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Dahlberg, E.A. (author), Skrzypczyk, M.D. (author), Coopmans, T.J. (author), Wubben, L.C.J. (author), Rozpdek, Filip (author), Pompili, M. (author), Stolk, A.J. (author), Pawełczak, Przemysław (author), Knegjens, R.J. (author), de Oliveira Filho, J.A. (author), Hanson, R. (author), Wehner, S.D.C. (author)Quantum communication brings radically new capabilities that are provably impossible to attain in any classical network. Here, we take the first step from a physics experiment to a quantum internet system. We propose a functional allocation of a quantum network stack, and construct the first physical and link layer protocols that turn ad-hoc...conference paper 2019
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Awschalom, David D. (author), Hanson, R. (author), Wrachtrup, Jörg (author), Zhou, Brian B. (author)Spins of impurities in solids provide a unique architecture to realize quantum technologies. A quantum register of electron and nearby nuclear spins in the lattice encompasses high-fidelity state manipulation and readout, long-lived quantum memory, and long-distance transmission of quantum states by optical transitions that coherently connect...review 2018
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Agarwal, Girish (author), Allen, Roland E. (author), Bezděková, Iva (author), Boyd, Robert W. (author), Chen, Goong (author), Hanson, R. (author), Hawthorne, Dean L. (author), Hemmer, Philip (author), Kim, Moochan B. (author), Kocharovskaya, Olga (author), Lee, D. (author), Lidström, Sebastian K. (author), Lidström, Suzy (author), Losert, Harald (author), Maier, Helmut (author), Neuberger, John W. (author), Padgett, Miles J. (author), Raizen, Mark (author), Rajendran, Surjeet (author), Rasel, Ernst (author), Schleich, Wolfgang P. (author), Scully, Marlan O. (author), Shchedrin, Gavriil (author), Shvets, Gennady (author), Sokolov, Alexei (author), Svidzinsky, Anatoly (author), Walsworth, Ronald L. (author), Weiss, Rainer (author), Wilczek, Frank (author), Willner, Alan E. (author), Yablonovich, Eli (author), Zheludev, Nikolay (author)The Winter Colloquium on the Physics of Quantum Electronics (PQE) has been a seminal force in quantum optics and related areas since 1971. It is rather mind-boggling to recognize how the concepts presented at these conferences have transformed scientific understanding and human society. In January 2017, the participants of PQE were asked to...journal article 2018
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Kalb, N. (author), Humphreys, P.C. (author), Slim, J. J. (author), Hanson, R. (author)We probe dephasing mechanisms within a quantum network node consisting of a single nitrogen-vacancy center electron spin that is hyperfine coupled to surrounding C13 nuclear-spin quantum memories. Previous studies have analyzed memory dephasing caused by the stochastic electron-spin reset process, which is a component of optical internode...journal article 2018
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Dréau, A.E. (author), Tcheborateva, Anna (author), El Mahdaoui, A. (author), Bonato, C. (author), Hanson, R. (author)We report on the conversion to telecommunication wavelengths of single photons emitted by a nitrogen-vacancy (NV) defect in diamond. By means of difference frequency generation, we convert spin-selective photons at 637 nm, associated with the coherent NV zero-phonon line, to the target wavelength of 1588 nm in the L-telecommunication band....journal article 2018
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Humphreys, P.C. (author), Kalb, N. (author), Morits, J.P.J. (author), Schouten, R.N. (author), Vermeulen, R.F.L. (author), Twitchen, Daniel J. (author), Markham, Matthew (author), Hanson, R. (author)Large-scale quantum networks promise to enable secure communication, distributed quantum computing, enhanced sensing and fundamental tests of quantum mechanics through the distribution of entanglement across nodes <sup>1-7</sup>. Moving beyond current two-node networks <sup>8-13</sup> requires the rate of entanglement generation between nodes...journal article 2018
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Rozpedek, F.D. (author), Goodenough, K.D. (author), Ribeiro, J.D. (author), Kalb, N. (author), Caprara Vivoli, V. (author), Reiserer, A.A. (author), Hanson, R. (author), Wehner, S.D.C. (author), Elkouss Coronas, D. (author)Quantum key distribution allows for the generation of a secret key between distant parties connected by a quantum channel such as optical fibre or free space. Unfortunately, the rate of generation of a secret key by direct transmission is fundamentally limited by the distance. This limit can be overcome by the implementation of so-called...journal article 2018
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Wehner, S.D.C. (author), Elkouss Coronas, D. (author), Hanson, R. (author)The internet-a vast network that enables simultaneous long-range classical communication-has had a revolutionary impact on our world. The vision of a quantum internet is to fundamentally enhance internet technology by enabling quantum communication between any two points on Earth. Such a quantum internet may operate in parallel to the...review 2018
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van Dam, S.B. (author), Ruf, M.T. (author), Hanson, R. (author)Defect centres in diamond are promising building blocks for quantum networks thanks to a long-lived spin state and bright spin-photon interface. However, their low fraction of emission into a desired optical mode limits the entangling success probability. The key to overcoming this is through Purcell enhancement of the emission. Open Fabry...journal article 2018
