Publications

Publications after Joining NTT Basic Research Laboratories

2025

Research highlight

In this work, we develop a theory for equilibration of non-interacting photons in waveguide arrays via chaotic dynamics [Phys. Rev. B 109, 014306 (2024)].

One of the more important results of this work is that we demonstrate that out-of-time-order correlators (OTOCs) are equivalent to the permanent. Thus, for the first time in the literature, it has been shown that the hardness of boson sampling also relates to information scrambling and chaos.
This result opens a new direction of research in the field.

1. "Equilibration of noninteracting photons and quantum signatures of chaos" V. M. Bastidas, H. L. Nourse, A. Sakurai, A. Hayashi, S. Nishio, Kae Nemoto, W. J. Munro Phys. Rev. B 112, 134304 (2025) [ arXiv:2307.13200(2023)].
2. "Emergent symmetries and phases in quantum spin chains coupled to a Kuramoto model"V. M. Bastidas Phys. Research 7, 043029 (2025) [ arXiv:2406.17062 (2024)].
3. "Unification of finite symmetries in the simulation of many-body systems on quantum computers "V. M Bastidas, N. Fitzpatrick, K. J. Joven, Z. M Rossi, S. Islam, T. V. Voorhis, I. L. Chuang, Y. Liu Phys. Rev. A. 111, 052433 (2025) [ arXiv:2309.02622v2 (2023)].

2024

Research highlight

In this work, we use techniques of statistical physics to define QSP sequences for the Ising model [Phys. Rev. B 109, 014306 (2024)].

The main idea of this paper is to use symmetries of statistical physics to formulate an algebraic theory of QSP sequences for the Ising model. We use techniques such as fermionization and dualities to define QSP sequences.
This result allows to design dispersion relations for spin excitations in the Ising model using QSP techniques, which is a unique approach in the field.

4. "Spin amplification in realistic systems "I. Iakoupov, V. M. Bastidas, Y. Matsuzaki, S. Saito, W. J. Munro [ arXiv:2409.11956 (2024)].
5. "Out-of-time-order correlators in electronic structure using Quantum Computers"K. J. Joven and V. M. Bastidas [ arXiv:2405.12289 (2024)].
6. "Complexification of Quantum Signal Processing and its Ramifications"V. M. Bastidas and K. J. Joven [ arXiv:2407.04780 (2024)].
7. "Photon-resolved Floquet theory. II. Open quantum systems" G. Engelhardt, J. Y. Luo, V. M. Bastidas, G. Platero Phys. Rev. A 110, 063708 (2024) [ arXiv:2407.17732 (2024)].
8. "Photon-resolved Floquet theory. I. Full counting statistics of the driving field in Floquet systems "G. Engelhardt, J. Y. Luo, V. M. Bastidas, G. Platero Phys. Rev. A 110, 063707 (2024) [ arXiv:2407.17732 (2024)].
9. "Coherent response of inhomogeneously broadened and spatially localized emitter ensembles in waveguide QED "L. Ruks, X. Xu, R. Ohta, W. J. Munro, and V. M. Bastidas Phys. Rev. B. 109, 014306 (2024) [ arXiv:2309.02622v2 (2023)].
10. "Quantum signal processing with the one-dimensional quantum Ising model", Z. M. Rossi, V. M. Bastidas, W. J. Munro, I. L. Chuang, Phys. Rev. B. 109, 014306 (2024) [ arXiv:2309.04538 (2023)].

2023

Research highlight

This is a geometrical representation of QSP sequence for the group SU(1,1). [arXiv:2304.14383 (2023)].

The main idea of this paper is to extend QSP theorem to the group SU(1,1). Such a group does not have a finite dimensional unitary representation. The only unitary representations are infinite dimensional and given in terms of continuous variables.
This is a powerful result that allows to develop QSP sequence in terms of Gaussian operations.

11. "Quantum signal processing with continuous variables", Z. M. Rossi, V. M. Bastidas, W. J. Munro, I. L. Chuang, [arXiv:2304.14383 (2023)].

2022

Research highlight

This is a scheme of the mechanism to perform topological pumping in networks of coupled spin chains. [ arXiv:2205.00145 (2022)].

The main idea of this paper is to transport particles along a network by exploiting topology. The transport is robust agains imperfections as long as they preserve the symmetry of the Hamiltonian. This proposal can be implemented in quantum simulators such as superconducting qubit arrays by adiabatically changing the onsite angular frequencies of a superconducting quantum chip.
This result is intimately related to the integer quantum Hall effect and this is indeed the origin of the topologically-protected transport. This theoretical proposal can be extended to networks with arbitrary topology and allows to transport superpositions of excitations in a given network. I envision potential applications of this result to quantum information processing and quantum computation.

