Dr. Roberto Ramos

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Home > Selected Scholarly Activity

Selected Scholarly Activity

(Refereed Publications)

 

  1. "Microwave resonant activation in hybrid single-gap/two-gap Josephson tunnel junctions," S. Carabello, J. Lambert, J. Mlack, W. Dai, Q. Li, K. Chen, D. Cunnane, X. X. Xi, and R. C. Ramos, J. Appl. Phys. 120, 123904 (2016)
  2. “Energy Gap Substructures in Conductance Measurements of MgB2-based Josephson Junctions: Beyond the 2-Gap Model” , S. Carabello, J. Lambert, J. Mlack, W. Dai, Q. Li, K. Chen, D. Cunnane, X. X. Xi, and R. C. Ramos, Supercond. Sci. Technol. 28 (2015) 055015.
  3. “Fabry-Perot Interferences in Large Aspect Ratio Single-layer Graphene Junctions on SiO2/Si Substrates”, in preparation for submission (2016)
  4. “Multi-photon Transitions in a large MgB2-based Josephson junctions”, in preparation for submission (2016).
  5. “Momentum-dependent multiple gaps of MgB2 probed by electron tunneling spectroscopy on MgB2/native oxide/Pb junctions”, K. Chen, W. Dai, C.G. Zhuang, Q. Li, S. Carabello, J. Lambert, J. Mlack, R. C. Ramos and X. X. Xi, Nat. Commun. 3 : 619 doi: 10.1038/ncomms1626 (2012).
  6. “Differential Conductance Measurements of MgB2-based Josephson junctions below 1 Kelvin”, S. Carabello, J. Lambert, J. Mlack and R.C. Ramos, IEEE Trans. in Appl. Supercond. 21 (3), pp. 3083-3085. Selected for pre-publication in the European Superconductivity News Forum Issue 15, Jan. 2011. Reprint: http://www.ewh.ieee.org/tc/csc/europe/newsforum/pdf/2010-ASC/ST206.pdf
  7.  “Analysis of Possible Quantum Metastable States in Ballistic Graphene-based Josephson junctions”, J. Lambert, S. C. Carabello, and R. C. Ramos,  IEEE Trans. in Appl. Supercond. 21 (3), pp. 734-737 (2011).  Reprint: http://arxiv.org/abs/0908.0713
  8.  “Quantum Metastable States in Superconducting Graphene Josephson Junction Devices”, J. Lambert, S. Carabello, Z. Thrailkill, and R.C. Ramos, ISEC Conference Proceedings (2009).
  9. “The Geometric Phase in the Josephson Phase Qubit”, A. Tyler and R.C. Ramos,  ISEC 2009 Conference Proceedings.
  10. “Modeling Three- and Four- Coupled Phase Qubits”, Z. Thrailkill, S. Kennerly and R.C. Ramos,  IEEE Trans on Appl. Supercond 19(3), 968 (2009). Selected  for pre-publication in the European Superconducting News Forum.
  11.  “Energies and Entanglement in Multiply-coupled Phase Qubit Systems”, Z. Thrailkill, S. Kennerly, A. Tyler and R.C. Ramos, J. Phys: Conf. Ser.150, 052268 (2009).  
  12. “Decoherence in dc SQUID phase qubits,” H. Paik, S. K. Dutta, R. M. Lewis, T. A. Palomaki, B. K. Cooper, R. C. Ramos, H. Xu, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, Phys. Rev. B 77, 214510-1 through 214510-6 (2008).
  13. "Measurements of Decoherence in Three dc SQUID Phase Qubits", H. Paik, B. K. Cooper, S. K. Dutta, R. M. Lewis, R. C. Ramos, T. A. Palomaki, A. J. Przybysz, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, IEEE Trans. Appl. Supercond. 17, 120-123 (2007).
  14. “Initializing the flux state of multiwell inductively isolated Josephson junction qubits," T. A. Palomaki, S. K. Dutta, H. Paik, H. Xu, J. Matthews, R. M. Lewis, R. C. Ramos, K. Mitra, P. R. Johnson, F. W. Strauch, A. J. Dragt, C. J. Lobb, J. R. Anderson, and F. C. Wellstood, Phys. Rev. B 73, 014520 (2006)
  15. “Spectroscopic Resonance Broadening in a Josephson Junction Qubit due to Current Noise”, H. Xu, A. J. Berkley, R. C. Ramos, M. A. Gubrud, P. R. Johnson, F. W. Strauch, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, Phys. Rev. B Vol.71, 064512 (2005)
  16. “Cooper-pair Box as a Variable Capacitor” H. Paik, F. W. Strauch, R. C. Ramos, A. J. Berkely, H. Xu, S. K. Dutta, P. R. Johnson, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, IEEE Trans.  Appl. Supercond. vol. 15(2),  p. 884 (2005).