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Bogdanovic, S. (author), Liddy, M.S.Z. (author), van Dam, S.B. (author), Coenen, Lisanne C. (author), Flink, Thomas (author), Loncar, M. (author), Hanson, R. (author)Coupling nitrogen-vacancy (NV) centers in diamonds to optical cavities is a promising way to enhance the efficiency of diamond-based quantum networks. An essential aspect of the full toolbox required for the operation of these networks is the ability to achieve the microwave control of the electron spin associated with this defect within the...journal article 2017
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Bogdanovic, S. (author), van Dam, S.B. (author), Bonato, C. (author), Coenen, Lisanne C. (author), Zwerver, A.M.J. (author), Hensen, B.J. (author), Liddy, M.S.Z. (author), Fink, Thomas (author), Reiserer, A.A. (author), Loncar, M. (author), Hanson, R. (author)We report on the fabrication and characterization of a Fabry-Perot microcavity enclosing a thin diamond membrane at cryogenic temperatures. The cavity is designed to enhance resonant emission of single nitrogen-vacancy centers by allowing spectral and spatial tuning while preserving the optical properties observed in bulk diamond. We demonstrate...journal article 2017
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van Dam, S.B. (author), Humphreys, P.C. (author), Rozpedek, F.D. (author), Wehner, S.D.C. (author), Hanson, R. (author)Quantum networks distributed over distances greater than a few kilometres will be limited by the time required for information to propagate between nodes. We analyse protocols that are able to circumvent this bottleneck by employing multi-qubit nodes and multiplexing. For each protocol, we investigate the key network parameters that determine...journal article 2017
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Kalb, N. (author), Reiserer, A.A. (author), Humphreys, P.C. (author), Bakermans, J.J.W. (author), Kamerling, S. J. (author), Nickerson, N. H. (author), Benjamin, S. C. (author), Twitchen, Daniel J. (author), Markham, M (author), Hanson, R. (author)The impact of future quantum networks hinges on high-quality quantum entanglement shared between network nodes. Unavoidable imperfections necessitate a means to improve remote entanglement by local quantum operations. We realize entanglement distillation on a quantum network primitive of distant electron-nuclear two-qubit nodes. The heralded...journal article 2017
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Kalb, N. (author), Cramer, J. (author), Twitchen, D. J. (author), Markham, M. (author), Hanson, R. (author), Taminiau, T.H. (author)Repeated observations inhibit the coherent evolution of quantum states through the quantum Zeno effect. In multi-qubit systems this effect provides opportunities to control complex quantum states. Here, we experimentally demonstrate that repeatedly projecting joint observables of multiple spins creates quantum Zeno subspaces and...journal article 2016
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Cramer, J. (author), Kalb, N. (author), Rol, M.A. (author), Hensen, B.J. (author), Blok, M.S. (author), Markham, M. (author), Twitchen, D. J. (author), Hanson, R. (author), Taminiau, T.H. (author)Reliable quantum information processing in the face of errors is a major fundamental and technological challenge. Quantum error correction protects quantum states by encoding a logical quantum bit (qubit) in multiple physical qubits. To be compatible with universal fault-tolerant computations, it is essential that states remain encoded at all...journal article 2016
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Reiserer, A.A. (author), Kalb, N. (author), Blok, M.S. (author), van Bemmelen, Koen J M (author), Taminiau, T.H. (author), Hanson, R. (author), Twitchen, Daniel J. (author), Markham, Matthew (author)The realization of a network of quantum registers is an outstanding challenge in quantum science and technology. We experimentally investigate a network node that consists of a single nitrogen-vacancy center electronic spin hyperfine coupled to nearby nuclear spins. We demonstrate individual control and readout of five nuclear spin qubits...journal article 2016
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Hensen, B.J. (author), Kalb, N. (author), Blok, M.S. (author), Dréau, A.E. (author), Reiserer, A.A. (author), Vermeulen, R.F.L. (author), Schouten, R.N. (author), Markham, M. (author), Twitchen, D.J. (author), Goodenough, K.D. (author), Elkouss Coronas, D. (author), Wehner, S.D.C. (author), Taminiau, T.H. (author), Hanson, R. (author)The recently reported violation of a Bell inequality using entangled electronic spins in diamonds (Hensen et al., Nature 526, 682–686) provided the first loophole-free evidence against local-realist theories of nature. Here we report on data from a second Bell experiment using the same experimental<br/>setup with minor modifications. We find a...journal article 2016
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The state of a turbulent boundary layer developing under the influence of different types of freestream turbulence (FST) is examined. Different FST conditions with different length scales and turbulence intensity levels are generated using an active grid. Experiments are performed using two different techniques allowing simultaneous measurements...conference paper 2015
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Hanson, R. (author)Spin qubits in diamond provide an excellent platform both for fundamental tests and for realizing extended quantum networks . Here we present our latest results, including the deterministic teleportation over three meters.conference paper 2014
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Bonato, C. (author), Blok, M.S. (author), Markham, M.L. (author), Twitchen, D.J. (author), Dobrovitski, V.V. (author), Hanson, R. (author)We report the control-free manipulation of a nuclear spin qubit in diamond, using only the backaction of sequential partial measurements with real-time feedback.conference paper 2014