Publications

Publications of the Physics of Quantum Devices team and Caspar H. van der Wal

  • Work on quantum coherent dynamics and electron spins in solid state devices (recent publications)
    69. Quantum communication networks with defects in silicon carbide
    Sebastian Ecker, Matthias Fink, Thomas Scheidl, Philipp Sohr, Rupert Ursin, Muhammad Junaid Arshad, Cristian Bonato, Pasquale Cilibrizzi, Adam Gali, Peter Udvarhelyi, Alberto Politi, Oliver J. Trojak, Misagh Ghezellou, Jawad Ul Hassan, Ivan G. Ivanov, Nguyen Tien Son, Guido Burkard, Benedikt Tissot, Joop Hendriks, Carmem M. Gilardoni, Caspar H. van der Wal, Christian David, Thomas Astner, Philipp Koller, Michael Trupke,
    submitted; also available at arXiv:2403.03284.
    68. Charge dynamics in the 2D/3D semiconductor heterostructure WSe2/GaAs
    Rafael R. Rojas-Lopez, Freddie Hendriks, Caspar H. van der Wal, Paulo S. S. Guimarães, Marcos H. D. Guimaraes,
    submitted; also available at arXiv:2309.14067.
    67. Magnetic field control of light-induced spin accumulation in monolayer MoSe2
    Rafael R. Rojas-Lopez, Freddie Hendriks, Caspar H. van der Wal, Paulo S. S. Guimarães, Marcos H. D. Guimaraes,
    2D Materials 10, 035013 (2023); also available at arXiv:2302.14206.
    66. Coherent spin dynamics of hyperfine-coupled vanadium impurities in silicon carbide
    Joop Hendriks, Carmem M. Gilardoni, Chris Adambukulam, Arne Laucht, Caspar H. van der Wal,
    submitted (2023); available at arXiv:2210.09942.
    65. Vanadium in silicon carbide: Telecom-ready spin centres with long relaxation lifetimes and hyperfine-resolved optical transitions
    Thomas Astner, Philipp Koller, Carmem M. Gilardoni, Joop Hendriks, Nguyen Tien Son, Ivan Gueorguiev Ivanov, Jawad Ul Hassan, Caspar H. van der Wal, Michael Trupke,
    submitted (2022); available at arXiv:2206.06240.
    64. Electromagnetically induced transparency in inhomogeneously broadened divacancy
    defect ensembles in SiC
    Olger V. Zwier, Tom Bosma, Carmem M. Gilardoni, Xu Yang, Alexander R. Onur, Takeshi Ohshima, Nguyen T. Son, Caspar H. van der Wal,
    J. Appl. Phys. 131, 094401 (2022) (Special issue on Defects in Semiconductors, 2022); doi (open access); also available at arXiv:2203.09869.
    63. Broadband single-mode planar waveguides in monolithic 4H-SiC
    Tom Bosma, Joop Hendriks, Misagh Ghezellou, Nguyen T. Son, Jawad Ul Hassan, Caspar H. van der Wal,
    J. Appl. Phys. 131, 025703 (2022) (Special issue on Defects in Semiconductors, 2022); doi (open access); also available at arXiv:2202.10932.
    62. Hyperfine-mediated transitions between electronic spin-1/2 levels of transition metal defects in SiC
    Carmem M. Gilardoni, Irina Ion, Freddie Hendriks, Michael Trupke, Caspar H. van der Wal,
    New J. Phys. 23, 083010 (2021); doi (open access); also available at arXiv:2104.12433.
    61. Symmetry and control of spin-scattering processes in two-dimensional transition metal dichalcogenides
    Carmem M. Gilardoni, Freddie Hendriks, Caspar H. van der Wal, Marcos H.D. Guimaraes,
    Phys. Rev. B 103, 115410 (2021); pdf file; doi; also available at arXiv:2101.01565.
    60. The role of device asymmetries and Schottky barriers on the helicity-dependent photoresponse of 2D phototransistors
    Jorge Quereda, Jan Hidding, Talieh S. Ghiasi, Bart J. van Wees, Caspar H. van der Wal, Marcos H.D. Guimaraes,
    npj 2D Materials and Applications 5, 13 (2021); doi (open access); also available at arXiv:2008.09023.
    59. Detecting chirality in two-terminal electronic nanodevices
    Xu Yang, Caspar H. van der Wal, Bart J. van Wees,
    Nano Letters 20, 6148 (2020); pdf file; doi; also available at arXiv:1912.09085.
