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    "release_date": "2025-08-20T00:00:00",
    "funder": "https://doi.org/10.13039/501100003246",
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    "date": "2026-11-05T00:00:00",
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    {
      "project_id": "680-47-624",
      "title": "Probing and exploiting large-scale quantum states with a multi-node quantum network",
      "funding_scheme_id": 713,
      "funding_scheme": "NWO-Talentprogramma Vici Beta 2015 VI",
      "department": "",
      "sub_department": "NWO-breed",
      "start_date": "2016-08-01T00:00:00",
      "end_date": "2021-07-31T00:00:00",
      "reporting_year": 2016,
      "summary_nl": "Quantum mechanics, our most fundamental theory of nature, dictates that particles can share a common state: they can be entangled. Entanglement is studied intensively in labs around the world, both for its fundamental role in nature as well as for its potential to revolutionize communication and computing. These research efforts have so far focussed either on extending the distance between a few entangled particles, or on extending the number of participating entangled particles.\nI propose to open a new research frontier by connecting many particles into a multi-node quantum network. This network will enable the generation of unprecedented quantum states through teleportation and entanglement purification, and allow for addressing open challenges ranging from foundational questions in quantum physics to applications: How large can a single quantum state be? Can we ensure privacy in communication without knowing the inner workings of the devices we use?\nThis proposal will capitalize on two recent breakthroughs with single electron spins trapped at defects in diamond in my group. First, we have entangled electron spins on different chips (very recently over a distance >1km). Second, we have achieved full control over a handful of nuclear spins near one such electron. With these a true quantum network can be formed from several multi-particle nodes. \nThis work will not only explore new ground in fundamental quantum physics but it may also impact secure communication, metrology (through a future world-wide network of quantum clocks) and distributed quantum simulations and computing, and pave the way towards a global quantum Internet.",
      "summary_en": "Quantum mechanics, our most fundamental theory of nature, dictates that particles can share a common state: they can be entangled. Entanglement is studied intensively in labs around the world, both for its fundamental role in nature as well as for its potential to revolutionize communication and computing. These research efforts have so far focussed either on extending the distance between a few entangled particles, or on extending the number of participating entangled particles.\nI propose to open a new research frontier by connecting many particles into a multi-node quantum network. This network will enable the generation of unprecedented quantum states through teleportation and entanglement purification, and allow for addressing open challenges ranging from foundational questions in quantum physics to applications: How large can a single quantum state be? Can we ensure privacy in communication without knowing the inner workings of the devices we use?\nThis proposal will capitalize on two recent breakthroughs with single electron spins trapped at defects in diamond in my group. First, we have entangled electron spins on different chips (very recently over a distance >1km). Second, we have achieved full control over a handful of nuclear spins near one such electron. With these a true quantum network can be formed from several multi-particle nodes. \nThis work will not only explore new ground in fundamental quantum physics but it may also impact secure communication, metrology (through a future world-wide network of quantum clocks) and distributed quantum simulations and computing, and pave the way towards a global quantum Internet.",
      "grant_id": "https://doi.org/10.61686/JLGJF48307",
      "project_members": [
        {
          "role": "Researcher",
          "member_id": 493197,
          "last_name": "Westerveld",
          "degree_pre_nominal": "dr. ir.",
          "initials": "W.J.",
          "first_name": "Wouter",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false,
          "orcid": "https://orcid.org/0000-0001-5658-2394"
        },
        {
          "role": "Researcher",
          "member_id": 399619,
          "last_name": "Stolk",
          "initials": "A.",
          "first_name": "Arian",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 504911,
          "last_name": "Beukers",
          "initials": "H.K.C.",
          "first_name": "Hans",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 586944,
          "last_name": "Pasini",
          "initials": "M.",
          "first_name": "Matteo",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false,
          "orcid": "https://orcid.org/0009-0005-1358-7896"
        },
        {
          "role": "Researcher",
          "member_id": 399292,
          "last_name": "Weaver",
          "initials": "M.",
          "first_name": "Matthew",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 399290,
          "last_name": "Ruf",
          "initials": "M.",
          "first_name": "Maximilian",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 399291,
          "last_name": "Kalb",
          "initials": "N.",
          "first_name": "Norbert",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Researcher",
          "member_id": 399288,
          "last_name": "Baier",
          "initials": "S.",
          "first_name": "Simon",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
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        {
          "role": "Researcher",
          "member_id": 504912,
          "last_name": "Herrmann",
          "initials": "Y.S.",
          "first_name": "Yanik",
          "organisation": "Technische Universiteit Delft||QuTech",
          "organisation_id": 75741,
          "ror": "https://ror.org/02e2c7k09",
          "active": false
        },
        {
          "role": "Main Applicant",
          "member_id": 169284,
          "last_name": "Hanson",
          "degree_pre_nominal": "prof. dr. ir.",
          "initials": "R.",
          "first_name": "Ronald",
          "organisation": "Technische Universiteit Delft||Faculteit Technische Natuurwetenschappen||NanoScience - Kavli Institute of Nanoscience Delft",
          "organisation_id": 74375,
          "ror": "https://ror.org/02e2c7k09",
          "active": true
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      "products": [
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          "title": "Resonant Excitation and Purcell Enhancement of Coherent Nitrogen-Vacancy Centers Coupled to a Fabry-Pérot Micro-Cavity",
          "year": 2021,
          "edition": "15",
          "start": 1,
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          "title": "Cavity-enhanced quantum network nodes in diamond",
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          "title": "Quantum networks based on color centers in diamond",
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          "title": "Optically coherent nitrogen-vacancy centers in µm-thin etched diamond membranes",
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          "title": "Optimal design of diamond-air microcavities for quantum networks using an analytical approach",
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          "title": "Near-term quantum repeater experiments with NV centers: overcoming the limitations of direct transmission",
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          "title": "Deterministic delivery of remote entanglement on a quantum network",
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        {
          "title": "Dephasing mechanisms of diamond-based nuclear-spin memories for quantum networks",
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          "title": "Diamond-based quantum networks with multi-qubit nodes",
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          "title": "Design and low-temperature characterization of a tunable microcavity for diamond-based quantum networks",
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          "title": "Entanglement between a diamond spin qubit and a photonic time-bin qubit at telecom wavelength",
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        {
          "title": "Multiplexed entanglement generation over quantum networks using multi-qubit nodes",
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        {
          "title": "Quantum internet: A vision for the road ahead",
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        },
        {
          "title": "Witnessing Entanglement in Experiments with Correlated Noise",
          "year": 2020,
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          "url_open_access": "10.1088/2058-9565/ab8d88",
          "journal_title": "Quantum Science and Technology",
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            {
              "last_name": "Hanson",
              "initials": "R",
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            }
          ]
        },
        {
          "title": "Quantum Frequency Conversion of Single Photons from a Nitrogen-Vacancy Center\nin Diamond to Telecommunication Wavelengths",
          "year": 2018,
          "edition": "9",
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          "type": "Wetenschappelijk artikel",
          "url_open_access": "https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.9.064031",
          "journal_title": "Phys. Rev. Applied",
          "authors": [
            {
              "last_name": "Hanson",
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          ]
        }
      ]
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}