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Dynamical decoupling refers to a family of techniques that are widely used to suppress decoherence in various quantum systems, caused by quasi-static environmental noise. They have broad applications in the field of quantum information processing. Conventional dynamical decoupling targets at noise in two-level system such as qubits and often consists of specifically engineered sequences of $ \pi $ pulses that swap between two different states. On the other hand, researchers do not limit their study within simple two-levels systems any more, but go and seek for even more efficient quantum hardware. A variety of quantum algorithms and schemes of quantum control using multi-level systems, such as qutrits and qudits, for quantum information processing have been proposed and implemented successfully. However, decoherence in such a multi-level system is inherently more sophisticated than that in two-level systems. So far there has been little systematic research on how to tackle decoherence problems in such systems.In this work, we propose several sequences of dynamical decoupling for multi-level systems that only rely on $ \pi $ pulses linking neighboring levels, which is easy to implement experimentally. Our results show that these sequences can efficiently suppress quasi-static noise presented in multi-level systems. In addition, by calculating the corresponding filter functions of these sequences, we are able to further analyze their effect on generic Gaussian noise that may not be quasi-static. We also give a physical explanation of the noise filtering mechanism of these sequences by considering their control functions. Other topics discussed in our work include power spectral density and correlation of noise in multi-level systems. Our work may be regarded as a first step towards a more systematic investigation of dynamical decoupling techniques applicable to multi-level systems.-
Keywords:
- multi-level system /
- noise /
- decoherence /
- dynamic decoupling /
- filter function
[1] Clerk A A, Devoret M H, Girvin S M, Marquardt F, Schoelkopf R J 2010 Rev. Mod. Phys. 82 1155Google Scholar
[2] Hahn E L 1950 Phys. Rev. 80 580Google Scholar
[3] Slichter C P 1990 Principles of Nuclear Magnetic Resonance (3rd Ed.) (NewYork: Springer) pp1–7
[4] Viola L, Lloyd S 1998 Phys. Rev. A 58 2733Google Scholar
[5] Carr H Y, Purcell E M 1954 Phys. Rev. 94 630Google Scholar
[6] Meiboom S, Gill D 1958 Rev. Sci. Instrum. 29 688Google Scholar
[7] Grégoire I 2005 Ph. D. Dissertation (Paris: Université Pierre et Marie Curie - Paris VI)
[8] Khodjasteh K, Lidar D A 2005 Phys. Rev. Lett. 95 180501Google Scholar
[9] Khodjasteh K, Lidar D A 2007 Phys. Rev. A 75 062310Google Scholar
[10] Uhrig G S 2007 Phys. Rev. Lett. 98 100504Google Scholar
[11] Uhrig G S 2009 Phys. Rev. Lett. 102 120502Google Scholar
[12] Uhrig G S 2008 New J. Phys. 10 083024Google Scholar
[13] Uhrig G S, Pasini S 2010 New J. Phys. 12 045001Google Scholar
[14] Bylander J, Gustavsson S, Yan F, Yoshihara F, Harrabi K, Fitch G, Oliver W D 2011 Nat. Phys. 7 565Google Scholar
[15] Gustavsson S, Bylander J, Yan F, Forn-Díaz P, Bolkhovsky V, Braje D, Oliver W D 2012 Phys, Rev. Lett. 108 170503Google Scholar