    Link to news item / press release.
    58. Spin-relaxation times exceeding seconds for color centers with strong spin-orbit coupling in SiC
    Carmem M. Gilardoni*, Tom Bosma*, Danny van Hien, Freddie Hendriks, Björn Magnusson, Alexandre Ellison, Ivan G. Ivanov, N. T. Son, Caspar H. van der Wal,
    New J. Phys. 22, 103051 (2020); doi (open access); also available at arXiv:1912.04612.
    Link to news item / press release.
    57. Reply to Comment on Spin-dependent electron transmission model for chiral molecules in mesoscopic devices
    Xu Yang, Caspar H. van der Wal, Bart J. van Wees,
    Phys Rev. B 101, 026404 (2020); pdf file; doi; also available at arXiv:2002.10786.
    56. Characterization of low-resistance ohmic contacts to a
    two-dimensional electron gas in a GaAs/AlGaAs heterostructure
    (Robust recipe for low-resistance ohmic contacts to a two-dimensional electron gas in a GaAs/AlGaAs heterostructure)
    M. J. Iqbal, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Eur. Phys. J. Appl. Phys. 89, 20101 (2020); pdf file; doi; early version also available at arXiv:1407.4781.
    55. Circuit-model analysis for spintronic devices with chiral molecules as spin injectors
    Xu Yang, Tom Bosma, Bart J. van Wees, Caspar H. van der Wal,
    Phys Rev. B 99, 214428 (2019); pdf file; doi; also available at arXiv:1904.03142.
    54. Evolution of atomic optical selection rules upon gradual symmetry lowering
    G. J. J. Lof, C. H. van der Wal, R. W. A. Havenith,
    submitted (2019); available at arXiv:1810.06355.
    53. Semiconductor channel-mediated photodoping in h-BN encapsulated monolayer MoSe2 phototransistors
    Jorge Quereda, Talieh S. Ghiasi, Caspar H. van der Wal, Bart J. van Wees,
    2D Materials 6, 025040 (2019); doi (open access); also available at arXiv:1903.01917.
    52. Spin-dependent electron transmission model for chiral molecules in mesoscopic devices
    Xu Yang, Caspar H. van der Wal, Bart J. van Wees,
    Phys Rev. B 99, 024418 (2019); pdf file; doi; also available at arXiv:1810.02662.
    Link to News item at Phys.org
    51. Symmetry regimes for circular photocurrents in monolayer MoSe2
    Jorge Quereda, Talieh S. Ghiasi, Jhih-Shih You, Jeroen van den Brink, Bart J. van Wees, Caspar H. van der Wal,
    Nature Communications 9, 3346 (2018); pdf file; pdf file suppl. info.; doi (open access); also available at arXiv:1803.08289.
    50. Identification and tunable optical coherent control of transition-metal spins in silicon carbide
    Tom Bosma*, Gerrit J. J. Lof*, Carmem M. Gilardoni, Olger V. Zwier, Freddie Hendriks, Alexandre Ellison, Björn Magnusson, Andreas Gällström, Ivan G. Ivanov, N. T. Son, Remco W. A. Havenith, Caspar H. van der Wal,
    npj Quantum Information 4, 48 (2018); pdf file; pdf file suppl. info.; doi (open access); also available at arXiv:1802.06714.
    News Several news outlets covered the above publication [Dutch and English], see for example Photonics, Eureka Science Alerts, New Scientist, and De Ingenieur.Groningen Science LinX topical news item about this work [Dutch and English].

            

    49. Observation of bright and dark exciton transitions in monolayer MoSe2 by photocurrent spectroscopy
    Jorge Quereda, Talieh S. Ghiasi, Feitze A. van Zwol, Caspar H. van der Wal, Bart J. van Wees,
    2D Materials 5, 015004 (2018); pdf file; pdf file suppl. info.; doi (open access); also available at arXiv:1708.09176.
    48. Two-laser dynamic nuclear polarization with semiconductor electrons: feedback, suppressed fluctuations, and bistability near two-photon resonance
    A. R. Onur, C. H. van der Wal,
    Phys. Rev. B 98, 165304 (2018); pdf file; doi; also available at arXiv:1409.7576.
    47. Electronic properties of germanane field-effect transistors
    B. N. Madhushankar, A. Kaverzin, T. Giousis, G. Potsi, D. Gournis, P. Rudolf, G. R. Blake, C. H. van der Wal, B. J. van Wees,
    2D Materials 4, 021009 (2017); pdf file; pdf file suppl. info.; doi (open access).
