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不同光学网络结构玻色采样发生随机光子损失的模拟研究

季阳 陈美玲 黄汛 吴永政 兰冰

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不同光学网络结构玻色采样发生随机光子损失的模拟研究

季阳, 陈美玲, 黄汛, 吴永政, 兰冰

Simulation of random photon loss in boson sampling of different optical networks

Ji Yang, Chen Mei-Ling, Huang Xun, Wu Yong-Zheng, Lan Bing
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  • 玻色采样机是最有可能真正意义上实现量子优势的专用量子计算机之一, 其在量子化学等领域也有着很好的应用前景. 然而, 光子损失相关的噪声会引起玻色采样样本的误差. 为了研究光子损失对玻色采样的影响, 基于等效分束器原理, 对玻色采样展开经典的模拟研究. 对于对应任意幺正矩阵的两种光学网络, 当在每一个光学单元中有一定概率发生光子损失时, 发现具有Clements结构光学网络的玻色采样相比于Reck结构的样本误差更小. 进一步地, 当光子损失的概率符合正态分布时, 发现若光子损失概率平均值不变, 标准差越大, 玻色采样的样本误差越大. 最后, 考虑输出光子数的实验结果表明, 随着光子损失概率的提高, 无光子损失的输出组合比例急剧下降, 说明光子损失会明显影响玻色采样的量子优势. 随机光子损失的玻色采样模拟研究有助于玻色采样实验的开展, 为含噪声量子计算研究提供思路.
    Boson sampling is a candidate for quantum protocols to truly realize the quantum computation advantage and to be used in advanced fields where complex computations are needed, such as quantum chemistry. However, this proposal is hard to achieve due to the existence of noise sources such as photon losses. In order to quantificationally analyze the influences of photon losses in optical networks, boson sampling is classically simulated based on the equivalent beam splitter mechanism, where the photon loss happening in optical units is equivalent to the photon transmission into the environmental paths through a virtual beam splitter. In our simulation, networks corresponding to random unitary matrices are made up, considering both the Reck structure and the Clements structure. The photon loss probability in an optical unit is well controlled by adjusting the parameters of the virtual beam splitter. Therefore, to simulate boson sampling with photon losses in optical networks is actually to simulate ideal boson sampling with more modes. It is found that when the photon loss probability is constant, boson sampling with Clements structures distinctly performs much better than that with Reck structures. Furthermore, the photon loss probability is also set to follow the normal distribution, which is thought to be closer to the situation in reality. It is found that when the mean value of photon loss probability is constant, for both network structures, errors of outputs become more obvious with the increase of standard deviation. It can be inferred that the increase of error rate can be explained by the network depth and the conclusion is suitable for larger-scale boson sampling. Finally, the number of output photons is taken into consideration, which is directly related to the classical computation complexity. It is found that with the photon loss probability, the ratio of output combinations without photon losses decreases sharply, implying that photon losses can obviously affect the quantum computation advantage of boson sampling. Our results indicate that photon losses can result in serious errors for boson sampling, even with a stable network structure such as that of Clements. This work is helpful for boson sampling experiments in reality and it is desired to develop a better protocol, for example, a well-designed network or excellent optical units, to well suppress photon losses.
      通信作者: 陈美玲, cml13262283846@163.com
    • 基金项目: 量子信息技术上海市市级科技重大专项子项目(批准号: 2019SHZDZX01-ZX03)、 中国电子科技集团公司发展部“量子计算与模拟技术研究”项目(批准号: GQ201173-00)和中国电子科技集团公司第三十二研究所“量子计算的实用化应用研究”项目(批准号: GY200906-00)
      Corresponding author: Chen Mei-Ling, cml13262283846@163.com
    • Funds: Project supported by the sub-project of Science and Technology Major Project of the Ministry of Science and Technology of Shanghai (Grant No. 2019SHZDZX01-ZX03), the project of “Quantum Computing and Simulation Technology Research” of the development department of China Electronics Technology Group Corporation (Grant No. GQ201173-00), and the project of “Practical Application Research of Quantum Computing” of the 32nd Research Institute of China Electronics Technology Group Corporation (Grant No. GY200906-00).
    [1]

