Julio R. Gea-Banacloche

Julio R. Gea-Banacloche


J. William Fulbright College of Arts & Sciences


Phone: 479-575-7240

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Julio Gea-Banacloche got his Ph.D. at the University of New Mexico working on the quantum theory of the free-electron laser under Marlan O. Scully.  He was a postdoctoral fellow at the University of New Mexico and the Max-Planck Institute for Quantum Optics.  He joined the Physics Department at the University of Arkansas in 1990.  He has done theoretical work in laser physics, quantum optics, and quantum information.  He served as Associate Editor of Physical Review A from 2000-2012, and was made a Fellow of the American Physical Society in 2005.  He served as Department Chair from  2011-2017.

My current research interests are primarily on the applications of quantum optical systems to quantum information processing.  In particular, for the past few years I have been studying various schemes to engineer an effective nonlinear interaction between single-photon wavepackets that would be sufficiently strong to perform a conditional phase gate with high fidelity. Such a system could be extremely useful for quantum computing (or, more generally, quantum information processing) with photonic qubits.

Besides this, my main contribution to this field has been a study of the minimum energy requirements for quantum information processing.  This started with the observation that the quantum mechanical nature of the fields used to manipulate the quantum information carriers (atoms, ions, spins…) might lead, through entanglement, to unpredictable errors in the performance of the quantum logical operations, and that the lower bound on the size of these errors is typically inversely proportional to the energy of the control system.

Past research interests include the applications of (and departures from) semiclassical approximations in quantum optics, and quantum mechanics in general; electromagnetically-induced transparency in atomic vapors; and applications of squeezed states of the electromagnetic field to various systems of interest, including gravitational-wave detection.   

Over the years I have taught a variety of courses at both the graduate and undergraduate levels.  Since 2014, I have become particularly involved in the teaching of "University Physics I"—the first semester in the calculus-based introductory physics sequence, devoted to classical mechanics.  Most recently, with the help of a grant from the University of Arkansas Libraries to develop Open-Source Educational Resources, I have written a complete textbook for the course, to be made available online, free of charge, to the students (and to anybody else who might be interested).  The textbook was first field-tested in the fall of 2018.  

Future work will involve rewriting portions of the text to address students' criticisms, developing more homework problems and worked-out examples, and continuing developing of the associated lab activities.  Eventually I would like to extend some of these efforts to the second semester course (electromagnetism and optics) as well.

Nonlinear Optics

Quantum Optics

Modern Physics

Quantum Mechanics (both graduate and undergraduate)

University Physics I





Ph.D., University of New Mexico, 1985

Publications in refereed journals over the past three years (see CV for complete list):

1.    “Analytical results for a conditional phase shift between single-photon pulses in a nonlocal nonlinear medium”, Balakrishnan Viswanathan and Julio Gea-Banacloche, Phys. Rev. A 97, 032314 (2018).

2.     “One- and two-photon scattering by two atoms in a waveguide,” William Konyk and Julio Gea-Banacloche, Phys. Rev. A 96, 063826 (2017).

3.     “Two-level-atom excitation probability for single- and N-photon wave packets,” Hemlin Swaran Rag and Julio Gea-Banacloche, Phys. Rev. A 96, 033817 (2017).

4.     “Quantum multimode treatment of light scattering by an atom in a waveguide,” William Konyk and Julio Gea-Banacloche, Phys. Rev. A 93, 063807 (2016)

5.     “Two photons co- and counterpropagating through N cross-Kerr sites,” Daniel J. Brod, Joshua Combes, and Julio Gea-Banacloche, Phys. Rev. A 94, 023833 (2016)

6.     “Multimode analysis of a conditional phase gate based on second-order nonlinearity,” Balakrishnan Viswanathan and Julio Gea-Banacloche, Phys. Rev. A 92, 042330 (2015).

7.    “Wavefunction exchange and entanglement in one-dimensional collisions,” Hemlin Swaran Rag and Julio Gea-Banacloche, Am. J. Phys. 83, 305 (2015).

July 2011–July 2017: Chair, Department of Physics, University of Arkansas, Fayetteville 

August 2000–: Professor (Physics),  University of Arkansas, Fayetteville.  

August 1994–July 2000:  Associate Professor (Physics), University of Arkansas, Fayetteville.  

January 1990–June 1994:  Assistant Professor (Physics), University of Arkansas, Fayetteville.  

May 1988–Dec. 1990:  Staff Researcher, Instituto de Optica, Consejo Superior de Investigaciones Científicas, Madrid (Spain).  

August 1987–May 1988:  Visiting Assistant Professor, Miami University, Oxford, Ohio.

June 1986—August 1987:  Visiting Scientific Collaborator at the Max-Planck Institut für Quantenoptik, Munich.

January 1985—May 1986:  Research Associate at the Center for Advanced Studies, University of New Mexico

Fellow of the American Physical Society

Associate Editor Physical Review A (2000-2012)

Ph.D., University of New Mexico, 1985

Research Associate, Max Planck Institute for Quantum Optics, 1985-87

Staff Scientist, Instituto de Optica, Madrid, Spain, 1988-90

Assistant Professor to Professor, University of Arkansas, 1990-present