    46. Stabilizing nuclear spins around semiconductor electrons via the interplay of optical coherent population trapping and dynamic nuclear polarization
    A. R. Onur*, J. P. de Jong*, D. O’Shea, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Phys. Rev. B 93, 161204(R) (2016); pdf file; doi; open access; also available at arXiv:1501.04524.
    45. All-optical coherent population trapping with defect spin ensembles in silicon carbide
    Olger V. Zwier, Danny O’Shea, Alexander R. Onur, Caspar H. van der Wal,
    Scientific Reports 5, 10931 (2015);
    pdf file main text; pdf file suppl. info.; doi (open access); also available at arXiv:1411.1366.
    44. Analysis of optical differential transmission signals from co-propagating fields in a lambda system medium
    J. P. de Jong, A. R. Onur, D. Reuter, A. D. Wieck, C. H. van der Wal,
    available at arXiv:1409.7679.
    43. Odd and even Kondo effects from emergent localization in quantum point contacts
    M. J. Iqbal, Roi Levy, E. J. Koop, J. B. Dekker, J. P. de Jong, J. H. M. van der Velde, D. Reuter, A. D. Wieck, Ramón Aguado, Yigal Meir, C. H. van der Wal,
    Nature 501, 79 (2013); pdf file main text; pdf file suppl. info.; pdf file news and views; doi; open access; preprint version available at arXiv:1307.7167.
    News News items on the above publication:

    Link to News & Views item about this work and a related work (Nature Physics 9, 530 (2013)).Groningen Science LinX topical news item about this work [Dutch and English].

    University press release about this work (Dutch and English).
    42. Split-gate quantum point contacts with tunable channel length
    M. J. Iqbal, J. P. de. Jong, D. Reuter, A. D. Wieck, C. H. van der Wal,
    J. Appl. Phys. 113, 024507 (2013); pdf file; also available at arXiv:1207.1331.
    41. On the annealing mechanism of AuGe/Ni/Au ohmic contacts to a two-dimensional electron gas in GaAs/AlGaAs heterostructures
    E. J. Koop, M. J. Iqbal, F. Limbach, M. Boute, B. J. van Wees, D. Reuter, A. D. Wieck, B. J. Kooi, C. H. van der Wal,
    Semicond. Sci. Technol. 28, 025006 (2013);
    pdf file; also available at arXiv:0809.0928.
    40. Ultrafast mapping of optical polarization states onto spin coherence of localized electrons in a semiconductor
    S. Z. Denega, M. Sladkov, D. Reuter, A. D. Wieck, T. L. C. Jansen, C. H. van der Wal,
    available at arXiv:1103.4307.
    39. Public exhibit for demonstrating the quantum of electrical conductance [on an educational project]
    E. H. Huisman, F. L. Bakker, J. P. van der Pal, R. M. de Jonge, C. H. van der Wal,
    Am. J. Phys. 79, 856 (2011); pdf file;
    also available at arXiv:1103.3739.
    38. Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field
    M. Sladkov, M. P. Bakker, A. U. Chaubal, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Rev. Sci. Instr. 82, 043105 (2011);
    pdf file; open access; also available at arXiv:1010.1849.
    37. Electromagnetically induced transparency in low-doped n-GaAs
    C. H. van der Wal, M. Sladkov, A. U. Chaubal, M. P. Bakker, A. R. Onur, D. Reuter, A. D. Wieck,
    AIP Conf. Proc. 1399, 1039 (2011) [Proceedings of the 30th International Conference on the Physics of Semiconductors (ICPS 2010)];
    pdf file.
    36. Electromagnetically induced transparency with an ensemble of donor-bound electron spins in a semiconductor
    Maksym Sladkov, A. U. Chaubal, M. P. Bakker, A. R. Onur, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Phys. Rev. B 82, 121308(R) (2010);
    pdf file; open access; doi; also available at arXiv:1007.1010.
    35. Suppressed spin dephasing for two-dimensional and bulk electrons in GaAs wires due to engineered cancelation of spin-orbit interaction terms
    S. Z. Denega, T. Last, J. Liu, A. Slachter, P. J. Rizo, P. H. M. van Loosdrecht, B. J. van Wees, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Phys. Rev. B 81, 153302 (2010);
    pdf file; open access; also available at arXiv:0910.2336.