  17. “Determination of Relaxation Time of a Josephson Junction Qubit”, S. K. Dutta, H. Xu, A. J. Berkley, R. C. Ramos, M. A.Gubrud, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, Phys. Rev. B 70, 140502 (2004).
  18. “Spectroscopy of Multi-particle Entanglement in a Macroscopic Superconducting Circuit”, Huizhong Xu, Frederick W. Strauch, S. K. Dutta, Philip R. Johnson, R. C. Ramos, A. J. Berkley, H. Paik, J. R. Anderson, A. J. Dragt, C. J. Lobb, and F. C. Wellstood, Phys. Rev. Lett., 94 027003 (2005).
  19.  “Capacitively-coupled Josephson Junctions: a Two-Qubit System”, R. C. Ramos, F. W. Strauch, P. R. Johnson , A. J. Berkley, H. Xu, M. A. Gubrud, J. R. Anderson, C. J. Lobb, A. J. Dragt and F. C. Wellstood, IEEE Trans. on Appl. Supercond. 13, 994(2003).
  20. “Spectroscopy of Capacitively-coupled Josephson Junction Qubits”, P. R. Johnson, F. W. Strauch, A. J. Dragt, R. C. Ramos, C. J. Lobb, J. R. Anderson and F. C. Wellstood, Rapid Communications, Phys Rev B 67, 020509(R) (2003).
  21. “Decoherence in a Josephson Junction Qubit”, A. J. Berkley, H. Xu, R. C. Ramos, J. R. Anderson, C. J. Lobb and F. C. Wellstood, Phys Rev B 68, 060502 (2003).
  22. “Characterization of an LC-Isolated Josephson Junction Qubit”, A. J. Berkley, H. Xu, M. A. Gubrud, R. C. Ramos Jr., J. R.Anderson, C. J. Lobb, F. C. Wellstood, IEEE Trans on Appl Supercond. 13, 952 (2003).
  23.  "Response to Defining Entanglement by Antoni Wójcik," A. J. Berkley, H. Xu, R. C. Ramos, M. A. Gubrud, F. W. Strauch, P. R. Johnson, J. R. Anderson, A. J. Dragt, C. J. Lobb, and F. Wellstood, Science 301, 1183-1184 (2003).
  24. “Entangled Macroscopic Quantum States in Two Superconducting Qubits”, A. J. Berkley, H. Xu, R. C. Ramos, M. A. Gubrud, F. W. Strauch, P. R. Johnson, J. R. Anderson, A. J. Dragt, C. J. Lobb, and F. Wellstood, Science 300, 1548 (2003).
  25. “Analysis of Energy Level Quantization and Tunneling from the Zero-voltage State of a Current-biased Josephson Junction”, H. Xu,  A. J. Berkley, M. A. Gubrud, R. C. Ramos, J. R. Anderson, C. J. Lobb, and F. C. Wellstood,   IEEE Trans on Appl Supercond. 13, 956 (2003).
  26. "Josephson-junction qubits: entanglement and coherence," J. R. Anderson, A. J. Berkley, A. J. Dragt, M. A. Gubrud, P. R. Johnson, C. J. Lobb, R. C. Ramos, F. W.Strauch, F. C. Wellstood, and H. Xu, Superlattices and Microstructures 32, 231-238 (2003).
  27.  “The High-temperature Phase Diagram of Single-layer 3He-4He Mixtures”, R. C. Ramos and O. E. Vilches,  J. Low Temp Phys. Vol 134 (1-2), 55 (2003).
  28.  “Design for Effective Thermalization of Junctions for Quantum Coherence”. R. C. Ramos, M. A. Gubrud, A. J. Berkley, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, IEEE Trans. On Appl. Supercond., vol. 11, pp. 998–1001 (2001).
  29. “Measurement of Sub-gap Leakage in Nb/AlOx/Nb and Al/AlOx/Al Josephson Junctions”, M. A. Gubrud, R. C. Ramos, J. R. Anderson, C. J. Lobb and F. C. Wellstood, IEEE Trans on Appl Supercond, vol. 11, pp. 1002-1005 (2001).
  30. “Calorimetric Study of the Desorption and Phases of 3He and 4He adsorbed on two layers of H2-plated graphite above 0.2K”. R.C. Ramos,  P. Ebey and O.E. Vilches,  J. Low Temp Phys.  Vol 110, No.1/2 , p. 615-20 (1998).
  31. “Heat Capacity of Monolayer 3He adsorbed on H2 plated graphite above 0.2K”. O.E. Vilches, R. C. Ramos, D. Ritter and P. Ebey,  Czech J. of Phys Vol 46 (1998).   
  32. “Isotopic Ordering in Single-Layer Hydrogen-Deuterium Mixtures”. M. Bienfait, P. Zeppenfeld, R.C. Ramos, Jr., J.M. Gay, O.E. Vilches and G. Coddens, Phys. Rev. B 60 (16), p.11773 (1999).
  33. “Liquid-Vapor Coexistence in Two-dimensional 3He-4He Mixtures”. R.C. Ramos, Jr. and O.E. Vilches,  J. Low Temp Phys  Vol. 113, No. 5/6, pp. 981-986 (1998).
  34.  “Path Integral Formulation of Ring-Shaped Topological Defects”. R. C. Ramos, Jr., C. Bernido and M. Carpio-Bernido, J. Phys A Vol 27 No. 24  p 8251-67 (1997).
Author: Roberto Ramos
Last modified: 7/20/2017 6:25 AM (EDT)