An initialization strategy for addressing barren plateaus in parametrized quantum circuits

Edward Grant1, Leonard Wossnig1, Mateusz Ostaszewski2, and Marcello Benedetti3

1Rahko Limited & Department of Computer Science, University College London
2Institute of Theoretical and Applied Informatics, Polish Academy of Sciences
3Cambridge Quantum Computing Limited & Department of Computer Science, University College London

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Abstract

Parametrized quantum circuits initialized with random initial parameter values are characterized by barren plateaus where the gradient becomes exponentially small in the number of qubits. In this technical note we theoretically motivate and empirically validate an initialization strategy which can resolve the barren plateau problem for practical applications. The technique involves randomly selecting some of the initial parameter values, then choosing the remaining values so that the circuit is a sequence of shallow blocks that each evaluates to the identity. This initialization limits the effective depth of the circuits used to calculate the first parameter update so that they cannot be stuck in a barren plateau at the start of training. In turn, this makes some of the most compact ansätze usable in practice, which was not possible before even for rather basic problems. We show empirically that variational quantum eigensolvers and quantum neural networks initialized using this strategy can be trained using a gradient based method.

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[268] Alba Cervera-Lierta, Jakob S. Kottmann, and Alán Aspuru-Guzik, "Meta-Variational Quantum Eigensolver: Learning Energy Profiles of Parameterized Hamiltonians for Quantum Simulation", PRX Quantum 2 2, 020329 (2021).

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[276] Alberto Di Meglio, Karl Jansen, Ivano Tavernelli, Constantia Alexandrou, Srinivasan Arunachalam, Christian W. Bauer, Kerstin Borras, Stefano Carrazza, Arianna Crippa, Vincent Croft, Roland de Putter, Andrea Delgado, Vedran Dunjko, Daniel J. Egger, Elias Fernández-Combarro, Elina Fuchs, Lena Funcke, Daniel González-Cuadra, Michele Grossi, Jad C. Halimeh, Zoë Holmes, Stefan Kühn, Denis Lacroix, Randy Lewis, Donatella Lucchesi, Miriam Lucio Martinez, Federico Meloni, Antonio Mezzacapo, Simone Montangero, Lento Nagano, Vincent R. Pascuzzi, Voica Radescu, Enrique Rico Ortega, Alessandro Roggero, Julian Schuhmacher, Joao Seixas, Pietro Silvi, Panagiotis Spentzouris, Francesco Tacchino, Kristan Temme, Koji Terashi, Jordi Tura, Cenk Tüysüz, Sofia Vallecorsa, Uwe-Jens Wiese, Shinjae Yoo, and Jinglei Zhang, "Quantum Computing for High-Energy Physics: State of the Art and Challenges", PRX Quantum 5 3, 037001 (2024).

[277] Alona Sakhnenko, Corey O’Meara, Kumar J. B. Ghosh, Christian B. Mendl, Giorgio Cortiana, and Juan Bernabé-Moreno, "Hybrid classical-quantum autoencoder for anomaly detection", Quantum Machine Intelligence 4 2, 27 (2022).

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[282] Norihito Shirai, Kenji Kubo, Kosuke Mitarai, and Keisuke Fujii, "Quantum tangent kernel", Physical Review Research 6 3, 033179 (2024).

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[285] Josephine Hunout, Sylvain Laizet, and Lorenzo Iannucci, "Variational quantum algorithm based on Lagrange polynomial encoding to solve differential equations ", Physical Review A 111 6, 062404 (2025).

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[288] Stefan H. Sack, Raimel A. Medina, Alexios A. Michailidis, Richard Kueng, and Maksym Serbyn, "Avoiding Barren Plateaus Using Classical Shadows", PRX Quantum 3 2, 020365 (2022).

[289] Jack Cunningham and Jun Zhuang, "Investigating and mitigating barren plateaus in variational quantum circuits: a survey", Quantum Information Processing 24 2, 48 (2025).

[290] Manpreet Singh Jattana, Fengping Jin, Hans De Raedt, and Kristel Michielsen, "Improved Variational Quantum Eigensolver Via Quasidynamical Evolution", Physical Review Applied 19 2, 024047 (2023).

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[293] Yuhan Yao and Yoshihiko Hasegawa, "Avoiding barren plateaus with entanglement", Physical Review A 111 2, 022426 (2025).

[294] Kaining Zhang, Min-Hsiu Hsieh, and Dacheng Tao, "Deep Variational Quantum Circuits with Barren-Plateau-Free Architectures", Artificial Intelligence Science and Engineering 2 1, 66 (2026).