    34. Optical probing of spin dynamics of two-dimensional and bulk electrons in a GaAs/AlGaAs heterojunction system
    P. J. Rizo, A. Pugzlys, A. Slachter, S. Z. Denega, D. Reuter, A. D. Wieck, P. H. M. van Loosdrecht, C. H. van der Wal,
    New J. Phys. 12, 113040 (2010);
    pdf file; doi (open access); also available at arXiv:0910.1714.
    33. Spin-dephasing anisotropy for electrons in a diffusive quasi-1D GaAs wire
    J. Liu, T. Last, E. J. Koop, S. Denega, B. J. van Wees, C. H. van der Wal,
    J. Supercond. Nov. Magn. 23, 11 (2010);
    pdf file; open access; also available at arXiv:0810.1413.
    32. Towards quantum optics and entanglement with electron spin ensembles in semiconductors
    Caspar H. van der Wal, Maksym Sladkov,
    Solid State Sciences 11, 935 (2009)
    [special issue on Solid state approaches to quantum information processing and communication];
    pdf file; open access; also available at arXiv:0804.2953.
    31. Compact cryogenic Kerr microscope for time-resolved studies of electron spin transport in microstructures
    P. J. Rizo, A. Pugzlys, J. Liu, D. Reuter, A. D. Wieck, C. H. van der Wal, P. H. M. van Loosdrecht,
    Rev. Sci. Instr. 79, 123904 (2008);
    pdf file; open access; also available at arXiv:0809.3209.
    30. Confinement-enhanced spin relaxation for electron ensembles in large quantum dots
    E. J. Koop, B. J. van Wees, C. H. van der Wal,
    available at arXiv:0804.2968.
    29. Spin accumulation and spin relaxation in a large open quantum dot
    E. J. Koop, B. J. van Wees, D. Reuter, A. D. Wieck, C. H. van der Wal,
    Phys. Rev. Lett. 101, 056602 (2008);
    pdf file; open access; also available at arXiv:0801.2699.
    28. Electrical detection of spin pumping:
    dc voltage generated by ferromagnetic resonance at ferromagnet/nonmagnet contact
    M. V. Costache, S. M. Watts, C. H. van der Wal, B. J. van Wees,
    Phys. Rev. B 78, 064423 (2008);
    pdf file; open access;also available at arXiv:0809.3859.
    27. Persistence of the 0.7 anomaly of quantum point contacts in high magnetic fields
    E. J. Koop, A. I. Lerescu, J. Liu, B. J. van Wees, D. Reuter, A. D. Wieck, C. H. van der Wal,
    available at arXiv:0706.0792.
    26. The influence of device geometry on many-body effects in quantum point contacts: Signatures of the 0.7 anomaly, exchange and Kondo
    E. J. Koop, A. I. Lerescu, J. Liu, B. J. van Wees, D. Reuter, A. D. Wieck, C. H. van der Wal,
    J. Supercond. Nov. Magn. 20, 433 (2007);
    pdf file; open access; also available at arXiv:0708.0294.
    25. Non-local detection of resistance fluctuations of an open quantum dot
    A. I. Lerescu, E. J. Koop, C. H. van der Wal, B. J. van Wees,
    J. H. Bardarson,
    available at arXiv:0705.3179.
    24. Charge and spin dynamics in a two dimensional electron gas
    A. Pugzlys, P. J. Rizo, K. Ivanin, A. Slachter, D. Reuter, A. D. Wieck,
    C. H. van der Wal, P. H. M. van Loosdrecht,
    J. Phys.: Condens. Matter 19, 295206 (2007);
    pdf file; open access; also available at arXiv:cond-mat/0610783.
    23. Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
    M. V. Costache, M. Sladkov, S. M. Watts, C. H. van der Wal, B. J. van Wees,
    Phys. Rev. Lett. 97, 216603 (2006);
    pdf file; open access; also available at arXiv:cond-mat/0609089.
    22. Large cone angle magnetization precession of an individual nanopatterned ferromagnet with dc electrical detection
    M. V. Costache, S. M. Watts, M. Sladkov, C. H. van der Wal, B. J. van Wees,
    Appl. Phys. Lett. 89, 232115 (2006);
    pdf file; open access; also available at arXiv:cond-mat/0609190.
    21. On-chip detection of ferromagnetic resonance of a single submicron Permalloy strip
    M. V. Costache, M. Sladkov, C. H. van der Wal, B. J. van Wees,
    Appl. Phys. Lett. 89, 192506 (2006);
    pdf file; open access; also available at arXiv:cond-mat/0607036.


