 417 709
Google Scholar
[15] Duan L M, Monroe C 2010 Rev. Mod. Phys. 82 1209
Google Scholar
[16] Hucul D, Inlek I V, Vittorini G, Crocker C, Debnath S, Clark S M, Monroe C 2015 Nat. Phys. 11 37
Google Scholar
[17] Stephenson L J, Nadlinger D P, Nichol B C, An S, Drmota P, Ballance T G, Thirumalai K, Goodwin J F, Lucas D M, Ballance C J 2020 Phys. Rev. Lett. 124 110501
Google Scholar
[18] Ballance C J, Schäfer V M, Home J P, Szwer D J, Webster S C, Allcock D T C, Linke N M, Harty T P, Aude Craik D P L, Stacey D N, Steane A M, Lucas D M 2015 Nature 528 384
Google Scholar
[19] Sosnova K, Carter A, Monroe C 2021 Phys. Rev. A 103 012610
Google Scholar
[20] Tan T R, Gaebler J P, Lin Y, Wan Y, Bowler R, Leibfried D, Wineland D J 2015 Nature 528 380
Google Scholar
[21] Drmota P, Main D, Nadlinger D P, Nichol B C, Weber M A, Ainley E M, Agrawal A, Srinivas R, Araneda G, Ballance C J, Lucas D M 2023 Phys. Rev. Lett. 130 090803
Google Scholar
[22] Szymanski B, Dubessy R, Dubost B, Guibal S, Likforman J P, Guidoni L 2012 Appl. Phys. Lett. 100 171110
Google Scholar
[23] Shen C, Duan L M 2014 Phys. Rev. A 90 022332
Google Scholar
[24] Wang S T, Shen C, Duan L M 2015 Sci. Rep. 5 8555
Google Scholar
[25] Wu Y K, Liu Z D, Zhao W D, Duan L M 2021 Phys. Rev. A 103 022419
Google Scholar
[26] Duan L M, Yang H X 2022 China Patent CN112749808B(in Chinese)[段路明, 杨蒿翔 2022 中国专利 CN112749808B
[27] Yang H X, Ma J Y, Wu Y K, Wang Y, Cao M M, Guo W X, Huang Y Y, Feng L, Zhou Z C, Duan L M 2022 Nat. Phys. 18 1058
Google Scholar
[28] Allcock D T C, Campbell W C, Chiaverini J, Chuang I L, Hudson E R, Moore I D, Ransford A, Roman C, Sage J M, Wineland D J 2021 Appl. Phys. Lett. 119 214002
Google Scholar
[29] Feng L, Huang Y Y, Wu Y K, Guo W X, Ma J Y, Yang H X, Zhang L, Wang Y, Huang C X, Zhang C, Yao L, Qi B X, Pu Y F, Zhou Z C, Duan L M 2023 arXiv 2306.14405
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