Resources in quantum computation for discrete and continuous-variable systems
Doctoral thesis, 2024

The evolution of information technology has reached a pivotal point with the emergence of quantum technology, promising unparalleled computational power and problem-solving capabilities. Quantum computing, based on discrete and continuous variables, promises the potential to solve computationally intractable problems efficiently. While discrete-variable quantum computing relies on qudits encoded in finite-dimensional Hilbert spaces, continuous-variable quantum computing exploits infinite-dimensional Hilbert spaces of harmonic oscillators. Both paradigms face challenges in achieving universality and fault tolerance, necessitating the exploration of resource theories such as non-Gaussianity and magic.

This thesis studies the resources for quantum computing for both discrete and continuous-variable systems and contributes to advancing our understanding of the resources essential for realizing the potential of quantum computing across different architectures.
We investigate the interplay between these resource theories, proposing novel quantifiers and establishing connections between discrete and continuous-variable quantum computing.

resource theory of non-Gaussianity

resource theory of magic

continuous variables

Quantum computing

Gottesman-Kitaev-Preskill code

discrete variables

quantum resource theory

PJ-salen
Opponent: Gerardo Adesso, University of Nottingham, UK

Author

Oliver Hahn

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Hahn,O. Ferrini, G. Takagi, R. Bridging non-Gaussian and magic resources via Gottesman-Kitaev-Preskill encoding


In our ever-connected world, information technology has woven itself into the fabric of our daily life. But as we peer into the horizon of the digital age, the landscape of computing is on the brink of a monumental shift.
Unprecedented advances in the ability to control and harness genuine quantum effects opened the possibility to use quantum phenomena in technology.
Quantum computing employs quantum effects to open doors to solutions previously deemed impossible.


At its core, quantum computing operates on two paradigms: discrete variables and continuous variables. In the discrete realm, information is encoded into qudits, which are just quantum mechanical $d$-level systems, the quantum analogy of $d$-level classical bits. Meanwhile, continuous-variable quantum computing explores the infinite-dimensional spaces of harmonic oscillators, showing great noise resilience due to the inherent redundancy.
Both promise to unlock unprecedented computational power, from cracking cryptographic codes to revolutionizing material science.

Quantum systems are notoriously delicate, prone to errors and disruptions from their noisy environments necessitating the development of fault-tolerant architectures and error correction codes. Physical real world implementations of such architectures have limitations on what operations can be performed in an error resilient way.
Here, the concept of resource theories becomes a guiding light in understanding and harnessing the fundamental building blocks of quantum computation.

In this thesis, we delve into the fascinating world of non-Gaussianity and magic, two fundamental resources that underpin the power of quantum computing.
We investigate the conversion of resourceful states in the realm of continuous variables and uncover the intricate connection between resources for discrete and continuous-variable quantum computing.

Subject Categories

Computational Mathematics

Other Physics Topics

Condensed Matter Physics

ISBN

978-91-8103-059-4

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5517

Publisher

Chalmers

PJ-salen

Online

Opponent: Gerardo Adesso, University of Nottingham, UK

More information

Latest update

5/17/2024