    Appl. Phys. Lett. cover image.
    20. Unified description of bulk and interface-enhanced spin pumping
    S. M. Watts, J. Grollier, C. H. van der Wal, B. J. van Wees,
    Phys. Rev. Lett. 96, 077201 (2006);
    pdf file; open access; also available at arXiv:cond-mat/0509100.
    19. Microwave spectroscopy on magnetization reversal dynamics of nanomagnets with electronic detection
    J. Grollier, M. V. Costache, C. H. van der Wal, B. J. van Wees,
    J. Appl. Phys. 100, 024316 (2006);
    pdf file; open access; also available at arXiv:cond-mat/0502197.

    Work on quantum optics with atoms (postdoc C. H. van der Wal)
    18. Capacitive coupling of atomic systems to mesoscopic conductors
    Anders S. Sørensen, Caspar H. van der Wal, Lilian I. Childress, Mikhail D. Lukin,
    Phys. Rev. Lett. 92, 063601 (2004);
    pdf file; open access; also available at arXiv:quant-ph/0308145.
    17. Atomic memory for correlated photon states
    C. H. van der Wal, M. D. Eisaman, A. Andre, R. L. Walsworth,
    D. F. Phillips,
    A. S. Zibrov, M. D. Lukin,
    Science 301, 196 (2003);
    pdf file; supporting online material; pdf file; doi; open access.
    16. Towards non-classical light storage via atomic-vapor Raman scattering
    C. H. van der Wal, M. D. Eisaman, A. S. Zibrov, A. Andre, D. F. Phillips,
    R. L. Walsworth, M. D. Lukin,
    Proc. of SPIE 5115, 236 (2003),
    (Noise and Information in Nanoelectronics, Sensors and Standards,
    L. B. Kish, F, Green, G. Iannaccone, J. R. Vig, eds. (SPIE, Bellingham, WA, 2003));
    pdf file; open access.
    15. Toward manipulating quantum information with atomic ensembles
    M. D. Lukin, A. Andre, M. D. Eisaman, M. Hohensee, D. F. Phillips,
    C. H. van der Wal, R. L. Walsworth, A. S. Zibrov,
    in Proceedings of the XVIII International Conference on Atomic Physics,
    H. R. Sadeghpour, D. E. Pritchard, E. J. Heller, eds. (World Scientific, Singapore, 2003), pp. 231-240;
    pdf file; open access.

    Work on quantum coherent solid state devices (PhD research C. H. van der Wal)
    14. Decoherence of flux qubits coupled to electronic circuits
    F. K. Wilhelm, M. J. Storcz, C. H. van der Wal,
    C. J. P. M. Harmans, J. E. Mooij,
    Advances in Solid State Physics 43, 763 (2003);
    pdf file; also available at arXiv:cond-mat/0305349.
    13. Quantum superposition of charge states on capacitively coupled superconducting islands
    C. P. Heij, D. C. Dixon, C. H. van der Wal, P. Hadley, J. E. Mooij,
    Phys. Rev. B 67, 144512 (2003);
    pdf file; open access.
    12. Flux-based superconducting qubits for quantum computation
    T. P. Orlando, S. Lloyd, L. S. Levitov, K. K. Berggren, M. J. Feldman,
    M. F. Bocko, J. E. Mooij, C. J. P. Harmans, C. H. van der Wal,
    Phys. C 372, 194 (2002);
    pdf file; open access.
    11. Engineering the quantum measurement process for the persistent current qubit
    T. P. Orlando, Lin Tian, D. S. Crankshaw, S. Lloyd, C. H. van der Wal,
    J. E. Mooij, F. Wilhelm,
    Phys. C 368, 294 (2002);
    pdf file; open access.
    10. Engineering decoherence in Josephson persistent-current qubits: Measurement apparatus and other electromagnetic environments
    Caspar H. van der Wal, F. K. Wilhelm, C. J. P. M. Harmans, J. E. Mooij,
    Eur. Phys. J. B 31, 111 (2003);
    pdf file; open access; also available at arXiv:cond-mat/0211664.
    9. Dual charge and vortex superpositions in a small Josephson junction array
    Caspar H. van der Wal, J. E. Mooij,
    pdf file.
    8. Macroscopic quantum superposition of current states
    in a Josephson-junction loop
    F. K. Wilhelm, C. H. van der Wal, A. C. J. ter Haar, R. N. Schouten,
    C. J. P. M. Harmans, J. E. Mooij, T. P. Orlando, Seth Lloyd,
    Usp. Fiz. Nauk (Suppl.) 171, 117 (2001);
    pdf file; open access.
