{
  "meta": {
    "api_type": "NWO Projects API",
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    "licence": {
      "name": "CC0 1.0 Universal",
      "url": "https://creativecommons.org/publicdomain/zero/1.0",
      "description": "To the extent possible under law, all copyright and related or neighbouring rights have been waived worldwide to the data made available through this API."
    },
    "documentation": "https://doi.org/10.5281/zenodo.14918287",
    "release_date": "2025-08-20T00:00:00",
    "funder": "https://doi.org/10.13039/501100003246",
    "ror_id": "https://ror.org/04jsz6e67",
    "date": "2026-11-05T00:00:00",
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  "projects": [
    {
      "project_id": "680-91-130",
      "title": "Adiabatic protocols in extended quantum systems",
      "funding_scheme_id": 3568,
      "funding_scheme": "Natuurkunde - Projectruimte Continu Indienen 2018-IV",
      "department": "Exacte en Natuurwetenschappen",
      "sub_department": "Exacte en Natuurwetenschappen",
      "start_date": "2019-09-01T00:00:00",
      "end_date": "2024-08-31T00:00:00",
      "reporting_year": 2018,
      "summary_nl": "Quantum adiabatic protocols are routines in which the Hamiltonian of a quantum \n\nsystem undergoes gradual deformation from a given initial to a given final \n\nvalue. Adiabaticity means that the routine is performed slowly enough to ensure \n\ncomplete control, in some well defined sense, over the system's quantum state.\n\nAdiabatic protocols offer a natural framework for coherent quantum state \n\nmanipulation, therefore the last several years have been marked by \n\nincreasing interest in their practical implementation. The existence of an \n\nadiabatically slow regime for every quantum protocol is guaranteed \n\nby the adiabatic theorem established by Born and Fock as early as 1928.\n\nHowever, the practically important question of what specific conditions are needed to \n\nensure adiabaticity of a given protocol remains a hard and \n\nlargely unresolved problem. In 2017 the Applicant co-authored a work, which pioneered \n\nan new approach to adiabaticity conditions based on a relationship \n\nbetween violation of adiabaticity and orthogonality catastrophe in extended \n\nquantum systems. The findings of this work open up a whole new avenue of \n\nresearch linking adiabaticity to simple low-energy characteristics of a\n\nquantum system. This proposal aims to address the outstanding methodological \n\nquestions arising from the new approach, as well as investigating the implications \n\nof the new adiabaticity conditions for the \n\nsystems of immediate practical \n\nimportance.",
      "summary_en": "Quantum adiabatic protocols are routines in which the Hamiltonian of a quantum \n\nsystem undergoes gradual deformation from a given initial to a given final \n\nvalue. Adiabaticity means that the routine is performed slowly enough to ensure \n\ncomplete control, in some well defined sense, over the system's quantum state.\n\nAdiabatic protocols offer a natural framework for coherent quantum state \n\nmanipulation, therefore the last several years have been marked by \n\nincreasing interest in their practical implementation. The existence of an \n\nadiabatically slow regime for every quantum protocol is guaranteed \n\nby the adiabatic theorem established by Born and Fock as early as 1928.\n\nHowever, the practically important question of what specific conditions are needed to \n\nensure adiabaticity of a given protocol remains a hard and \n\nlargely unresolved problem. In 2017 the Applicant co-authored a work, which pioneered \n\nan new approach to adiabaticity conditions based on a relationship \n\nbetween violation of adiabaticity and orthogonality catastrophe in extended \n\nquantum systems. The findings of this work open up a whole new avenue of \n\nresearch linking adiabaticity to simple low-energy characteristics of a\n\nquantum system. This proposal aims to address the outstanding methodological \n\nquestions arising from the new approach, as well as investigating the implications \n\nof the new adiabaticity conditions for the \n\nsystems of immediate practical \n\nimportance.",
      "award_amount": 424831,
      "grant_id": "https://doi.org/10.61686/HKLAZ74007",
      "summary_updates": [
        {
          "submission_date": "2024-12-09T22:08:19",
          "update_en": "This project explored two critical aspects of quantum systems. First, we investigated how quickly quantum algorithms can solve problems while preserving accuracy. We developed a framework to estimate the minimum time required for such processes, helping to reveal the limits of quantum speed for tasks like finding hidden structures in complex networks. Second, we tackled the challenge of controlling quantum systems at high speeds without introducing errors. By optimizing the system’s path through its settings, we showed how perfect accuracy could be achieved even in demanding conditions, paving the way for faster, more reliable quantum computing.",
          "update_nl": "Dit project onderzocht twee belangrijke aspecten van kwantumsystemen. Ten eerste ontwikkelden we een methode om te bepalen hoe snel kwantumalgoritmen problemen kunnen oplossen zonder de nauwkeurigheid te verliezen. Dit hielp om de grenzen van kwantumsnelheid bij het vinden van verborgen structuren in complexe netwerken te verhelderen. Ten tweede optimaliseerden we hoe kwantumsystemen op hoge snelheid kunnen worden bestuurd zonder fouten. Door het pad van het systeem te verfijnen, toonden we aan hoe perfecte nauwkeurigheid zelfs onder uitdagende omstandigheden mogelijk is. Dit maakt de weg vrij voor snellere en betrouwbaardere kwantumcomputers."
