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)
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)
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)
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)
Publications
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
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
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
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
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
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. Express24, 545-554 (2016). doi:10.1364/OE.24.000545
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." Science350, 307-310 (2015). doi:10.1126/science.aaa8525
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
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
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
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
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." Nature513, 214-218 (2014). doi:10.1038/nature13734
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
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." Science344, 488-490 (2014). doi:10.1126/science.1250564
H. Suchowski*, K. O'Brien*, Z. J. Wong*, A. Salandrino, X. Yin, X. Zhang. "Phase Mismatch-Free Nonlinear Propagation in Optical Zero-Index Materials." Science342, 1223-1226 (2013). doi:10.1126/science.1244303
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
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
B. Kanté, K. O'Brien, A. Niv, X. Yin, X. Zhang. "Proposed isotropic negative index in three-dimensional optical metamaterials." Phys. Rev. B85, 041103 (2012).
doi:10.1103/PhysRevB.85.041103
Theses
K. O'Brien. "Nonlinear Light-Matter Interactions in Metamaterials." University of California, Berkeley (2016) Link