    Shor P W 1994 Proceedings 35th Annual Symposium on Foundations of Computer Science Santa Fe, NM, USA, IEEE p124

    [2]

    Grover L K 1997 Phys. Rev. Lett. 79 325Google Scholar

    [3]

    Spring J B, Metcalf B J, Humphreys P C, Kolthammer W S, Jin X M, Barbieri M, Datta A., Thomas N, Langford N K, Kundys D, Gates J C, Smith B J, Smith P G, Walmsley I A 2013 Science 339 798Google Scholar

    [4]

    Zhong H S, Wang H, Deng Y H, Chen M C, Peng L C, Luo Y H, Qin J, Wu D, Ding X, Hu Y H, Yang X Y, Zhang W J, Li H, Li Y X, Jiang X, Gan L, Yang G G, You L X, Wang Z, Li L, Liu N L, Lu C Y, Pan J W 2020 Science 370 1460Google Scholar

    [5]

    Zhong H S, Li Y, Li W, Peng L C, Su Z E, Hu Y, He Y M, Ding X, Zhang W J, Li H, Zhang L, Wang Z, You L X, Wang X L, Jiang X, Li L, Chen Y A, Liu N L, Lu C Y, Pan J W 2018 Phys. Rev. Lett. 121 250505Google Scholar

    [6]

    Wang H, Li W, Jiang X, He Y M, Li Y H, Ding X, Chen M C, Qin J, Peng C Z, Schneider C, Kamp M, Zhang W J, Li H, You LX, Wang Z, Dowling J P, Höfling S, Lu C Y, Pan J W 2018 Phys. Rev. Lett. 120 230502Google Scholar

    [7]

    Peropadre B, Guerreschi G G, Huh J, Aspuru-Guzik A 2016 Phys. Rev. Lett. 117 140505Google Scholar

    [8]

    Aaronson S, Arkhipov A 2011 Proceedings of the forty-third annual ACM symposium on Theory of computing San Jose, California, June 6–8, 2011 p333

    [9]

    Spagnolo N, Vitelli C, Bentivegna M, Brod D J, Crespi A, Flamini F, Giacomini S, Milani G, Ramponi R, Mataloni P, Osellame R, Galvão E F, Sciarrino F 2014 Nat. Photonics 8 615Google Scholar

    [10]

    Bentivegna M, Spagnolo N, Vitelli C, Brod D J, Crespi A, Flamini F, Ramponi R, Mataloni P, Osellame R, Galvão E F, Sciarrino F 2015 Int. J. Quantum. Inf. 12 1560028Google Scholar

    [11]

    Agresti I, Viggianiello N, Flamini F, Spagnolo N, Crespi A, Osellame R, Wiebe N, Sciarrino F 2017 Phys. Rev. X 9 2160Google Scholar

    [12]

    Huh J, Guerreschi G G, Peropadre B, Mcclean J R, Aspuru-Guzik A 2015 Nat. Photonics 9 615Google Scholar

    [13]

    Renema1 J J, Shchesnovich V, Garcia Patron R 2019 arXiv: 1809.01953 v2 [quant-ph]

    [14]

    Tichy C M 2015 Phys. Rev. A 91 022316Google Scholar

    [15]

    Renema J J, Menssen A, Clements W R, Triginer G, Kolthammer W S, Walmsley I A 2018 Phys. Rev. Lett. 120 220502Google Scholar

    [16]

    Wang H, He Y, Li Y H, Su Z E, Li B, Huang H L, Ding X, Chen M C, Liu C, Qin J, Li J P, He Y M, Schneider C, Kamp M, Peng C Z, Höfling S, Lu C Y, Pan J W 2017 Nat. Photonics 11 361Google Scholar

