Quantum physics has led to a revolution in our conception of the nature of our world and is now bringing about a technological revolution. The use of quantum information promises indeed applications that outperform those of today’s so-called classical devices. Continuous variable quantum information theory refers to the study of quantum information encoded in continuous degrees of freedom of quantum systems. This theory extends the mathematical study of quantum information to quantum states in Hilbert spaces of infinite dimension. It offers different perspectives compared to discrete variable quantum information theory and is particularly suitable for the description of quantum states of light. Quantum optics is thus a natural experimental platform for developing quantum applications in continuous variable.
This thesis focuses on three main questions: where does a quantum advantage, that is, the ability of quantum machines to outperform classical machines, come from? How to ensure the proper functioning of a quantum machine? What advantages can be gained in practice from the use of quantum information? These three questions are at the heart of the development of future quantum technologies and we provide several answers within the frameworks of continuous variable quantum information and linear quantum optics.
Quantum advantage in continuous variable comes in particular from the use of so-called non-Gaussian quantum states. We introduce the stellar formalism to characterize these states. We then study the transition from classically simulable models to models universal for quantum computing. We show that quantum computational supremacy, the dramatic speedup of quantum computers over their classical counterparts, may be realized with non-Gaussian states and Gaussian measurements.
Quantum certification denotes the methods seeking to verify the correct functioning of a quantum machine. We consider certification of quantum states in continuous variable, introducing several protocols according to the assumptions made in the tested state. We develop efficient methods for the verification of a large class of multimode quantum states, including the output states of the Boson Sampling model, enabling the experimental verification of quantum supremacy with photonic quantum computing.
We give several new examples of practical applications of quantum information in linear quantum optics. Generalizing the swap test, we highlight a connection between the ability to distinguish two quantum states and the ability to perform universal programmable quantum measurements, for which we give various several implementations in linear optics, based on the use of single photons or coherent states. Finally, we obtain, thanks to linear optics, the first implementation of a quantum protocol for weak coin flipping, a building block for many cryptographic applications.
Defensa : 22/07/2020 - 10h00 - Visioconférence
miembros del jurado :
Andreas Winter [rapporteur]
Anthony Leverrier [rapporteur]
- U. Chabaud, P.‑E. Emériau, F. Grosshans : “Witnessing Wigner Negativity”, (2021)
- U. Chabaud, D. Markham, A. Sohbi : “Quantum machine learning with adaptive linear optics”, (2021)
- U. Chabaud : “Advantages quantiques en variable continue et applications en optique quantique”, tesis, defensa 22/07/2020, dirección de investigación Markham, Damian, rapporteurs : KASHEFI Elham (2020)
- U. Chabaud, G. Roeland, M. Walschaers, F. Grosshans, V. Parigi, D. Markham, N. Treps : “Certification of non-Gaussian states with operational measurements”, (2020)
- U. Chabaud, G. Ferrini, F. Grosshans, D. Markham : “Classical simulation of Gaussian quantum circuits with non-Gaussian input states”, (2020)
- N. Kumar, U. Chabaud, E. Kashefi, D. Markham, E. Diamanti : “Optimal quantum-programmable projective measurements with coherent states”, (2020)
- M. Bozzio, U. Chabaud, I. Kerenidis, E. Diamanti : “Quantum weak coin flipping with a single photon”, Physical Review A, vol. 102 (2), pp. 022414, (American Physical Society) (2020)
- A. Olivo, U. Chabaud, A. Chailloux, F. Grosshans : “Breaking simple quantum position verification protocols with little entanglement”, (2020)
- U. Chabaud, F. Grosshans, E. Kashefi, D. Markham : “Efficient verification of Boson Sampling”, (2020)
- J. Eisert, D. Hangleiter, N. Walk, I. Roth, D. Markham, Rh. Parekh, U. Chabaud, E. Kashefi : “Quantum certification and benchmarking”, Nature Reviews Physics, vol. 2, pp. 382-390 (2020)
- U. Chabaud, T. Douce, F. Grosshans, E. Kashefi, D. Markham : “Building trust for continuous variable quantum states”, 15th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2020), vol. 158, Leibniz International Proceedings in Informatics (LIPIcs), Riga, Latvia, pp. 3:1-3:15, (Schloss Dagstuhl--Leibniz-Zentrum für Informatik) (2020)
- U. Chabaud, D. Markham, F. Grosshans : “Stellar representation of non-Gaussian quantum states”, Physical Review Letters, (American Physical Society) (2020)
- U. Chabaud : “On the permanent of Sylvester-Hadamard matrices”, (2019)
- U. Chabaud, E. Diamanti, D. Markham, E. Kashefi, A. Joux : “Optimal quantum-programmable projective measurement with linear optics”, Physical Review A, (American Physical Society) (2018)
- U. Chabaud, T. Douce, D. Markham, P. Van Loock, E. Kashefi, G. Ferrini : “Continuous-Variable Sampling from Photon-Added or Photon-Subtracted Squeezed States”, Physical Review A, (American Physical Society) (2017)