    7. Macroscopic quantum superposition in a
    three-Josephson-junction loop
    Caspar H. van der Wal, A. C. J. ter Haar, F. K. Wilhelm, R. N. Schouten,
    C. J. P. M. Harmans, T. P. Orlando, Seth Lloyd, J. E. Mooij,
    in Macroscopic Quantum Coherence and Quantum Computing,
    D.V. Averin, B. Ruggiero, P. Silvestrini, eds. (Kluwer Academic Publishers, Dordrecht, 2001), pp. 25-34;
    pdf file; open access.
    6. Quantum superposition of macroscopic persistent-current states
    Caspar H. van der Wal, A. C. J. ter Haar, F. K. Wilhelm,
    R. N. Schouten,
    C. J. P. M. Harmans, T. P. Orlando, Seth Lloyd, J. E. Mooij,
    Science 290, 773 (2000);
    pdf file; open access.
    [ This publication was ranked in the Science Magazine top 10 Breakthroughs of the Year 2000. ]
    5. Decoherence of the superconducting persistent-current qubit
    Lin Tian, L. S. Levitov, J. E. Mooij, T. P. Orlando, Caspar H. van der Wal, Seth Lloyd,
    in Quantum Mesoscopic Phenomena and Mesoscopic Devices in Microelectronics, I. O. Kulik, R. Ellialtioglu, eds. (Kluwer Academic Publishers, Dordrecht, 2000), pp. 429-438;
    pdf file; open access; also available at arXiv:cond-mat/9910062.
    4. Quantum transitions of a small Josephson junction array
    Caspar H. van der Wal, P. Kuiper, J. E. Mooij,
    Phys. B 280, 243 (2000);
    pdf file; open access.
    3. Superconducting persistent-current qubit
    T. P. Orlando, J. E. Mooij, Lin Tian, Caspar H. van der Wal,
    L. S. Levitov, Seth Lloyd, J. J. Mazo,
    Phys. Rev. B 60, 15398 (1999);
    pdf file; open access; also available at arXiv:cond-mat/9908283.
    2. Josephson persistent-current qubit
    J. E. Mooij, T. P. Orlando, L. Levitov, Lin Tian, Caspar H. van der Wal, Seth Lloyd,
    Science 285, 1036 (1999);
    pdf file; open access.
    1. Controlled single-Cooper-pair charging effects in a small Josephson junction array
    Caspar H. van der Wal, J. E. Mooij,
    J. Superc. 12, 807 (1999);
    pdf file; preprint with high-resolution figures pdf file; open access.

    Other publications (perspectives, society journals, popular articles)
    P8. Building blocks for a quantum internet
    Joop Hendriks, Caspar van der Wal,
    FranckenVrij (2020-2021) [student magazine for applied physics students]; pdf file.
    P7. Het beste niets ooit gemaakt: een blok silicium [in Dutch]
    Caspar van der Wal,
    contribution to the book Het beste idee van 2014, ISBN 978-90-79051-11-3 (Uitgeverij de Wereld, 2014); pdf file.
    P6. Controlling spins and photons for fundamentally secure communication
    Caspar van der Wal,
    Lustrum book 2009-2014 Applied Physics student society Professor Francken (University of Groningen, Oct. 2014); pdf file.
    P5. Veilig communiceren met quantummechanica [in Dutch]
    Caspar van der Wal,
    Nederlands Tijdschrift voor Natuurkunde 80, 186 (juni 2014); pdf file.
    P4. De wet van Moore voor zonnecellen [in Dutch]
    Caspar van der Wal,
    contribution to the book Het beste idee van 2013, ISBN 978-90-79051-09-0 (Uitgeverij de Wereld, 2013); pdf file.
    P3. Quantumoptica met spins in halfgeleiders [in Dutch]
    Sander Onur, Caspar van der Wal,
    Nederlands Tijdschrift voor Natuurkunde 78, 231 (juli 2012); pdf file.
    P2. Securing communication with quantum physics
    Caspar van der Wal,
    Periodiek (jaargang 2011 nummer 4) [student magazine for physics and math students]; pdf file.
    P1. Solid start for solid-state quantum bits
    Caspar van der Wal, Leo Kouwenhoven,
    Physics World 12, 21 (July 1999); pdf file; doi. Andrew Steane wrote a comment on this “Physics in Action” in the issue of September 1999, I agree with most of his critique.