12. "Topological Thouless pumping in arrays of coupled spin chains"V. M. Bastidas Phys. Rev. B. 106, L220308 (2022) [ arXiv:2205.00145 (2022)].
13. "Stroboscopic Hamiltonian engineering in the low-frequency regime with a one-dimensional quantum processor", V. M. Bastidas*, T. Haug*, C. Gravel, L.-C.Kwek, W. J. Munro and Kae Nemoto, Phys. Rev. B. 105, 075140 (2022) [arXiv:2009.00823 (2020)].
14. "Fractional resonances and prethermal states in Floquet systems", R. Pena, V. M. Bastidas, F. Torres, W. J. Munro and G. Romero, Phys. Rev. B. 106, 064307 (2022) [ arXiv:2111.06949 (2022)].

2021

Research highlight

This is a layout and architecture of a superconducting quantum processor that we used in our recent work [Science 372, 948 (2021)].

The main idea of this paper is to experimentally simulate quantum walks of interacting particles. In the first part of our work, we measure the velocity of the correlation's propagation, which allows us to compare it with the Lieb-Robinson bound. In the second part, we focus on the interference of interacting particles. Due to the strong interaction, the particles cannot occupy the same site, although they are bosons. Instead, they avoid each other, as fermions do. To perform the experiment, the team at the University of Science and technology of China build a superconducting chip with 62 functional qubits.

15. "Reservoir-assisted energy migration through multiple spin domains", J. Dias, C. W. Waechtler, V. M. Bastidas, K. Nemoto, and W. J. Munro, Phys. Rev. B. 104, L140303 (2021) [ arXiv:2108.12119 (2021)].
16. "Dephasing-induced growth of discrete crystalline order in spin networks", A. Sakurai, V. M. Bastidas, M. P. Estarellas W. J. Munro, and Kae Nemoto, Phys. Rev. B. 104, 054304 (2021) [ arXiv:2106.02765 (2021)].
17. "Chimera Time-Crystalline order in quantum spin networks", A. Sakurai, V. M. Bastidas, W. J. Munro, and Kae Nemoto, Phys. Rev. Lett. 126, 120606 (2021) [arXiv:2103.00104 (2021)].
18. "Quantum walks on a programmable two-dimensional 62-qubit superconducting processor", Ming Gong, Shiyu Wang, Chen Zha, Ming-Cheng Chen, He-Liang Huang, Yulin Wu, Qingling Zhu, Youwei Zhao, Shaowei Li, Shaojun Guo, Haoran Qian, Yangsen Ye, Fusheng Chen, Chong Ying, Jiale Yu, Daojin Fan, Dachao Wu, Hong Su, Hui Deng, Hao Rong, Kaili Zhang, Sirui Cao, Jin Lin, Yu Xu, Lihua Sun, Cheng Guo, Na Li, Futian Liang, V. M. Bastidas, Kae Nemoto, W. J. Munro, Yong-Heng Huo, Chao-Yang Lu, Cheng-Zhi Peng, Xiaobo Zhu, Jian-Wei Pan, Science 372, 948 (2021) [arXiv:2102.02573 (2021)].
19. "Rare-earth-mediated opto-mechanical system in the reversed dissipation regime", R. Ohta, L. Herpin, V. M. Bastidas, T. Tawara, H. Yamaguchi, and H. Okamoto, Phys. Rev. Lett. 126, 047404 (2021) [arXiv:2006.14133 (2020)].

2020

Research highlight

In our recent work, we propose how to use time crystals as quantum simulator of complex quantum networks. This is one of the first proposals towards a practical application of this novel state of matter [Science Advances 6, eaay8892 (2020)].

A discrete time crystal (DTC) breaks the discrete translational invariance in time. They appear in systems of interacting particles that are affected by an external drive. However, when there is an error in the drive, the subharmonic response of the system can be lost and the DTC melts. In our work, we use tools of graph theory to identify the relevant resonances between different configurations in the Hilbert space. This allows us to define a graph with exponentially many nodes. During the melting of a DTC, the aforementioned graph exhibit a nontrivial structure known as a scale free network.

20. "Quantum metamorphism", V. M. Bastidas*, M. P. Estarellas*, T. Osada, Kae Nemoto, and W. J. Munro, Phys. Rev. B 102, 224307 (2020) [ arXiv:2011.02113 (2020)].