[16] Qiu J, Zhou Y, Hu C K, Yuan J, Zhang L, Chu J, Huang W, Liu W, Luo K, Ni Z, Pan X, Yu D 2021 Phys. Rev. A 16 054047Google Scholar
[17] Google 2023 Nature 614 676Google Scholar
[18] Gottesman D 1999 Chaos Solitons Fractals 10 1749Google Scholar
[19] Grassl M, Rötteler M, Beth T 2003 Inter. J. Foundat. Compu. Sci. 14 757Google Scholar
[20] Bullock S S, OLeary D P, Brennen G K 2005 Phys. Rev. Lett. 94 230502Google Scholar
[21] Campbell E T, Anwar H, Browne D E 2012 Phys. Rev. X 2 041021Google Scholar
[22] Campbell E T 2014 Phys. Rev. Lett. 113 230501Google Scholar
[23] Anwar H, Brown B J, Campbell E T, Browne D E 2014 New J. Phys. 16 063038Google Scholar
[24] Krishna A, Tillich J P 2019 Phys. Rev. Lett. 123 070507Google Scholar
[25] Chu J, He X, Zhou Y, Yuan J, Zhang L, Guo Q, Hai Y, Han Z, Hu C K, Huang W, Jia H, Yu D 2023 Nat. Phys. 19 126Google Scholar
[26] Luo K, Huang W, Tao Z, Zhang L, Zhou Y, Chu J, Liu W, Wang B, Cui J, Liu S, Yan F, Yu D 2023 Phys. Rev. Lett. 130 030603Google Scholar
[27] Blok M S, Ramasesh V V, Schuster T, O’Brien K, Kreikebaum J M, Dahlen D, Morvan A, Yoshida B, Yao N Y, Siddiqi I 2021 Phys. Rev. X 11 021010Google Scholar
[28] Suslov M V, Lesovik G B, Blatter G 2011 Phys. Rev. A 83 052317Google Scholar
[29] Bouchard F, Fickler R, Boyd R W, Karimi E 2017 Sci. Adv. 3 e1601915Google Scholar
[30] Napolitano R J, Fanchini F F, da Silva A H, Bellomo B 2021 Phys. Rev. Research 3 013235Google Scholar
[31] Mukhtar M, Saw T B, Soh W T, Gong J 2010 Phys. Rev. A 81 012331Google Scholar
[32] Koch J, Terri M Y, Gambetta J, Houck A A, Schuster D I, Majer J, Blais A, Devoret M H, Girvin S M, Schoelkopf R J 2007 Phys, Rev. A 76 042319Google Scholar
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图 1 针对三能级体系的动力学解耦脉冲序列、能级演化及控制函数 (a) 动力学解耦序列, 脉冲施加的时刻分别为
${t}_{1}, {t}_{2}, \cdots, {t}_{6}$ ,$ {t}_{0}, {t}_{6} $ 是整个序列开始和结束的时刻; (b) 不同初态在演化过程中的变化, 每个初态都走遍了不同的能级; (c), (d) 分别是$|0\rangle$ ,$|1\rangle$ 之间和$|0\rangle, \;|2\rangle$ 之间的控制函数Figure 1. Pulse sequence for dynamical decoupling, state evolution and control function in the case of a three-level system: (a) The pulse sequence;
$ \pi $ pulses are applied at time${t}_{1}, {t}_{2}, \cdots, {t}_{6},$ $ {t}_{0}, {t}_{6} $ are the start and end moments of the whole sequence; (b) evolution of different initial states; each state is sequentially flipped into all other states by the$ \pi $ pulses in the sequence; (c), (d) plot the control functions linking states$|0\rangle$ ,$|1\rangle$ and$|0\rangle$ ,$|2\rangle$ , respectively.图 4 三能级体系滤波函数的周期性 (a)
$F=\dfrac{1}{{\omega }^{2}}16{\rm{s}}{\rm{i}}{\rm{n}}{\left(\dfrac{\omega \tau }{6}\right)}^{4}$ 中的周期部分; (b)$F{\omega }^{2}, \omega \varDelta {\phi }_{{\rm{s}}{\rm{i}}{\rm{n}}\omega }$ 和$ \omega \varDelta {\phi }_{{\rm{c}}{\rm{o}}{\rm{s}}\omega } $ 之间的关系(为了方便比较将$ F{\omega }^{2} $ 除以4); (c) 噪声与控制函数的比较, 上图中噪声周期数为1.5, sin类型的噪声积累了最大的相位, cos类型的噪声与自身完全抵消; 下图中噪声周期数为3, 两种类型的噪声都与自身完全抵消Figure 4. Periodicity of the filter function in the case of a three-level system; (a) Periodic part of
