headshot photo of Dr. Justin Dressel

Dr. Justin Dressel

Associate Professor, Program Director for the Faculty of Physics
Schmid College of Science and Technology; Physics
Office Location: Keck Center for Science and Engineering 353
Phone: (714) 516-5949
Scholarly Works:
Digital Commons
University of Rochester, Master of Arts
University of Rochester, Ph.D.

Video Profile


Research Interests

Dr. Dressel researches the foundations of quantum physics, which is a natural intersection point between physics, mathematics, and computer science. His recent research has focused on algebraic approaches to generalized quantum measurements, quantum computation with superconducting transmon quantum bits using circuit quantum electrodynamics, and Clifford algebraic approaches to relativistic field theory. Though the bulk of his work is theoretical in nature, he works closely with experimental teams at U Rochester, UC Berkeley, and UC Santa Barbara.

Modern experimental techniques have enabled the unprecedented control of quantum systems, which has fueled Dr. Dressel's interest in experimentally-grounded foundational questions. He has been particularly interested in the implementation and applications of generalized quantum measurements, including so-called "weak measurements." A typical laboratory measuring device couples indirectly to quantum systems of interest, and thus collects only imperfectly correlated information. Such a noisy measurement only partially collapses the quantum state. Sufficiently weak coupling even permits individual measurements to leave the quantum state nearly unperturbed while still extracting useful information on average after many repeated trials. If one monitors a quantum system continuously using such a weakly coupled meter, one obtains stochastic quantum state trajectories that exhibit competition between the natural dynamics and the measurement collapse. Recently, these quantum trajectories have been experimentally verified as part of the ongoing effort to build a working quantum computer, where they arise naturally during the measurement of superconducting quantum bits using microwave fields.

Research Group

Dr. Dressel enjoys collaborating with colleagues from a variety of disciplines, including ambitious undergraduate students who are eager to perform original research. His research group currently consists of one graduate student in the Computational and Data Sciences (CADS) program (Shiva Lotfallahzadeh Barzili), and one postdoctoral scholar (Luis Pedro Garcia-Pintos).

Selected Recent Publications

Preserving entanglement during weak measurement demonstrated with a violation of the Bell-Leggett-Garg inequality
Nature Partner Journals: Quantum Information 2, 15022 (2016)
T. C. White, J. Y. Mutus, J. Dressel, J. Kelly, R. Barends, E. Jeffrey, D. Sank, A. Megrant, B. Campbell, Y. Chen, Z. Chen, B. Chiaro, A. Dunsworth, I.-C. Hoi, C. Neill, P. J. J. O'Malley, P. Roushan, A. Vainsencher, J. Wenner, A. N. Korotkov, and J. M. Martinis

Measuring a transmon qubit in circuit QED: dressed squeezed states
Physical Review A 94, 012347 (2016)
M. Khezri, E. Mlinar, J. Dressel, and A. N. Korotkov

Power-recycled weak-value-based metrology
Physical Review Letters 114, 170801 (2015)
K. Lyons, J. Dressel, A. N. Jordan, J. C. Howell, and P. G. Kwiat

Spacetime algebra as a powerful tool for electromagnetism
Physics Reports 589, 1-72 (2015)
J. Dressel, K. Y. Bliokh, and F. Nori

Mapping the optimal route between two quantum states
Nature 511, 570-573 (2014)
S. J. Weber, A. Chantasri, J. Dressel, A. N. Jordan, K. W. Murch, and I. Siddiqi

Classical Field Approach to Quantum Weak Measurements
Physical Review Letters 112, 110407 (2014)
J. Dressel, K. Y. Bliokh, and F. Nori

Colloquium: Understanding Quantum Weak Values: Basics and Applications
Reviews of Modern Physics 112, 110407 (2014)
J. Dressel, M. Malik, F. M. Miatto, A. N. Jordan, and R. W. Boyd

Quantum instruments as a foundation for both states and observables
Physical Review A 88, 022107 (2013)
J. Dressel and A. N. Jordan


CS 510 (Fall 2015, Fall 2016)
PHYS 101 (Spring 2017)
PHYS 107 (Fall 2015)
PHYS 227 (Spring 2016)
PHYS 220 (Fall 2016)
PHYS 321 (Spring 2016)
PHYS 340 (Spring 2017)
PHYS 451 (Fall 2015)

Recent Creative, Scholarly Work and Publications