    * These authors contributed equally to this work

    Our paper was selected as editor's suggestion in Physical Review B

21. "Simulating complex quantum networks with time crystals", M. P. Estarellas*, T. Osada*, V. M. Bastidas*, B. Renoust, K. Sanaka, W. J. Munro and Kae Nemoto, Science Advances 6, eaay8892 (2020) [ arXiv:2011.02113 (2020)].

    * These authors contributed equally to this work

22. "Ergodic-localized junctions in a periodically-driven spin chain ", Chen Zha*, V. M. Bastidas*, Ming Gong*, Yulin Wu, Hao Rong, Rui Yang, Yangsen Ye, Shaowei Li, Qingling Zhu, Shiyu Wang, Youwei Zhao, Futian Liang, Jin Lin, Yu Xu, Cheng-Zhi Peng, Jorg Schmiedmayer, Kae Nemoto, Hui Deng, W. J. Munro, Xiaobo Zhu, Jian-Wei Pan, Phys. Rev. Lett. 125, 170503 (2020) [ arXiv:2011.02113 (2020)].

    * These authors contributed equally to this work

23. "Dissipative nonequilibrium synchronization of topological edge states via self-oscillation", C. W. Waechtler, V. M. Bastidas, G. Schaller, and W. J. Munro, Phys. Rev. B 102, 014309 (2020) [arXiv:2005.07204 (2020)].
24. "One-way transfer of quantum states via decoherence", Y. Matsuzaki, V. M. Bastidas, Y. Takeuchi, W. J. Munro, and S. Saito, J. Phys. Soc. Jpn. 89, 044003 (2020) [arXiv:1810.02995] .
25. "Topological Pumping of Quantum Correlations", T. Haug, L. Amico, L.-C. Kwek, W. J. Munro and V. M. Bastidas, Phys. Rev. Research 2, 013135 (2020) [arXiv:1905.03807].
26. "Dynamical quantum phase transitions and non-Markovian dynamics", T. H. Kyaw, V. M. Bastidas, J. Tangpanitanon, G. Romero, L.-C. Kwek, Phys. Rev. A 101, 012111 (2020) [arXiv:1811.04621].

2019

Research highlight

This figure depicts the main idea of our recent work, where use the scattering matrix approach to unveil signatures of localization of interacting photons [Phys. Rev. A 99, 033835 (2019)].

Scattering has been one of our main tools to uncover the nature of matter. Very early on the experiments of Rutherford show the potential of this technique to probe the structure of matter at small scales. The usual setup in an scattering experiment is composed by an incoming beam that interacts with a target. By looking at the scattered particles, one can reconstruct the scattering cross section, which reveals the character of the target. In our work, we use methods of scattering theory to probe phases of interacting photons. Instead of having a beam of many particles, we consider the scattering of few photon states. In our case, the target is a one dimensional array of interacting photons under the effect of disorder. The interplay between disorder and interactions leads to a transition between the ergodic and localized phase. In our work, we show that this phase transition can be probed in scattering experiments with few photons.

27. "Hidden Order in Quantum Manybody Dynamics of Driven-Dissipative Nonlinear Photonic Lattices", Jirawat Tangpanitanon, Stephen R. Clark, V. M. Bastidas, Rosario Fazio, Dieter Jaksch and Dimitris G. Angelakis, Phys. Rev. A 99, 043808 (2019) [arXiv:1806.10762 ].

    * These authors contributed equally to this work

28. "Strongly correlated photon transport in nonlinear photonic lattices with disorder: Probing signatures of the localization transition", Tian Feng See, V. M. Bastidas, Jirawat Tangpanitanon, and Dimitris G. Angelakis, Phys. Rev. A 99, 033835 (2019) [arXiv:1807.07882].

    * These authors contributed equally to this work

2018

Research highlight

This figure depicts the main idea of our recent work, where use methods of graph theory to describe the proximity effect in an ergodic-localized junction [Phys. Rev. B 98, 224307 (2018)].

Regular dynamics is an exceptional phenomenon in nature. In classical physics, regular motion is very fragile and perturbations can bring the system into a chaotic state. Chaos is associated to the nonlinear character of the equations of motion and its dimensionality. In quantum systems, the equation of motion is linear and there is no notion of phase space. In our work, we investigate the robustness of a localized region, which resembles regular motion when the system is coupled to an ergodic domain acting as a perturbation. The system we consider is a one dimensional array of interacting bosons, which could be experimentally realized in cold atoms or in superconducting chip. In order to have ergodic behavior, we apply a periodic drive to a region of the system. Contrary to this, to have a localized domain, we apply disorder to the onsite energies in another region of the array. By coupling these two regions, we can explore the stability of the localized domain. To do this, we use tools of graph theory to represent the resonances of the multiple system's configurations. The connectivity of the graph reveals that there is a proximity effect and localization is destroyed.