    [17]

    García-Patrón R, Renema J J, Shchesnovich V 2019 Quantum 3 169Google Scholar

    [18]

    Oszmaniec M, Brod D J 2018 New J. Phys. 20 092002Google Scholar

    [19]

    Clements W R, Humphreys P C, Metcalf B J, Steven K W, Walsmley I A 2016 Optica 3 1460Google Scholar

    [20]

    Reck M, Zeilinger A, Bernstein H J, Bertani P 1994 Phys. Rev. Lett. 73 58Google Scholar

    [21]

    Brod D J, Galvão E F, Crespi A, Osellame R, Spagnolo N, Sciarrino F 2019 Adv. Photon. 1 034001Google Scholar

    [22]

    Neville A, Sparrow C, Clifford R, Johnston E, Birchall P M, Montanaro A, Laing A 2017 Nat. Phys. 13 1153Google Scholar

    [23]

    Clifford P, Clifford R 2018 Proceedings of the Twenty-Ninth Annual ACM-SIAM Symposium on Discrete Algorithms New Orleans Louisiana January 7–10, 2018 p146

    [24]

    Aaronson S, Brod D J 2015 Phys. Rev. A 93 012335Google Scholar

    [25]

    Miller D A B 2015 Optica 2 8Google Scholar

    [26]

    Wang H, Qin J, Ding X, Chen M C, Chen S, You X, He Y M, Jiang X, You L, Wang Z, Schneider C, Renema J J, Höfling S, Lu C Y, Pan J W 2019 Phys. Rev. Lett. 123 250503Google Scholar

    [27]

    Zhang R, Liu L Z, Li Z D, Fei Y Y, Yin X F, Li L, Liu N L, Mao Y, Chen Y A, Pan J W 2022 Optica 9 2Google Scholar

  • 图 1  光学线性网络示意图: (a) Reck结构; (b) Clements结构

    Fig. 1.  Sketches of optical linear networks: (a) the Reck structure; (b) the Clements structure.

    图 2  (a) 考虑光子损失的玻色采样输出组合概率的总变差距离随光子损失概率Ploss的变化关系; (b) Ploss为0.1时, 两种光学网络结构随着模式数增加对应玻色采样结果总变差距离的变化关系. 图中空心图形代表实验结果平均值, 误差棒代表标准差

    Fig. 2.  Plots between the total variation distance of boson sampling output combination probabilities considering photon losses and (a) the photon loss probability Ploss or (b) mode numbers when Ploss is 0.1. Open shapes represent mean values and error bars represent standard deviations.

    图 3  考虑光子损失的玻色采样输出组合概率的总变差距离平均值随光子损失概率的标准差σPloss的变化关系

    Fig. 3.  Plots between the mean values of total variation distance of boson sampling output combination probabilities considering photon losses and the standard deviation σPloss of photon loss probability.

    图 4  玻色采样固定光子个数的输出组合概率之和随着Ploss的变化关系. (a) Reck结构; (b) Clements结构光学网络. 图中空心图形代表实验结果平均值, 误差棒代表标准差

    Fig. 4.  Plots between the sum of boson sampling output combination probabilities with fixed photon numbers and Ploss: (a) the Reck structure; (b) the Clements structure. Open shapes represent mean values and error bars represent standard deviations.

