Research interests

My current research interests include:

Error correction for physically realistic noise models
Machine learning for quantum inference
Quantum measurement theory
Geometric properties of quantum state space
Open-quantum-system dynamics (particularly stochastic evolution)
Quantum-state tomography

My various research profiles are:

Papers

Fast and differentiable simulation of driven quantum systems
Ross Shillito, JAG, Agustin Di Paolo, Élie Genois, and Alexandre Blais
Phys. Rev. Research 3, 033266 (2021), DOI:10.1103/PhysRevResearch.3.033266,
arXiv:2012.09282
Designing codes around interactions: The case of a spin
JAG
Phys. Rev. Lett. 127, 010504 (2021), DOI:10.1103/PhysRevLett.127.010504,
Published PDF, Preprint: Encoding a qubit in a spin, arXiv:2005.10910
Collisional picture of quantum optics with giant emitters
Dario Cilluffo, Angelo Carollo, Salvatore Lorenzo, JAG, G. Massimo Palma, and Francesco Ciccarello Phys. Rev. Research 2, 043070 (2020), DOI:10.1103/PhysRevResearch.2.043070,
arXiv:2006.08631
One from many: Estimating a function of many parameters
JAG and Carlton M. Caves
J. Phys. A: Math. Theor. 54 014001 (2020), DOI:10.1088/1751-8121/abb9ed, arXiv:2002.02898
Bias-preserving gates with stabilized cat qubits
Shruti Puri, Lucas St-Jean, JAG, Alexander Grimm, N. E. Frattini, Pavithran S. Iyer, Anirudh Krishna, Steven Touzard, Liang Jiang, Alexandre Blais, Steven T. Flammia, and S. M. Girvin
Science Advances Vol. 6, no. 34, eaay5901 (2020), DOI:10.1126/sciadv.aay5901, arXiv:1905.00450
Optimal and secure measurement protocols for quantum sensor networks
Zachary Eldredge, Michael Foss-Feig, JAG, S. L. Rolston, and Alexey V. Gorshkov
Phys. Rev. A 97, 042337 (2018), DOI:10.1103/PhysRevA.97.042337,
Published PDF, arXiv:1607.04646
Qubit models of weak continuous measurements: Markovian conditional and open-system dynamics
JAG, Carlton M. Caves, Gerard J. Milburn, and Joshua Combes
Quantum Sci. Technol. 3 024005 (2018), DOI:10.1088/2058-9565/aaa39f,
Published PDF, arXiv:1710.09523
QInfer: Statistical inference software for quantum applications
Christopher Granade, Christopher Ferrie, Ian Hincks, Steven Casagrande, Thomas Alexander, JAG, Michal Kononenko, and Yuval Sanders
Quantum 1, 5 (2017), DOI:10.22331/q-2017-04-25-5, arXiv:1610.00336
Fisher-symmetric informationally complete measurements for pure states
Nan Li, Christopher Ferrie, JAG, Amir Kalev, and Carlton M. Caves
Phys. Rev. Lett. 116, 180402 (2016), DOI:10.1103/PhysRevLett.116.180402,
Published PDF, arXiv:1507.06904
Novelty, efficacy, and significance of weak measurements for quantum tomography
JAG, Ninnat Dangniam, Christopher Ferrie, and Carlton M. Caves
Phys. Rev. A 92, 062133 (2015), DOI:10.1103/PhysRevA.92.062133,
Published PDF, arXiv:1506.08892

Talks

Presented

Here is a list of talks I have given or am scheduled to give. I provide them in two formats: browsercast (which plays the audio back in sync with the slideshow in your browser) or slides only (which allows you to view the HTML slides at your own pace in your browser).

If you are watching a browsercast and the play/pause button is not responding to clicks, the spacebar works to pause or resume playback (I may have messed something up when playing with the CSS…)

Some of my slides also use MathML for equations, which looks great in Firefox but doesn’t have good support in Chrome (although I just started playing around with the Math anywhere Chrome extension, which does a decent job).

GKP-inspired quantum error-correcting codes, Byron Bay Quantum Workshop, Byron Bay, NSW, November 27, 2019
One from many: Scalar estimation in a multiparameter context, University of Sydney, November 15, 2019
One from many: Scalar estimation in a multiparameter context, University of Palermo, July 31, 2019
One from many: Scalar estimation in a multiparameter context, 2019 APS March Meeting, Boston, MA, March 7, 2019 (abstract: K28.00012, slides)
Systems illuminated by squeezed wave-packet modes, Fall 2018 INTRIQ Meeting, Bromont, QC, November 14, 2018
Caution! Sharp edges of quantum state space, UC Berkeley, Berkeley, CA, March 14, 2018
On Pins and Needles: The Geometry of Quantum Measurements, 2018 APS March Meeting, Los Angeles, CA, March 7, 2018 (abstract: L28.00013, slides)
Caution! Sharp edges of quantum state space, Université de Sherbrooke, Sherbrooke, QC, January 31, 2018 (abstract)
Digital noise: Qubit models of weak continuous measurements, Griffith University, Brisbane, QLD, December 4, 2017
Quantum tomography: where are the spherical cows?, University of Queensland, Brisbane, QLD, November 7, 2017
Rank deficiency and the Euclidean geometry of quantum states, 2017 APS March Meeting, New Orleans, LA, March 13, 2017 (abstract: A52.00002)
Rank deficiency and the Euclidean geometry of quantum states, CQuIC internal talk, Albuquerque, NM, October 26, 2016 (browsercast)
Fisher symmetry and the geometry of quantum states, University of Sydney, Sydney, NSW, May 12, 2016 (slides)
Fisher symmetry and the geometry of quantum states, 2016 APS March Meeting, Baltimore, MD, March 16, 2016 (abstract: L44.00012, slides)
Fisher symmetry and the geometry of quantum states, 18th annual SQuInT workshop, Albuquerque, NM, February 19, 2016 (abstract: 9c, 4:30–5pm, slides)
Fisher symmetry and the geometry of quantum states, CQuIC internal talk, Albuquerque, NM, September 16, 2015 (browsercast)
On the efficacy of weak measurement tomography, 2015 APS March Meeting, San Antonio, TX, March 4, 2015 (abstract: M38.00004, browsercast)
On the efficacy of weak measurement tomography, 17th annual SQuInT workshop, Berkeley, CA, February 20, 2015 (browsercast, slides)

Affiliated

Here are talks that I have not personally given, but are based on projects in which I am heavily involved.

Quantum-tailored machine-learning architectures
Élie Genois, Agustin Di Paolo, Alexandre Blais, JAG
2020 APS March Meeting, Denver, CO, March 2, 2020, A17.00011

Posters

Rank deficiency and the Euclidean geometry of quantum states, 19th annual SQuInT workshop, Baton Rouge, LA, February 23, 2017 (abstract, web formatted)