Gerardo Suarez

Visiting the Giant Gundam in Yokohama

November, 2023

I’m a Venezuelan physicist, with passion for problem solving and software development. I’m currently pursuing a PhD at ICTQT, in the university of Gdansk.

My work focuses on the description of open quantum systems, particularly in Non-Markovian equations focusing on the Refined Weak coupling/ExpZ map/ cumulant equation for which I wrote a python package , Throughout my PhD I’ve spent a lot of time checking out and testing different techniques for the description of open systems such as HEOM, the reaction coordinate mapping, The time convolutionless equation (TCL), TEDOPA … etc. I believe this has given me a deeper insight on Open quantum systems from the point of view of where approximations fail or hold, and whether we can trust certain effects from approximate descriptions.

I was born in Maracaibo in 1996, however I grew up in Valera,Trujillo. I’m proud to call myself “Gocho”, I was a scout for about 11 years, and it shaped the person I am today, I believe I am a better person because of all the experiences and people I met in the movement over the years.

I started off my career as an electronics engineer, I later did a masters in experimental quantum optics at CINVESTAV, and now I’m pursuing a PhD in open quantum systems at ICTQT under the supervision of Michal Horodecki. I was previously an Intern at RIKEN where I worked on enhancements on the qutip HEOM package, that started me off contributing to open source which I actively try to do.

I have some experience as a python developer/data analyst on upwork, which was my focus prior to starting my PhD

In my free time I enjoy anime, cooking, video games, and trading, while I mainly avoid actively trading, I do have some fun selling some weekly covered calls once in a while.

Selected Publications

The Josephson junction as a quantum engine

Robert Alicki, Michał Horodecki, Alejandro Jenkins, and 2 more authors

New Journal of Physics, Nov 2023

Abs DOI

We treat the Cooper pairs in the superconducting electrodes of a Josephson junction (JJ) as an open system, coupled via Andreev scattering to external baths of electrons. The disequilibrium between the baths generates the direct-current bias applied to the JJ. In the weak-coupling limit we obtain a Markovian master equation that provides a simple dynamical description consistent with the main features of the JJ, including the form of the current–voltage characteristic, its hysteresis, and the appearance under periodic voltage driving of discrete Shapiro steps. For small dissipation, our model also exhibits a self-oscillation of the JJ’s electrical dipole with frequency around mean voltage V. This self-oscillation, associated with ‘hidden attractors’ of the nonlinear equations of motion, explains the observed production of monochromatic radiation with frequency Ω and its harmonics. We argue that this picture of the JJ as a quantum engine resolves open questions about the Josephson effect as an irreversible process and could open new perspectives in quantum thermodynamics and in the theory of dynamical systems.
Dynamics of the nonequilibrium spin-boson model: A benchmark of master equations and their validity

Gerardo Suárez, Marcin Łobejko, and Michał Horodecki

Phys. Rev. A, Oct 2024

DOI
Optimal quantum control of charging quantum batteries

R R Rodríguez, B Ahmadi, G Suárez, and 3 more authors

New Journal of Physics, Apr 2024

Abs DOI

Quantum control allows us to address the problem of engineering quantum dynamics for special purposes. While recently the field of quantum batteries has attracted much attention, optimization of their charging has not benefited from the quantum control methods. Here we fill this gap by using an optimization method. We apply for the first time the convergent iterative method for the control of the population of a bipartite quantum system in two cases, starting with a qubit-qubit case. The quantum charger-battery system is considered here, where the energy is pumped into the charger by an external classical electromagnetic field. Secondly, we systematically extend our investigation to a second case involving two harmonic oscillators in the Gaussian regime, presenting an original formulation of the method. In both cases, the charger is considered to be an open dissipative system, as its interaction with the drive may require a more pronounced exposure to general interaction with environment. A key consideration in our optimization strategy is the practical concern of turning the charging external field on and off. We find that optimizing the pulse shape yields a substantial enhancement in both the power and efficiency of the charging process compared to a sinusoidal drive. The harmonic oscillator configuration of quantum batteries is particularly intriguing, as the optimal driving pulse remains effective regardless of the environmental temperature. This study introduces a novel approach to quantum battery charging optimization, opening avenues for enhanced performance in real-world applications.