    算法1 任意幺正矩阵符合Reck结构的分解算法[20]
    输入 任意幺正矩阵U
    输出 符合Reck结构的矩阵列表M_list
    1: M_list ← $\phi$ //初始化M_list为空集
    2: for k ← 1 to (m – 1) do //mU的维数
    3: for t ← 0 to (k – 1) do
    4:  ω ← arctan(|um–t, k–t/um–t, k–t+1|) //计算分束器参数ω, uU中元素, 下标分别表示u所在的行数和列数
    5:  temp ← (um–t, k–t/um–t, k–t+1)cotω //计算临时变量temp
    6:  φ ← arctan(Imag(temp)/Real(temp)) //计算相移器参数φ, Imag和Real分别表示temp的虚部和实部
    7:  if |um–t, k–t+1sinω – eiφum–t, k–tcosω| ≠ 0 then
    8:   ω –ω //修正ω符号, 使得步骤10的消元能够顺利进行
    9:  M ← OpticalUnit(m, k – t, k – t + 1, ω, φ) 
       //利用(1)式计算m维光学单元矩阵, 其中分束器所在通道数为(kt)和(kt + 1), 相移器所在通道数为(kt)
    10: M_list ← (M_list, M), U UM–1  //对矩阵U进行消元
    11: end for
    12: end for
    13: M_list (M_list, U) //将消元后得到的对角矩阵放入M_list
    14: M_list←Reverse(M_list) //反向排列M_list, 使得M_list中所有元素乘积为待分解矩阵
    下载: 导出CSV
    算法2 任意幺正矩阵符合Clements结构的分解算法[19]
    输入 任意幺正矩阵U
    输出 符合Clements结构的矩阵列表M_list
    1: M_list ← M_list1 M_list2M_list3ω_list←$\phi$
      //初始化M_list为空集, 并初始化辅助集合M_list1, M_list2, M_list3以及ω_list为空集
    2: for k ← 1 to (m – 1) do //mU的维数
    3: for t← 0 to (k – 1) do
    4:  if k mod 2 ≠ 0 then
    5:   Compute(ω, φ) //根据算法1计算ω, φ
    6:   M ← OpticalUnit(m, kt, kt + 1, ω, φ)
    7:   M_list1 ← (M_list1, M), U UM–1  //若k为奇数, 则利用M–1右乘U, 对U进行消元
    8:  else
    9:    ω ← –arctan(|umk+t+1, t+1/umk+t, t+1|)
    10:    temp ← –(umk+t+1, t+1/umk+t, t+1)cotω
    11:   φ ← arctan(Imag(temp)/Real(temp))
    12:    if |umk+t+1, t+1cosω + eiφumk+t, t+1sinω| ≠ 0 then
    13:     ω ← –ω //修正ω符号, 使得步骤15的消元能够顺利进行
    14:   M ← OpticalUnit(m, mk + t, mk + t + 1, ω, φ)
    15:   ω_list (ω_list, ω), M_list2 (M_list2, M), U MU //若k为偶数, 则利用M左乘U, 对U进行消元
    16: end for
    17: end for
    18: ω_list←Reverse(ω_list), M_list2←Reverse(M_list2), D U, p ← 1
      //U经过消元变换为对角矩阵D, 待分解矩阵可以表示为形如M–1M–1···M–1DMM···M的形式
    19: for k ← (m – 1) to 1 by –1 do
    20: for t ← (k – 1) to 0 by –1 do
    21:  if k mod 2 = 0 then
    22:   ω ← |ωp| //计算M'的分束器参数ω, ωpω_list的第p个元素
    23:   temp ← –tanωcotωpdmk+t/dmk+t+1 //d表示D的对角元素, 下标表示d所在行(列)数
    24:   φ ← arctan(Imag(temp)/Real(temp)) //计算M'的相移器参数φ
    25:   if |dmk+tsinωp + eiφdmk+t+1cosωp| ≠ 0 then
    26:     ω ← –ω //修正ω符号
    27:     Compute(φ) //在得到修正的ω后, 根据步骤23和24计算φ, 使得$ \boldsymbol D' \boldsymbol M'= \boldsymbol M_p^{-1} \boldsymbol D $, 其中MpM_list2的第p个元素
    28:   M M' ← OpticalUnit(m, mk + t, mk + t + 1, ω, φ) //计算M'并赋值给M
    29:   M_list3(M_list3, M), $ \boldsymbol D← \boldsymbol D'← \boldsymbol M_p^{-1} \boldsymbol D \boldsymbol M^{-1} $ , pp + 1 //计算D'并赋值给 D
    30: end for
    31: end for
    32: M_list3←(M_list3, D) //将对角矩阵放入M_list3
    33: M_list1←Reverse(M_list1), M_list3←Reverse(M_list3)
    34: M_list←(M_list3, M_list1) //M_list中所有元素乘积为待分解矩阵
    下载: 导出CSV
    算法3 考虑光子损失的玻色采样输出组合概率算法
    输入 输入组合S, 输出组合T, m维光学网络矩阵U, 单条实际光路在单个光学单元处的光子损失概率Ploss
    输出 输出组合概率Pout
    1: M_list ← Decompose(U) //按照Reck或Clements结构分解矩阵U
    2: A M1$\oplus $Em(m 1), M1M_list //将对角矩阵的维度扩展为m2
    3: for k ← 2 to (m(m – 1)/2 + 1) do
    4: Mk Mk$\oplus $Em(m – 1), MkM_list  //将光学单元矩阵的维度扩展为m2
    5: ω ← arccos(1 – (1 – Ploss)1/2) //计算虚构分束器参数ω
    6: Compute(ch) //确定原始光学单元所在通道数ch和(ch + 1)
    7: B ← OpticalUnit(m2, ch, m + 2k – 3, ω, 0), B' ← OpticalUnit(m2, ch + 1, m + 2k – 2, ω, 0)
       //构造单个光学单元中的2个虚构分束器矩阵
    8: A AMkBB' //构造考虑光子损失的等效光学网络矩阵
    9: end for
    10: S ← (S, [0]m(m–1)) //将输入组合维度变为m2
    11: Pout ← ∑T' | Perm(AS, (T, T' ))|2, T' ∈{0, 1}m(m–1) //Perm()表示矩阵积和式函数, T' 中所有元素之和为损失光子数
    下载: 导出CSV
  • [1]