29. "Ergodic-localized junctions in periodically-driven systems", V. M. Bastidas, B. Renoust, Kae Nemoto, and W. J. Munro, Phys. Rev. B 98, 224307 (2018) [arXiv:1807.00080].
30. "Floquet Stroboscopic divisibility in non-Markovian dynamics", V. M. Bastidas, T. H. Kyaw, J. Tangpanitanon, G. Romero, L.-Chuan Kwek, and D. G. Angelakis, New J. Phys. 20, 093004 (2018) [arXiv:1707.04423].

Publications during my postdoctoral fellowship at the National University of Singapore

2017



This figure depicts the Hofstadter butterfly obtained by using an array of 9 superconducting chips. [Science 358, 1175 (2017)].

31. "Spectroscopic signatures of localization with interacting photons in superconducting qubits", P. Roushan*, C. Neill*, J. Tangpanitanon*, V. M. Bastidas*, A. Megrant, R. Barends, Y. Chen, Z. Chen, B. Chiaro, A. Dunsworth, A. Fowler, B. Foxen, M. Giustina, E. Jeffrey, J. Kelly, E. Lucero, J. Mutus, M. Neeley, C. Quintana, D. Sank, A. Vainsencher, J. Wenner, T. White, H. Neven, D. G. Angelakis and J. Martinis, Science 358, 1175 (2017) [arXiv:1709.07108].

    * These authors contributed equally to this work

2016



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

32. "Chimera States in Quantum Mechanics", V. M. Bastidas, I. Omelchenko, A. Zakharova, E. Schoell, and T. Brandes, "Control of Self-Organizing Nonlinear Systems" (conference proceedings, Springer-Verlag), (2016).
33. "Semiclassical excited-state signatures of quantum phase transitions in spin chains with variable-range interactions", M. Gessner, V. M. Bastidas, A. Buchleitner, and T. Brandes, Phys. Rev. B 93, 155153 (2016) [arXiv:1509.08429] .
34. "Semiclassical bifurcations and topological phase transitions in a one-dimensional lattice of coupled Lipkin-Meshkov-Glick models", A. Sorokin, M. Aparicio Alcalde, V. M. Bastidas, G. Engelhardt, D. Angelakis, and T. Brandes, Phys. Rev. E 94, 155153 (2016) [arXiv:1604.08023].
35. "Driven Open Quantum Systems and Stroboscopic Dynamics", S. Restrepo, J. Cerrillo, V. M. Bastidas, D. Angelakis, and T. Brandes, Phys. Rev. Lett 117, 250401 (2016) [arXiv:1606.08392].
36. "Topological Pumping of photons in nonlinear resonator arrays", J. Tangpanitanon, V. M. Bastidas, S. Al-Assam, P. Roushan, D. Jaksch, and D. G. Angelakis, Phys. Rev. Lett 117, 213603 (2016) [arXiv:1607.04050].

Publications during my postdoctoral fellowship and PhD studies at the Technical University of Berlin

2015



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

37. "Excited-state quantum phase transitions and periodic dynamics", G. Engelhardt, V. M. Bastidas, W. Kopylov, and T. Brandes, Phys. Rev. A 91, 013631 (2015) [arXiv:1405.3514v1]
38. "Quantum Signatures of Chimera states", V. M. Bastidas, I. Omelchenko, A. Zakharova, E. Schoell, and T. Brandes, Phys. Rev. E 92, 062924 (2015) [arXiv:1505.02639]

2014



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

39. "Critical quasienergy states in driven many-body systems", V. M. Bastidas, G. Engelhardt, P. Perez-Fernandez, M. Vogl, and T. Brandes, Phys. Rev. A 90, 063628 (2014) [arXiv:1410.5281]
40. "Floquet engineering of long-range p-wave superconductivity", M. Benito, A. Gomez-Leon, V. M. Bastidas, T. Brandes, and G. Platero, Phys. Rev. B 90, 205127 (2014) [arXiv:1409.0546]
41. "Quantum phase transitions in networks of Lipkin-Meshkov-Glick models", A. V. Sorokin, V. M. Bastidas, and T. Brandes, Phys. Rev. E 90, 042141 (2014) [arXiv:1407.2530v1].
42. "Quantum Criticality and Dynamical Instability in the Kicked-Top Model", V. M. Bastidas, P. Perez-Fernandez, M. Vogl, and T. Brandes, Phys. Rev. Lett. 112, 140408 (2014). [ arXiv:1308.5640].

