1. A. Morvan, V. V. Ramasesh, M. S. Blok, J.M. Kreikebaum, K. O'Brien, L. Chen, B. K. Mitchell, R. K. Naik, D. I. Santiago, I. Siddiqi. "Qutrit randomized benchmarking" arXiv:2008.09134 (2020)
  2. A. Grimsmo, B. Royer, J.M. Kreikebaum, Y. Ye, K. O'Brien, I. Siddiqi, A. Blais. "Quantum metamaterial for nondestructive microwave photon counting" arXiv:2005.06483 (2020)
  3. M. S. Blok, V. V. Ramasesh, T. Schuster, K. O'Brien, J.M. Kreikebaum, D. Dahlen, A. Morvan, B. Yoshida, N. Y. Yao, I. Siddiqi. "Quantum Information Scrambling in a Superconducting Qutrit Processor" arXiv:2003.03307 (2020)
  4. J. M. Kreikebaum, K. P. O'Brien, I. Siddiqi. "Improving wafer-scale Josephson junction resistance variation in superconducting quantum coherent circuits." arXiv:1909.09165 (2019)


  1. B. Lienhard, J. Braumüller, W. Woods, D. Rosenberg, G. Calusine, S. Weber, A. Vepsäläinen, K. O'Brien, T. P. Orlando, S. Gustavsson, W. D. Oliver. "Microwave Packaging for Superconducting Qubits." Proceedings of the 2019 IEEE/MTT-S International Microwave Symposium (2019) arXiv:1906.05425
  2. L.M. Procopio, L. A. Rozema, Z. J. Wong, D. R. Hamel, K. O'Brien, X. Zhang, B. Dakić, and P. Walther. "Single-photon test of hyper-complex quantum theories using a metamaterial." Nat. Comm. 8, 15044 (2017) doi:10.1038/ncomms15044
  3. Z. J. Wong*, Y. Xu*, J. Kim*, K. O'Brien, Y. Wang, L. Feng, and X. Zhang. "Lasing and anti-lasing in a single cavity." Nat. Phot. 10, 796-801 (2016). doi:10.1038/nphoton.2016.216
  4. S. S. Kruk, Z. J. Wong, E. Pshenay-Severin, K. O'Brien, D. Neshev, and Y. S. Kivshar, and X. Zhang. "Magnetic hyperbolic optical metamaterials." Nat. Comm. 7 11329 (2016) doi:10.1038/ncomms11329
  5. K. O'Brien, C. Macklin, D. Hover, M. E. Schwartz, V. Bolkhovsky, X. Zhang, W. D. Oliver, I. Siddiqi. "Towards quantum-noise limited multiplexed microwave readout of qubits" Proceedings of the 2016 IEEE/MTT-S International Microwave Symposium (2016)doi:10.1109/MWSYM.2016.7540350
  6. F. J. Diaz, T. Hatakeyama, J. Rho, Y. Wang, K. O'Brien, X. Zhang, C. M. de Sterke, B. T. Kuhlmey, and S. Palomba. "Sensitive method for measuring third order nonlinearities in compact dielectric and hybrid plasmonic waveguides." Opt. Express 24, 545-554 (2016). doi:10.1364/OE.24.000545
  7. C. Macklin, K. O'Brien, D. Hover, M. E. Schwartz, V. Bolkhovsky, X. Zhang, W. D. Oliver, I. Siddiqi. "A near-quantum-limited Josephson traveling-wave parametric amplifier." Science 350, 307-310 (2015). doi:10.1126/science.aaa8525
  8. M. Mrejen*, H. Suchowski*, T. Hatakeyama*, C. Wu, L. Feng, K. O'Brien, Y. Wang, X. Zhang. "Adiabatic elimination-based coupling control in densely packed subwavelength waveguides." Nat. Comm. 6, 7565 (2015). doi:10.1038/ncomms8565
  9. K. O'Brien*, H. Suchowski*, J. Rho, A. Salandrino, B. Kanté, X. Yin, X. Zhang. "Predicting nonlinear properties of metamaterials from the linear response." Nat. Mat. 14, 379-383 (2015). doi:10.1038/nmat4214
  10. S. N. David, Y. Zhai, A. M. van der Zande, K. O'Brien, P. Y. Huang, D. A. Chenet, J. C. Hone, X. Zhang, and X. Yin. "Rapid, all-optical crystal orientation imaging of two-dimensional transition metal dichalcogenide monolayers." Appl. Phys. Lett. 107, 111902 (2015). doi:10.1063/1.4930232
  11. K. O'Brien, C. Macklin, I. Siddiqi, X. Zhang. "Resonant Phase Matching of Josephson Junction Traveling Wave Parametric Amplifiers." Phys. Rev. Lett. 113, 157001 (2014). doi:10.1103/PhysRevLett.113.157001
  12. Z. Ye*, T. Cao*, K. O'Brien, H. Zhu, X. Yin, Y. Wang, S. G. Louie, X. Zhang. "Probing excitonic dark states in single-layer tungsten disulphide." Nature 513, 214-218 (2014). doi:10.1038/nature13734
  13. K. O'Brien*, N. D. Lanzillotti-Kimura*, J. Rho, H. Suchowski, X. Yin, X. Zhang. "Ultrafast acousto-plasmonic control and sensing in complex nanostructures." Nat. Comm. 5, 4042 (2014). doi:10.1038/ncomms5042
  14. X. Yin*, Z. Ye*, D. A. Chenet*, Y. Ye*, K. O'Brien, J. C. Hone, X. Zhang. "Edge Nonlinear Optics on a MoS2 Atomic Monolayer." Science 344, 488-490 (2014). doi:10.1126/science.1250564
  15. H. Suchowski*, K. O'Brien*, Z. J. Wong*, A. Salandrino, X. Yin, X. Zhang. "Phase Mismatch-Free Nonlinear Propagation in Optical Zero-Index Materials." Science 342, 1223-1226 (2013). doi:10.1126/science.1244303
  16. B. Kanté, Y. Park, K. O'Brien, D. Shuldman, N. D. Lanzillotti-Kimura, Z. J. Wong, X. Yin, X. Zhang. "Symmetry breaking and optical negative index of closed nanorings." Nat. Comm. 3, 1180 (2012). doi:10.1038/ncomms2161
  17. K. O'Brien, N. D. Lanzillotti-Kimura, H. Suchowski, B. Kanté, Y. Park, X. Yin, X. Zhang. "Reflective interferometry for optical metamaterial phase measurements." Opt. Lett. 37, 4089-4091 (2012). doi:10.1364/OL.37.004089
  18. B. Kanté, K. O'Brien, A. Niv, X. Yin, X. Zhang. "Proposed isotropic negative index in three-dimensional optical metamaterials." Phys. Rev. B 85, 041103 (2012). doi:10.1103/PhysRevB.85.041103


  1. K. O'Brien. "Nonlinear Light-Matter Interactions in Metamaterials." University of California, Berkeley (2016) Link