[295] Lucas Friedrich and Jonas Maziero, "Restricting to the chip architecture maintains the quantum neural network accuracy", Quantum Information Processing 23 4, 131 (2024).

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[298] Cenk Tüysüz, Su Yeon Chang, Maria Demidik, Karl Jansen, Sofia Vallecorsa, and Michele Grossi, "Symmetry Breaking in Geometric Quantum Machine Learning in the Presence of Noise", PRX Quantum 5 3, 030314 (2024).

[299] Abhinav Anand and Kenneth R. Brown, "Hamiltonian-based graph-state ansatz for variational quantum algorithms", Physical Review A 111 1, 012437 (2025).

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[301] Joonho Kim, Jaedeok Kim, and Dario Rosa, "Universal effectiveness of high-depth circuits in variational eigenproblems", Physical Review Research 3 2, 023203 (2021).

[302] Marcello Benedetti, Erika Lloyd, Stefan Sack, and Mattia Fiorentini, "Parameterized quantum circuits as machine learning models", Quantum Science and Technology 4 4, 043001 (2019).

[303] Zhihai Xie, Shibin Zhang, and Mian Ren, "Depth-dependent separability growth in variational quantum neural networks and its empirical coupling to a parameter-sensitivity statistic", Physica Scripta 101 29, 296003 (2026).

[304] Liam Madden, Albert Akhriev, and Andrea Simonetto, 2022 IEEE International Conference on Quantum Computing and Engineering (QCE) 492 (2022) ISBN:978-1-6654-9113-6.

[305] Carlos Bravo-Prieto, Ryan LaRose, M. Cerezo, Yigit Subasi, Lukasz Cincio, and Patrick J. Coles, "Variational Quantum Linear Solver", Quantum 7, 1188 (2023).

[306] Giovanni Pecci, Ruiyi Wang, Pietro Torta, Glen Bigan Mbeng, and Giuseppe Santoro, "Beyond quantum annealing: optimal control solutions to maxcut problems", Quantum Science and Technology 9 4, 045013 (2024).

[307] G. Paradezhenko, A. Pervishko, and D. Yudin, "Quantum-Assisted Open-Pit Optimization", JETP Letters 119 6, 470 (2024).

[308] Yong-Xin Yao, Niladri Gomes, Feng Zhang, Cai-Zhuang Wang, Kai-Ming Ho, Thomas Iadecola, and Peter P. Orth, "Adaptive Variational Quantum Dynamics Simulations", PRX Quantum 2 3, 030307 (2021).

[309] Niladri Gomes, Anirban Mukherjee, Feng Zhang, Thomas Iadecola, Cai‐Zhuang Wang, Kai‐Ming Ho, Peter P. Orth, and Yong‐Xin Yao, "Adaptive Variational Quantum Imaginary Time Evolution Approach for Ground State Preparation", Advanced Quantum Technologies 4 12, 2100114 (2021).

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[312] Xianzhi Huang, Lili Niu, Jie Chen, Lichao Li, Kashif Hayat, and Weiping Liu, "Quantum and classical computational synergy for emerging contaminants management: Advanced insights into cytochrome P450 metabolic mechanisms", Critical Reviews in Environmental Science and Technology 54 24, 1827 (2024).

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[314] Chayan Patra and Rahul Maitra, "Energy landscape plummeting in variational quantum eigensolver: Subspace optimization, non-iterative corrections, and generator-informed initialization for improved quantum efficiency", The Journal of Chemical Physics 163 2, 024112 (2025).

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[316] Juan E. Ardila-García, Vladimir Vargas-Calderón, Fabio A. González, Diego H. Useche, and Herbert Vinck-Posada, "MEMO-QCD: quantum density estimation through memetic optimisation for quantum circuit design", Quantum Machine Intelligence 7 1, 3 (2025).

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[318] Ryo Watanabe, Keisuke Fujii, and Hiroshi Ueda, "Variational quantum eigensolver with embedded entanglement using a tensor-network ansatz", Physical Review Research 6 2, 023009 (2024).

[319] Alejandro Sopena, Max Hunter Gordon, Diego García-Martín, Germán Sierra, and Esperanza López, "Algebraic Bethe Circuits", Quantum 6, 796 (2022).

[320] Nancy Louise and V. Kavitha, 2026 4th International Conference on Artificial Intelligence and Machine Learning Applications Theme: Healthcare and Internet of Things (AIMLA) 1 (2026) ISBN:979-8-3195-0634-4.

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[322] David A. Herrera-Martí, "Policy Gradient Approach to Compilation of Variational Quantum Circuits", Quantum 6, 797 (2022).

