Congratulations to New ICFO PhD Graduate

We congratulate Dr. Adriano Macarone Palmieri who defended his thesis this morning in ICFO’s Auditorium.

Dr. Macarone Palmieri obtained his MSc in Applied Physics at the Università di Bologna, in Italy before joining the Quantum Optics Theory research group led by ICREA professor at ICFO Dr. Maciej Lewenstein.  His thesis titled “Deep learning for boosted quantumstate estimation and bath parameterextraction” was supervised by Prof. Maciej Lewenstein.

ABSTRACT:

The thesis explores the application of supervised deep learning (DL) to mitigate noise in quantum state estimation protocols, to offer a viable tool for quantum technologies development, that leverages quantum properties, like entanglement. This is vital for quantum information processing and is used in applications like quantum teleportation, quantum key distribution, and superdense coding. However, the practical implementation of these technologies is challenged by noise and errors, making accurate certification of quantum states essential.

Traditionally, state tomography is the best possible desiderata, but it is resource-intensive. Alternative methods with better scaling, such as permutationally invariant states and shadows, have been proposed, though they are limited in scope, because limited to specific classes of states or can estimate some quantum properties only. The thesis specifically investigates whether supervised DL can be used to mitigate noise and achieve full quantum state estimation under various conditions, including limited resources, different noisy sources, and, last, incomplete information.

The research introduces a novel approach using the out-of-distribution paradigm to extend the applicability of supervised deep learning to unknown data distributions, such as noisy quantum states measured with imperfect setups. This study at a higher depth the generalization ability of deep learning protocols while maintaining the simplicity of trained supervised neural networks. In this way, seamless application from synthetic to experimental data is allowed. At the same time, the computational aspect involves analyzing the complexity of different models and their learning abilities, and noise mitigation capabilities, and showcasing transformer-based models in certifying genuine k-body entanglement as superior.

Lastly, the thesis addresses noise characterization using deep learning, particularly how this can infer environmental noise parameters from a single-qubit probe without fixed-time conditions. This contributes to better noise reduction and system control in quantum technologies.

Thesis Committee:

Prof. Dr. Thi Ha Kyav, LG ELECTRONICS TORONTO AL LAB

Prof. Dr. Nicoletta Liguori, ICFO

Dr. Nicola Garzaniti, CRANFIELD