# Daniel J. Gauthier

## Research Professor of Physics

### Overview

Prof. Gauthier is interested in a broad range of topics in the fields of nonlinear and quantum optics, and nonlinear dynamical systems.

In the area of optical physics, his group is studying the fundamental characteristics of highly nonlinear light-matter interactions at both the classical and quantum levels and is using this understanding to develop practical devices.

At the quantum level, his group has three major efforts in the area of quantum communication and networking. In one project, they are investigating hybrid quantum memories where one type of memory is connected to another through the optical field (so-called flying qubits). In particular, they are exploring nonlinear optical methods for frequency converting and impedance matching photons emitted from one type of quantum memory (e.g., trapped ions) to another (e.g., quantum dots).

In another project, they are exploring methods for efficiently transmitting a large number of bits of information per photon. They are encoding information on the various photon degrees of freedom, such as the transverse modes, one photon at a time, and using efficient mode sorters to direct the photons to single-photon detectors. The experiments make use of multi-mode spontaneous down conversion in a nonlinear crystal to produce quantum correlated or entangled photon pairs.

Another recent interest is the development of the world's most sensitive all-optical switch. Currently, they have observed switching with an energy density as low as a few hundred yoctoJoules per atomic cross-section, indicating that the switch should be able to operate at the single-photon level. The experiments use a quasi-one-dimensional ultra-cold gas of rubidium atoms as the nonlinear material. They take advantage of a one-dimensional optical lattice to greatly increase the nonlinear light-matter interaction strength.

In the area of nonlinear dynamics, his group is interested in the control and synchronization of chaotic devices, especially optical and radio-frequency electronic systems. They are developing new methods for private communication of information using chaotic carriers, using chaotic elements for distance sensing (e.g., low-probability-of-detection radar), using networks of chaotic elements for remote sensing, and using chaotic elements for generating truly random numbers at high data rates. Recently, the have observed 'Boolean chaos,' where complex behavior is observed in a small network of commercially-available free-running logic gates.

### Selected Grants

Collaborative Research: Accelerating the Pace of Research and Implementation of Writing-to-Learn Pedagogies Across STEM Disciplines awarded by National Science Foundation (Key Faculty). 2015 to 2020

Compact single-atom entanglement experiment for quantum networks awarded by Army Research Office (Principal Investigator). 2015 to 2019

Fundamental Experimental Research on the Dynamics of Physical Networks awarded by Army Research Office (Principal Investigator). 2012 to 2018

Enhancing Light-Matter Interfaces via Collective Self-Organization awarded by National Science Foundation (Principal Investigator). 2012 to 2016

Scalable Platform for Agile extended-Reach Quantum Communications (SPARQC) awarded by Defense Advanced Research Projects Agency (Co-Principal Investigator). 2012 to 2016

Synchronization of networks of coupled chaotic units awarded by US-Israel Binational Science Foundation (Principal Investigator). 2011 to 2015

Automated Micromanufacturing for Optical Sensing and Computational Imaging, Metamaterials, and Quantum Computing awarded by Air Force Office of Scientific Research (Co-Principal Investigator). 2012 to 2014

Compact single site resolution cold atom experiment for adiabatic quantum computing awarded by Army Research Office (Principal Investigator). 2012 to 2013

ARO-Network Dynamics Measurement Instrument awarded by Army Research Office (Principal Investigator). 2012 to 2013

Low-Light-Level Nonlinear Optics via Recoil-Induced Resonance awarded by National Science Foundation (Principal Investigator). 2009 to 2013

## Pages

Lukens, JM, Islam, NT, Lim, CCW, and Gauthier, DJ. "Reconfigurable generation and measurement of mutually unbiased bases for time-bin qudits." *Applied Physics Letters* 112.11 (March 12, 2018).
Full Text