[323] Federico Raffaele De Filippi, Antonio Francesco Mello, Daniel Sacco Shaikh, Maura Sassetti, Niccolò Traverso Ziani, and Michele Grossi, "Few-Body Precursors of Topological Frustration", Symmetry 16 8, 1078 (2024).

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[325] Barnaby van Straaten and Bálint Koczor, "Measurement Cost of Metric-Aware Variational Quantum Algorithms", PRX Quantum 2 3, 030324 (2021).

[326] Mafalda Ramôa, Panagiotis G. Anastasiou, Luis Paulo Santos, Nicholas J. Mayhall, Edwin Barnes, and Sophia E. Economou, "Reducing the resources required by ADAPT-VQE using coupled exchange operators and improved subroutines", npj Quantum Information 11 1, 86 (2025).

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[353] Samuel Yen-Chi Chen, "Quantum Artificial Intelligence: From Quantum Neural Networks to Self-Programming Architectures [Feature]", IEEE Circuits and Systems Magazine 26 1, 41 (2026).

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[360] Jinkai Tian, Xiaoyu Sun, Yuxuan Du, Shanshan Zhao, Qing Liu, Kaining Zhang, Wei Yi, Wanrong Huang, Chaoyue Wang, Xingyao Wu, Min-Hsiu Hsieh, Tongliang Liu, Wenjing Yang, and Dacheng Tao, "Recent Advances for Quantum Neural Networks in Generative Learning", IEEE Transactions on Pattern Analysis and Machine Intelligence 45 10, 12321 (2023).

[361] Yijie Zhu, Vaneet Aggarwal, Debanjan Konar, Yuri Pashkin, Plamen Angelov, and Richard Jiang, "Toward Quantum Image Generation on Single Qubit Using Quantum Information Bottleneck", IEEE Transactions on Artificial Intelligence 7 4, 2321 (2026).

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[364] Sabrina Herbst, Vincenzo De Maio, and Ivona Brandic, 2024 IEEE International Conference on Quantum Computing and Engineering (QCE) 1478 (2024) ISBN:979-8-3315-4137-8.

[365] Ze‐Tong Li, Fan‐Xu Meng, Han Zeng, Zhai‐Rui Gong, Zai‐Chen Zhang, and Xu‐Tao Yu, "A Gradient‐Cost Multiobjective Alternate Framework for Variational Quantum Eigensolver with Variable Ansatz", Advanced Quantum Technologies 6 5, 2200130 (2023).

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[372] Zidu Liu, Pei-Xin Shen, Weikang Li, L-M Duan, and Dong-Ling Deng, "Quantum capsule networks", Quantum Science and Technology 8 1, 015016 (2023).

[373] Alberto Bottarelli, Mikel Garcia de Andoin, Pranav Chandarana, Koushik Paul, Xi Chen, Mikel Sanz, and Philipp Hauke, "Symmetry-enhanced counterdiabatic quantum algorithm for qudits", Physical Review Research 7 4, 043030 (2025).

[374] Sivarama Prasad Tera, Ravikumar Chinthaginjala, Xin Zhao, and Monia Hamdi, "Advancing quantum machine learning from conceptual design to practical use", Expert Systems with Applications 320, 132127 (2026).

[375] Reza Haghshenas, Johnnie Gray, Andrew C. Potter, and Garnet Kin-Lic Chan, "Variational Power of Quantum Circuit Tensor Networks", Physical Review X 12 1, 011047 (2022).

[376] Randall Correll, Sean J. Weinberg, Fabio Sanches, Takanori Ide, and Takafumi Suzuki, "Quantum Neural Networks for a Supply Chain Logistics Application", Advanced Quantum Technologies 6 7, 2200183 (2023).

[377] David Fitzek, Robert S. Jonsson, Werner Dobrautz, and Christian Schäfer, "Optimizing Variational Quantum Algorithms with qBang: Efficiently Interweaving Metric and Momentum to Navigate Flat Energy Landscapes", Quantum 8, 1313 (2024).

[378] Rasyid Ustman Ramadhan, Luthfiya Kurnia Permatahati, Teguh Budi Prayitno, and Yanoar P. Sarwono, "Expressibility and Trainability Analysis of Hardware-Efficient Ansatz Variants in Variational Quantum Eigensolver with a Linear Mixing Model", The Journal of Physical Chemistry A 130 15, 3101 (2026).

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The above citations are from Crossref's cited-by service (last updated successfully 2026-08-19 09:48:13) and SAO/NASA ADS (last updated successfully 2026-08-18 21:29:42). The list may be incomplete as not all publishers provide suitable and complete citation data.

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