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Beukers, H.K.C. (author), Pasini, M. (author), Choi, Hyeongrak (author), Englund, Dirk (author), Hanson, R. (author), Borregaard, J. (author)The generation of entanglement between distant quantum systems is at the core of quantum networking. In recent years, numerous theoretical protocols for remote-entanglement generation have been proposed, many of which have been experimentally realized. Here, we provide a modular theoretical framework to elucidate the general mechanisms of...journal article 2024
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Stolk, A.J. (author), van der Enden, K.L. (author), Röhsner, M. (author), te Raa, I. (author), Hagen, R.A.J. (author), Biemond, J.J.B. (author), Meskers, A.J.H. (author), Morits, J.P.J. (author), van Zwet, E.J. (author), Hanson, R. (author)We show the latest progress towards establishing a solid-state, metropolitan quantum link, consisting of two remote Nitrogen Vacancy (NV)-centers and a central measurement station. The entanglement is generated by converting single emitted photons to the same frequency in the telecom L-band, guiding them to a central beamsplitter, where a joint...conference paper 2023
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Hermans, S.L.N. (author), Pompili, M. (author), Baier, S. (author), Beukers, H.K.C. (author), Humphreys, P.C. (author), Schouten, R.N. (author), Vermeulen, R.F.L. (author), Tiggelman, M.J. (author), Dos Santos Martins, L. (author), Dirkse, B. (author), Borregaard, J. (author), Wehner, S.D.C. (author), Hanson, R. (author)We report on the realization of a multi-node quantum network. Using the network, we have demonstrated three protocols; generation of a entangled state shared by all nodes, entanglement swapping and quantum teleportation between non-neighboring nodes.conference paper 2023
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Li, Y. (author), Gerritsma, F.A. (author), Kurdi, S. (author), Codreanu, N. (author), Groeblacher, S. (author), Hanson, R. (author), Norte, R.A. (author), van der Sar, T. (author)Magnetic imaging with nitrogen-vacancy (NV) spins in diamond is becoming an established tool for studying nanoscale physics in condensed matter systems. However, the optical access required for NV spin readout remains an important hurdle for operation in challenging environments such as millikelvin cryostats or biological systems. Here, we...journal article 2023
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Hermans, S.L.N. (author), Pompili, M. (author), Dos Santos Martins, L. (author), Rodriguez-Pardo Montblanch, A. (author), Beukers, H.K.C. (author), Baier, S. (author), Borregaard, J. (author), Hanson, R. (author)The generation of entanglement between remote matter qubits has developed into a key capability for fundamental investigations as well as for emerging quantum technologies. In the single-photon, protocol entanglement is heralded by generation of qubit-photon entangled states and subsequent detection of a single photon behind a beam splitter....journal article 2023
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Stolk, A.J. (author), van der Enden, K.L. (author), Röhsner, M. (author), Teepe, A. (author), Faes, S. O.F. (author), Bradley, C.E. (author), Cadot, S.P.A. (author), van Rantwijk, J.F. (author), te Raa, I. (author), Hagen, R.A.J. (author), Verlaan, A. L. (author), Biemond, J.J.B. (author), Khorev, A. (author), Vollmer, R. (author), Morits, J.P.J. (author), Taminiau, T.H. (author), van Zwet, E.J. (author), Hanson, R. (author)Entanglement distribution over quantum networks has the promise of realizing fundamentally new technologies. Entanglement between separated quantum processing nodes has been achieved on several experimental platforms in the past decade. To move toward metropolitan-scale quantum network test beds, the creation and transmission of...journal article 2022
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Pompili, M. (author), Delle Donne, C. (author), te Raa, I. (author), van der Vecht, B. (author), Skrzypczyk, M.D. (author), Maciel Ferreira, G. (author), de Kluijver, L. (author), Stolk, A.J. (author), Hermans, S.L.N. (author), Pawełczak, Przemysław (author), Kozlowski, W. (author), Hanson, R. (author), Wehner, S.D.C. (author)Scaling current quantum communication demonstrations to a large-scale quantum network will require not only advancements in quantum hardware capabilities, but also robust control of such devices to bridge the gap in user demand. Moreover, the abstraction of tasks and services offered by the quantum network should enable platform-independent...journal article 2022
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Hermans, S.L.N. (author), Pompili, M. (author), Beukers, H.K.C. (author), Baier, S. (author), Borregaard, J. (author), Hanson, R. (author)Future quantum internet applications will derive their power from the ability to share quantum information across the network<sup>1,2</sup>. Quantum teleportation allows for the reliable transfer of quantum information between distant nodes, even in the presence of highly lossy network connections<sup>3</sup>. Although many experimental...journal article 2022
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Bradley, C.E. (author), de Bone, S.W. (author), Möller, P. F.W. (author), Baier, S. (author), Degen, M.J. (author), Loenen, S.J.H. (author), Bartling, H.P. (author), Hanson, R. (author), Elkouss Coronas, D. (author), Taminiau, T.H. (author)Quantum networks can enable quantum communication and modular quantum computation. A powerful approach is to use multi-qubit nodes that provide quantum memory and computational power. Nuclear spins associated with defects in diamond are promising qubits for this role. However, dephasing during optical entanglement distribution hinders scaling...journal article 2022