Cahall, C, Nicolich, KL, Islam, NT, Lafyatis, GP, Miller, AJ, Gauthier, DJ, and Kim, J. "Multi-photon detection using a conventional superconducting nanowire single-photon detector." *Optica* 4.12 (December 20, 2017): 1534-1535.
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Islam, NT, Lim, CCW, Cahall, C, Kim, J, and Gauthier, DJ. "Provably secure and high-rate quantum key distribution with time-bin qudits." *Science advances* 3.11 (November 24, 2017): e1701491-.
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Stipčević, M, Christensen, BG, Kwiat, PG, and Gauthier, DJ. "Advanced active quenching circuit for ultra-fast quantum cryptography." *Optics Express* 25.18 (September 4, 2017): 21861-21861.
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Shea, ME, and Gauthier, DJ. "Comment on “Nondestructive light-shift measurements of single atoms in optical dipole traps”." *Physical Review A* 96.2 (August 2017).
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Islam, NT, Cahall, C, Aragoneses, A, Lezama, A, Kim, J, and Gauthier, DJ. "Robust and Stable Delay Interferometers with Application to -Dimensional Time-Frequency Quantum Key Distribution." *Physical Review Applied* 7.4 (April 2017).
Full Text

Lohmann, J, D'Huys, O, Haynes, ND, Schöll, E, and Gauthier, DJ. "Transient dynamics and their control in time-delay autonomous Boolean ring networks." *Physical review. E* 95.2-1 (February 17, 2017): 022211-.
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Brougham, T, Wildfeuer, CF, Barnett, SM, and Gauthier, DJ. "The information of high-dimensional time-bin encoded photons." *The European Physical Journal D* 70.10 (October 2016).
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Schmittberger, BL, and Gauthier, DJ. "Spontaneous emergence of free-space optical and atomic patterns." *New Journal of Physics* 18.10 (October 1, 2016): 103021-103021.
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D'Huys, O, Lohmann, J, Haynes, ND, and Gauthier, DJ. "Super-transient scaling in time-delay autonomous Boolean network motifs." *Chaos (Woodbury, N.Y.)* 26.9 (September 2016): 094810-.
Full Text

## Pages

Islam, NT, Cahall, C, Aragoneses, A, Lim, CCW, Allman, MS, Verma, V, Nam, SW, Kim, J, and Gauthier, DJ. "Discrete-variable time-frequency quantum key distribution." December 16, 2016.

Cahall, CT, Gauthier, DJ, and Kim, J. "Cryogenic amplifiers for a superconducting nanowire single photon detector system." December 16, 2016.

Stipcevic, M, Christensen, BG, Kwiat, PG, and Gauthier, DJ. "Advanced active quenching circuits for single-photon avalanche photodiodes." January 1, 2016. Full Text

Islam, NT, Cahall, C, Aragoneses, A, Lim, CCW, Allman, MS, Verma, V, Nam, SW, Kim, J, and Gauthier, DJ. "Enhancing the secure key rate in a quantum-key-distribution system using discrete-variable, high-dimensional, time-frequency states." January 1, 2016. Full Text

Baron, A, Larouche, S, Gauthier, DJ, and Smith, DR. "Scaling of the nonlinear response of metal/dielectric plasmonic waveguides." August 10, 2015.

Gauthier, DJ, and Schmittberger, BL. "Enhancing the nonlinearity at ultra-low light levels using spatial bunching of cold atoms." SPIE Photonics West. San Francisco, California. February 10, 2015.

Gauthier, DJ, Haynes, ND, Lohmann, J, D'Huys, O, and Rosin, DP. "Extreme transients in time-delay autonomous Boolean networks." Dynamics Days XXXIV. Houston, TX. January 10, 2015.

Gauthier, DJ, Haynes, ND, Soriano, MC, Rosin, DP, and Fischer, I. "Physical reservoir computing with Boolean logic." Dynamics Days XXXIV. Houston, TX. January 10, 2015.

Gauthier, DJ, Lohmann, J, Haynes, ND, D'Huys, O, and Schöll, E. "Dynamics of experimental time-delay autonomous Boolean networks." Dynamics Days XXXIV. Houston, TX. January 10, 2015.

Baron, A, Larouche, S, Gauthier, DJ, and Smith, DR. "Scaling of the nonlinear response of metal/dielectric plasmonic waveguides." January 1, 2015. Full Text