        }
      ],
      "project_members": [
        {
          "role": "Researcher",
          "member_id": 516675,
          "last_name": "Chen",
          "degree_pre_nominal": "dr.",
          "initials": "J.H.",
          "first_name": "Jyong-Hao",
          "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Leids Instituut voor Onderzoek in de Natuurkunde (LION)||Interface Physics",
          "organisation_id": 65121,
          "ror": "https://ror.org/027bh9e22",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 416907,
          "last_name": "Malikis",
          "initials": "S.",
          "first_name": "Savvas",
          "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Leids Instituut voor Onderzoek in de Natuurkunde (LION)||Interface Physics",
          "organisation_id": 65121,
          "ror": "https://ror.org/027bh9e22",
          "active": false
        },
        {
          "role": "Main Applicant",
          "member_id": 283629,
          "last_name": "Cheianov",
          "degree_pre_nominal": "dr.",
          "initials": "V.V.",
          "first_name": "Vadim",
          "organisation": "Universiteit Leiden||Instituut Lorentz Center",
          "organisation_id": 55708,
          "ror": "https://ror.org/027bh9e22",
          "active": true
        },
        {
          "role": "Project leader",
          "member_id": 283629,
          "last_name": "Cheianov",
          "degree_pre_nominal": "dr.",
          "initials": "V.V.",
          "first_name": "Vadim",
          "organisation": "Universiteit Leiden||Instituut Lorentz Center",
          "organisation_id": 55708,
          "ror": "https://ror.org/027bh9e22",
          "active": true
        }
      ],
      "products": [
        {
          "title": "Bounds on quantum adiabaticity in driven many-body systems from generalized orthogonality catastrophe and quantum speed limit",
          "year": 2022,
          "edition": "4",
          "start": 43055,
          "end": 43061,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://doi.org/10.1103/PhysRevResearch.4.043055",
          "journal_title": "Physical Review Research",
          "authors": [
            {
              "last_name": "Chen",
              "initials": "J-H",
              "role": "Auteur"
            },
            {
              "last_name": "Cheianov",
              "initials": "V",
              "role": "Auteur"
            }
          ]
        },
        {
          "title": "Quantum adiabaticity in many-body systems and almost-orthogonality in complementary subspace",
          "year": 2023,
          "start": 220802620,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://doi.org/10.48550/arXiv.2208.02620",
          "journal_title": "Cornel University preprint arXiv",
          "authors": [
            {
              "last_name": "Chen",
              "initials": "J-H",
              "role": "Auteur"
            },
            {
              "last_name": "Cheianov",
              "initials": "V",
              "role": "Auteur"
            }
          ]
        },
        {
          "title": "Lower bounds for adiabatic quantum algorithms by quantum speed limits",
          "year": 2023,
          "edition": "5",
          "start": 33175,
          "end": 33184,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://doi.org/10.1103/PhysRevResearch.5.033175",
          "journal_title": "Physical Review Research",
          "authors": [
            {
              "last_name": "Chen",
              "initials": "J-H",
              "role": "Auteur"
            }
          ]
        },
        {
          "title": "Rapid-cycle Thouless pumping in a one-dimensional optical lattice",
          "year": 2021,
          "edition": "104",
          "start": 63315,
          "end": 63324,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://doi.org/10.1103/PhysRevA.104.063315",
          "journal_title": "Physical Review A",
          "authors": [
            {
              "last_name": "Schouten",
              "initials": "K.J.M.",
              "role": "Auteur"
            },
            {
              "last_name": "Cheianov",
              "initials": "V",
              "role": "Auteur"
            }
          ]
        },
        {
          "title": "Integrability and chaos in the quantum brachistochrone problem",
          "year": 2024,
          "edition": "110",
          "start": 22205,
          "end": 22217,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://doi.org/10.1103/PhysRevA.110.022205",
          "journal_title": "Physical Review A",
          "authors": [
            {
              "last_name": "Malikis",
              "initials": "S",
              "role": "Auteur"
            },
            {
              "last_name": "Cheianov",
              "initials": "V",
              "role": "Auteur"
            }
          ]
        },
        {
          "title": "An ideal rapid-cycle Thouless pump",
          "year": 2022,
          "edition": "12",
          "start": 203,
          "end": 222,
          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://www.doi.org/10.21468/SciPostPhys.12.6.203",
          "journal_title": "SciPost Physics",
          "authors": [
            {
              "last_name": "Malikis",
              "initials": "S",
              "role": "Auteur"
            },
            {
              "last_name": "Cheianov",
              "initials": "V",
              "role": "Auteur"
            }
          ]
        }
      ]
    }
  ]
}