2013



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

43. "Floquet Topological Quantum Phase Transitions in the transverse Wen-Plaquette model", V. M. Bastidas, C. Emary, G. Schaller, A. Gomez-Leon, G. Platero, and T. Brandes, arXiv:1302.0781v2 (2013)
44. "ac-driven quantum phase transition in the Lipkin-Meshkov-Glick model", G. Engelhardt, V. M. Bastidas, C. Emary, and T. Brandes, Phys. Rev. E 87, 052110 (2013) [arXiv:1211.2683]

2012



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

45. "Nonequilibrium Quantum Phase Transitions in the Dicke Model", V. M. Bastidas, C. Emary, B. Regler, and T. Brandes, Phys. Rev. Lett 108, 043003 (2012) [ arXiv:1108.2987].
46. "Nonequilibrium quantum phase transitions in the Ising model", V. M. Bastidas, C. Emary, G. Schaller, and T. Brandes, Phys. Rev. A 86, 063627 (2012) [arXiv:1207.5242]

2010



This figure depicts our scheme to transport groups of interacting photons in superconducting arrays [Phys. Rev. Lett 117, 213603 (2016)].

47. "Entanglement and parametric resonance in driven quantum systems", V. M. Bastidas, J. H. Reina, C. Emary, and T. Brandes, Phys. Rev. A 81, 012316 (2010) [arXiv:0910.1600]

2009

48. "Nonequilibrium entanglement in a driven many-body spin-boson model", V. M. Bastidas, J. H. Reina, and T. Brandes, Phys.: Conf. Ser, 167, 012063 (2009) [arXiv:0904.2411]
49. "Solucion exacta para el modelo de Dicke controlado opticamente", V. M. Bastidas y J. H. Reina, Revista Colombiana de Fisica, 41, 648 (2009)
50. "Intrincamiento en el modelo de Dicke en el regimen de no equilibrio", V. M. Bastidas y J. H. Reina, Revista Colombiana de Fisica, 41, 606 (2009)

Press releases

Our recent press releases about my work after joining NTT Basic Research Labs includes:

• NTT press release about our recent work in collaboration with the nano mechanics group at NTT [Phys. Rev. Lett. 126, 047404 (2021)]: "The world's first realization of an optomechanical device with extremely low optical energy loss - Progress toward the creation of smaller and more efficient optical amplification devices".


• NTT press release about our recent work in collaboration with the National Institute of Informatics [Science Advances 6, eaay8892 (2020)]: "Simulating complex quantum networks with time crystals".


• In the press release of the National Institute of Informatics [Science Advances 6, eaay8892 (2020)]: "Simulating complex quantum networks with time crystals".


• In the press release of Centre national de la recherche scientifique (CNRS) [Science Advances 6, eaay8892 (2020)]: "La fonte des cristaux de temps visualisée au Japanese-French Laboratory for Informatics (JFLI)"..


• In the press release in Eureka Alert [Science Advances 6, eaay8892 (2020)]: "Time crystals lead researchers to future computational work"..

Our recent press releases about my work before joining at NTT Basic Research Labs includes:

• Our article [Science 358, 1175 (2017)] was highlighted in the website of Centre for Quantum Technologies: "CQT researchers collaborate in quantum simulations on Google's superconducting chip"..


• In the press releases of the University of Santa Barbara California (USBC) [Science 358, 1175 (2017)]: "Simulating Physics" .


• In Eureka Alert [Science 358, 1175 (2017)]: "Butterfly emerges from quantum simulation"


• Our article [Phys. Rev. Lett 117, 213603 (2016)] was highlighted in the website of Centre for Quantum Technologies: "Topological scheme for transporting quantum particles inspired by Nobel winner's work"..


• In Eureka Alert [Phys. Rev. Lett 117, 213603 (2016)]: "An Archimedes' screw for groups of quantum particles"


• Our article [Phys. Rev. Lett 117, 250401 (2016)] was highlighted in the website of Centre for Quantum Technologies: "Shaking Schroedinger cat may protect it from the environment"..

Shaking Schroedinger cat may protect it from the environment

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