    Shor P W 1994 Proceedings 35th Annual Symposium on Foundations of Computer Science Santa Fe, NM, USA, IEEE p124

    [2]

    Grover L K 1997 Phys. Rev. Lett. 79 325Google Scholar

    [3]

    Spring J B, Metcalf B J, Humphreys P C, Kolthammer W S, Jin X M, Barbieri M, Datta A., Thomas N, Langford N K, Kundys D, Gates J C, Smith B J, Smith P G, Walmsley I A 2013 Science 339 798Google Scholar

    [4]

    Zhong H S, Wang H, Deng Y H, Chen M C, Peng L C, Luo Y H, Qin J, Wu D, Ding X, Hu Y H, Yang X Y, Zhang W J, Li H, Li Y X, Jiang X, Gan L, Yang G G, You L X, Wang Z, Li L, Liu N L, Lu C Y, Pan J W 2020 Science 370 1460Google Scholar

    [5]

    Zhong H S, Li Y, Li W, Peng L C, Su Z E, Hu Y, He Y M, Ding X, Zhang W J, Li H, Zhang L, Wang Z, You L X, Wang X L, Jiang X, Li L, Chen Y A, Liu N L, Lu C Y, Pan J W 2018 Phys. Rev. Lett. 121 250505Google Scholar

    [6]

    Wang H, Li W, Jiang X, He Y M, Li Y H, Ding X, Chen M C, Qin J, Peng C Z, Schneider C, Kamp M, Zhang W J, Li H, You LX, Wang Z, Dowling J P, Höfling S, Lu C Y, Pan J W 2018 Phys. Rev. Lett. 120 230502Google Scholar

    [7]

    Peropadre B, Guerreschi G G, Huh J, Aspuru-Guzik A 2016 Phys. Rev. Lett. 117 140505Google Scholar

    [8]