$ F=\dfrac{1}{{\omega }^{2}}16{\rm{s}}{\rm{i}}{\rm{n}}{\left(\dfrac{\omega \tau }{6}\right)}^{4} $ ; (b) relation among$ F{\omega }^{2}, \omega \varDelta {\phi }_{{\rm{s}}{\rm{i}}{\rm{n}}\omega } $ and$ \omega \varDelta {\phi }_{{\rm{c}}{\rm{o}}{\rm{s}}\omega } $ ; (c) comparison between some periods of noise and control function. The number of noise cycles in the upper figure is 1.5. sin-type of noise accumulates a maximum phase, while the cos-type of noise completely cancels out itself. The number of noise cycles in the bottom figure is 3, and both types of noise completely cancel out themselves. -
[1] Clerk A A, Devoret M H, Girvin S M, Marquardt F, Schoelkopf R J 2010 Rev. Mod. Phys. 82 1155Google Scholar
[2] Hahn E L 1950 Phys. Rev. 80 580Google Scholar
[3] Slichter C P 1990 Principles of Nuclear Magnetic Resonance (3rd Ed.) (NewYork: Springer) pp1–7
[4] Viola L, Lloyd S 1998 Phys. Rev. A 58 2733Google Scholar
[5] Carr H Y, Purcell E M 1954 Phys. Rev. 94 630Google Scholar
[6] Meiboom S, Gill D 1958 Rev. Sci. Instrum. 29 688Google Scholar
[7] Grégoire I 2005 Ph. D. Dissertation (Paris: Université Pierre et Marie Curie - Paris VI)
[8] Khodjasteh K, Lidar D A 2005 Phys. Rev. Lett. 95 180501Google Scholar
[9] Khodjasteh K, Lidar D A 2007 Phys. Rev. A 75 062310Google Scholar
[10] Uhrig G S 2007 Phys. Rev. Lett. 98 100504Google Scholar
[11] Uhrig G S 2009 Phys. Rev. Lett. 102 120502Google Scholar
[12] Uhrig G S 2008 New J. Phys. 10 083024Google Scholar
[13] Uhrig G S, Pasini S 2010 New J. Phys. 12 045001Google Scholar
[14] Bylander J, Gustavsson S, Yan F, Yoshihara F, Harrabi K, Fitch G, Oliver W D 2011 Nat. Phys. 7 565Google Scholar
[15] Gustavsson S, Bylander J, Yan F, Forn-Díaz P, Bolkhovsky V, Braje D, Oliver W D 2012 Phys, Rev. Lett. 108 170503Google Scholar
[16] Qiu J, Zhou Y, Hu C K, Yuan J, Zhang L, Chu J, Huang W, Liu W, Luo K, Ni Z, Pan X, Yu D 2021 Phys. Rev. A 16 054047Google Scholar
[17] Google 2023 Nature 614 676Google Scholar
[18] Gottesman D 1999 Chaos Solitons Fractals 10 1749Google Scholar
[19] Grassl M, Rötteler M, Beth T 2003 Inter. J. Foundat. Compu. Sci. 14 757Google Scholar
[20] Bullock S S, OLeary D P, Brennen G K 2005 Phys. Rev. Lett. 94 230502Google Scholar
[21] Campbell E T, Anwar H, Browne D E 2012 Phys. Rev. X 2 041021Google Scholar
[22] Campbell E T 2014 Phys. Rev. Lett. 113 230501Google Scholar
[23] Anwar H, Brown B J, Campbell E T, Browne D E 2014 New J. Phys. 16 063038Google Scholar
[24] Krishna A, Tillich J P 2019 Phys. Rev. Lett. 123 070507Google Scholar
[25] Chu J, He X, Zhou Y, Yuan J, Zhang L, Guo Q, Hai Y, Han Z, Hu C K, Huang W, Jia H, Yu D 2023 Nat. Phys. 19 126Google Scholar
[26] Luo K, Huang W, Tao Z, Zhang L, Zhou Y, Chu J, Liu W, Wang B, Cui J, Liu S, Yan F, Yu D 2023 Phys. Rev. Lett. 130 030603Google Scholar
[27] Blok M S, Ramasesh V V, Schuster T, O’Brien K, Kreikebaum J M, Dahlen D, Morvan A, Yoshida B, Yao N Y, Siddiqi I 2021 Phys. Rev. X 11 021010Google Scholar
[28] Suslov M V, Lesovik G B, Blatter G 2011 Phys. Rev. A 83 052317Google Scholar
[29] Bouchard F, Fickler R, Boyd R W, Karimi E 2017 Sci. Adv. 3 e1601915Google Scholar
[30] Napolitano R J, Fanchini F F, da Silva A H, Bellomo B 2021 Phys. Rev. Research 3 013235Google Scholar
[31] Mukhtar M, Saw T B, Soh W T, Gong J 2010 Phys. Rev. A 81 012331Google Scholar
[32] Koch J, Terri M Y, Gambetta J, Houck A A, Schuster D I, Majer J, Blais A, Devoret M H, Girvin S M, Schoelkopf R J 2007 Phys, Rev. A 76 042319Google Scholar
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