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Pompili, M. (author), Hermans, S.L.N. (author), Baier, S. (author), Beukers, H.K.C. (author), Humphreys, P.C. (author), Schouten, R.N. (author), Vermeulen, R.F.L. (author), Tiggelman, M.J. (author), Dos Santos Martins, L. (author), Dirkse, B. (author), Wehner, S.D.C. (author), Hanson, R. (author)The distribution of entangled states across the nodes of a future quantum internet will unlock fundamentally new technologies. Here, we report on the realization of a three-node entanglement-based quantum network. We combine remote quantum nodes based on diamond communication qubits into a scalable phase-stabilized architecture, supplemented...journal article 2021
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van der Sar, T. (author), Taminiau, T.H. (author), Hanson, R. (author)Optically accessible spins associated with defects in diamond provide a versatile platform for quantum science and technology. These spins combine multiple key characteristics, including long quantum coherence times, operation up to room temperature, and the capability to create long-range entanglement links through photons. These unique...journal article 2021
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Ruf, M.T. (author), Wan, Noel H. (author), Choi, Hyeongrak (author), Englund, Dirk (author), Hanson, R. (author)With the ability to transfer and process quantum information, large-scale quantum networks will enable a suite of fundamentally new applications, from quantum communications to distributed sensing, metrology, and computing. This Perspective reviews requirements for quantum network nodes and color centers in diamond as suitable node candidates...review 2021
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Ruf, M.T. (author), Weaver, M.J. (author), van Dam, S.B. (author), Hanson, R. (author)The nitrogen-vacancy (N-V) center in diamond has been established as a prime building block for quantum networks. However, scaling beyond a few network nodes is currently limited by low spin-photon entanglement rates, resulting from the N-V center's low probability of coherent photon emission and collection. Integration into a cavity can...journal article 2021
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Dirkse, B. (author), Pompili, M. (author), Hanson, R. (author), Walter, Michael (author), Wehner, S.D.C. (author)The purpose of an entanglement witness experiment is to certify the creation of an entangled state from a finite number of trials. The statistical confidence of such an experiment is typically expressed as the number of observed standard deviations of witness violations. This method implicitly assumes that the noise is well-behaved so that...journal article 2020
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Baier, S. (author), Bradley, C.E. (author), Middelburg, T. (author), Dobrovitski, V.V. (author), Taminiau, T.H. (author), Hanson, R. (author)The neutral charge state plays an important role in quantum information and sensing applications basedon nitrogen-vacancy centers. However, the orbital and spin dynamics remain unexplored. Here, we useresonant excitation of single centers to directly reveal the fine structure, enabling selective addressing ofspin-orbit states. Through pump-probe...journal article 2020
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van Dam, S.B. (author), Degen, M.J. (author), Bersin, E. (author), Galiullin, A. (author), Ruf, M.T. (author), IJspeert, M. (author), Taminiau, T.H. (author), Hanson, R. (author)The advancement of quantum optical science and technology with solid-state emitters such as nitrogen-vacancy (NV) centers in diamond critically relies on the coherence of the emitters' optical transitions. A widely employed strategy to create NV centers at precisely controlled locations is nitrogen ion implantation followed by a high...journal article 2019
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Rozpedek, F.D. (author), Yehia, R. (author), Goodenough, K.D. (author), Ruf, M.T. (author), Humphreys, P.C. (author), Hanson, R. (author), Wehner, S.D.C. (author), Elkouss Coronas, D. (author)Quantum channels enable the implementation of communication tasks inaccessible to their classical counterparts. The most famous example is the distribution of secret key. However, in the absence of quantum repeaters, the rate at which these tasks can be performed is dictated by the losses in the quantum channel. In practice, channel losses...journal article 2019
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Ruf, M.T. (author), IJspeert, M. (author), van Dam, S.B. (author), de Jong, N. (author), van den Berg, J.H. (author), Evers, G.P.H. (author), Hanson, R. (author)Diamond membrane devices containing optically coherent nitrogen-vacancy (NV) centers are key to enable novel cryogenic experiments such as optical ground-state cooling of hybrid spin-mechanical systems and efficient entanglement distribution in quantum networks. Here, we report on the fabrication of a (3.4 ± 0.2) μm thin, smooth (surface...journal article 2019
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van Dam, S.B. (author), Cramer, J. (author), Taminiau, T.H. (author), Hanson, R. (author)We report on the realization and application of nondestructive three-qubit parity measurements on nuclear spin qubits in diamond. We use high-fidelity quantum logic to map the parity of the joint state of three nuclear spin qubits onto an electronic spin qubit that acts as an ancilla, followed by a single-shot nondestructive readout of the...journal article 2019
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Tchebotareva, A. (author), Hermans, S.L.N. (author), Humphreys, P.C. (author), Voigt, D. (author), Harmsma, P.J. (author), Cheng, Lun K. (author), Verlaan, Ad L. (author), Dijkhuizen, Niels (author), De Jong, Wim (author), Dréau, A.E. (author), Hanson, R. (author)We report on the realization and verification of quantum entanglement between a nitrogen-vacancy electron spin qubit and a telecom-band photonic qubit. First we generate entanglement between the spin qubit and a 637 nm photonic time-bin qubit, followed by photonic quantum frequency conversion that transfers the entanglement to a 1588 nm...journal article 2019