    Aaronson S, Arkhipov A 2011 Proceedings of the forty-third annual ACM symposium on Theory of computing San Jose, California, June 6–8, 2011 p333

    [9]

    Spagnolo N, Vitelli C, Bentivegna M, Brod D J, Crespi A, Flamini F, Giacomini S, Milani G, Ramponi R, Mataloni P, Osellame R, Galvão E F, Sciarrino F 2014 Nat. Photonics 8 615Google Scholar

    [10]

    Bentivegna M, Spagnolo N, Vitelli C, Brod D J, Crespi A, Flamini F, Ramponi R, Mataloni P, Osellame R, Galvão E F, Sciarrino F 2015 Int. J. Quantum. Inf. 12 1560028Google Scholar

    [11]

    Agresti I, Viggianiello N, Flamini F, Spagnolo N, Crespi A, Osellame R, Wiebe N, Sciarrino F 2017 Phys. Rev. X 9 2160Google Scholar

    [12]

    Huh J, Guerreschi G G, Peropadre B, Mcclean J R, Aspuru-Guzik A 2015 Nat. Photonics 9 615Google Scholar

    [13]

    Renema1 J J, Shchesnovich V, Garcia Patron R 2019 arXiv: 1809.01953 v2 [quant-ph]

    [14]

    Tichy C M 2015 Phys. Rev. A 91 022316Google Scholar

    [15]

    Renema J J, Menssen A, Clements W R, Triginer G, Kolthammer W S, Walmsley I A 2018 Phys. Rev. Lett. 120 220502Google Scholar

    [16]

    Wang H, He Y, Li Y H, Su Z E, Li B, Huang H L, Ding X, Chen M C, Liu C, Qin J, Li J P, He Y M, Schneider C, Kamp M, Peng C Z, Höfling S, Lu C Y, Pan J W 2017 Nat. Photonics 11 361Google Scholar

    [17]

    García-Patrón R, Renema J J, Shchesnovich V 2019 Quantum 3 169Google Scholar

    [18]

    Oszmaniec M, Brod D J 2018 New J. Phys. 20 092002Google Scholar

    [19]

    Clements W R, Humphreys P C, Metcalf B J, Steven K W, Walsmley I A 2016 Optica 3 1460Google Scholar

    [20]

    Reck M, Zeilinger A, Bernstein H J, Bertani P 1994 Phys. Rev. Lett. 73 58Google Scholar

    [21]

    Brod D J, Galvão E F, Crespi A, Osellame R, Spagnolo N, Sciarrino F 2019 Adv. Photon. 1 034001Google Scholar

    [22]

    Neville A, Sparrow C, Clifford R, Johnston E, Birchall P M, Montanaro A, Laing A 2017 Nat. Phys. 13 1153Google Scholar

    [23]

    Clifford P, Clifford R 2018 Proceedings of the Twenty-Ninth Annual ACM-SIAM Symposium on Discrete Algorithms New Orleans Louisiana January 7–10, 2018 p146

    [24]

    Aaronson S, Brod D J 2015 Phys. Rev. A 93 012335Google Scholar

    [25]

    Miller D A B 2015 Optica 2 8Google Scholar

    [26]

    Wang H, Qin J, Ding X, Chen M C, Chen S, You X, He Y M, Jiang X, You L, Wang Z, Schneider C, Renema J J, Höfling S, Lu C Y, Pan J W 2019 Phys. Rev. Lett. 123 250503Google Scholar

    [27]

    Zhang R, Liu L Z, Li Z D, Fei Y Y, Yin X F, Li L, Liu N L, Mao Y, Chen Y A, Pan J W 2022 Optica 9 2Google Scholar

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  • PDF下载量:  40
  • 被引次数: 0
出版历程
  • 收稿日期:  2022-02-25
  • 修回日期:  2022-06-06
  • 上网日期:  2022-09-16
  • 刊出日期:  2022-10-05

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