## Permanent members

**Eleni Diamanti**

Theoretical and experimental quantum cryptography, continuous-variable quantum key distribution, entangled resources for quantum communication networks.

Personal page here.

**Elham Kashefi**

Verification of quantum technology, quantum interactive proof systems, delegated quantum computing, secure multi-party computing, experimental implementation of quantum protocols, quantum parallel computing, new models for quantum computing.

Personal page here.

**Damian Markham**

Quantum computation and information, quantum network protocols, entanglement, foundations of quantum information.

Personal page here.

**Frédéric Grosshans**

Quantum cryptography, relativistic cryptography, quantum networks, quantum continuous variables.

Personal page here.

**Alex Bredariol Grilo**

Quantum/classical complexity theory, (theoretical) quantum cryptography, quantum interactive proof systems, Hamiltonian complexity, quantum learning theory.

Personal page here.

## Researchers on secondment

**Harold Ollivier**

Quantum error correcting codes, quantum cryptography and quantum networks.

Personal page here.

## Post-docs

I am interested in the effects of atmospheric turbulence on quantum communication. My work is focused on the evaluation of its impact on continuous-variable quantum-key-distribution (CV-QKD), studying in particular the satellite-to-ground channel. The goal of the project is to understand if this technology is well suited for space applications, which represent a fundamental step towards the extension of quantum communication to a global level.

**Matteo Schiavon**I am interested in the effects of atmospheric turbulence on quantum communication. My work is focused on the evaluation of its impact on continuous-variable quantum-key-distribution (CV-QKD), studying in particular the satellite-to-ground channel. The goal of the project is to understand if this technology is well suited for space applications, which represent a fundamental step towards the extension of quantum communication to a global level.

**Giacomo Sorelli**

I have been working on the entanglement of spatial modes of light, with a particular focus on orbital-angular-momentum carrying modes, and their stability under deterministic as well as random perturbations, such as atmospheric turbulence. I am now part of a multidisciplinary team bringing together people from LKB, LIP6 and Onera to understand the role of entanglement in remote sensing applications both in the optical (LIDAR) and the microwave (RADAR) regimes.

Ivan Supic I mostly work on the verification and quantification of non-classical resources. Among many different quantum resources, I am particularly interested in different types of nonlocality and quantum incompatibility. Furthermore, I am interested in the way geometry influences nonlocal effects, particularly in quantum networks, and different ways to use such effects in quantum information processing protocols. |

## PHD Students

**Luka Music**

Quantum cryptography, secure multiparty quantum computing.

**Victor Roman Rodriguez**

I am interested in the experimental realization of Quantum Communications in space. In particular, I work with Continuous Variables Quantum Key Distribution (CVQKD) and my PhD is also funded by Thales Alenia Space for the use of the cryptographic protocols using satellites. In parallel, I am also investigating the creation of novel quantum states of light with properties that can be potentially applied in a broader area of quantum information protocols as well as in quantum computing.

**Pierre-Emmanuel Emeriau**

I am broadly interested in identifying and understanding quantum advantages over classical computation - specifically related to contextuality - arising in quantum systems. More precisely, my work focuses on a new version of contextuality introduced by Shane Mansfield which provides new frameworks for witnessing quantum advantages.

**Simon Neves**

My project focuses mostly on experimental photonic implementation of Quantum Cryptography and Communication protocols. These protocols are based on single or entangled photons, such as Authenticated Quantum Teleportation, Anonymous Transmission or Weak Coin Flipping. I am also interested in related topics, such as Self-Testing of Entangled States and Measurements, Quantum State Tomography, or second order Nonlinear Optics.

**Robert Ivan Booth**

I am interested in mathematical frameworks for quantum computation in atypical Hilbert spaces such as those which arise as spaces of functions over groups. I study gate models as well as MBQC protocols for (some of) these spaces and the algebraic problems that arise therein. I also have a soft spot for categorical methods in quantum mechanics and would like to see if graphical languages similar to the ZX-calculus can be defined in some of these spaces. My current work focuses on continuous variables quantum computation as a base case for these kinds of constructions.

**Federico Centrone**

My research interests are mostly concerned in applications of quantum mechanics from a theoretical and computational point of view, although I wish to be involved in their physical and experimental realizations.. Nonetheless, I am also interested in the foundations of the theory, the emergence of classicality and complexity from elementary quantum systems.

**Clément Meignant**

My research aims to address the question: 'How can one distribute quantum resources over quantum

networks?’. This topic led me to work on different domains such as the routing of classical and quantum information, state conversion protocol under LOCC (Local Operation and Classical Communication) and graph theory.

Currently, I research actively the use of quantum networks to share multipartite resources such as multipartite entangled states or multiple bipartite entangled states on different kind of networks.

**Léo Colisson**

**Nathan Shettell**

I am working on various aspects concerning quantum metrology and quantum sensing. Currently, I am exploring two different areas. The first is applications of quantum sensing such as synchronized atomic clocks and gravimeters. The latter is building a bridge between quantum metrology and other (relevant) areas of quantum information.

**Raja Yehia**

I'm working on abstract cryptography, modeling of quantum communication and computation protocols and more broadly on finding and analysing applications for the Quantum Internet.

**Dominik Leichtle**

I am broadly interested in the areas of Quantum and Post-Quantum Cryptography. Most of my current research evolves around protocols aiming to secure Delegated Quantum Computing, including the Verification of Quantum Computing.

**Damien Fruleux**

In this doctoral project, we propose to address the many challenges that are found on the way to the development of advanced cost-effective telecom network integrated CV-QKD systems that are ready to operate in a deployed optical fibre environment. These include the conception and implementation of solutions for a system operation in the so-called local Local Oscillator configuration, with suitable modulation schemes (and associated security proofs), as well as with adapted high-speed electronics. The thesis work will also include the characterization of photonic integrated CV-QKD transmitter and receiver chips on both the silicon and indium phosphide platforms, and their use for secret key generation. This will be crucial for future scalable solutions for QKD systems.

**Yao Ma**

My thesis is about the hardware secure enclave for quantum cryptography. The work could be devided into 3 steps generally. Firstly is to understand the possibility to remotely and securely control the various operations of a quantum communication protocol using classical hardware enclave, where these controls are with the analog and digital interfaces. Secondly is to define a Q enclave, which could execute the quantum operation based on the superposition inputs. Finally I will try to use secure hardware enclaves to improve the security or efficiency of quantum communication protocols.

**Armando Angrisani**

My goal is to design effective quantum machine learning algorithms for Noisy Intermediate-Scale Quantum (NISQ) devices. This task posed challenging questions in quantum complexity and statistical learning theory, as we wish to prove a quantum advantage both in terms of time and sample complexity. Moreover, I am interested in secure delegation protocol for machine learning algorithms. NISQ devices will be remotely available to clients, thus privacy-preserving delegation protocols are crucial when the input contains personal (e.g. biometric) information. I am interested as well in classical machine learning problems, such as clustering and generative modelling.

**Valentina Marulanda Acosta**

Quantum key distribution allows two parties to share a secret key that can be subsequently used to encrypt their data transfer. QKD employs the particularities of quantum mechanics in order to obtain security levels not achievable by using purely classical means. Continuous variable QKD has the advantage of encoding the key bits into the quadratures of a field instead of using the polarization of single photons which makes it possible to implement it with the aid of already existing transmitter/receiver telecom technologies. However, the distances covered by terrestrial QKD links is limited by the attenuation of optical fiber. Classical repeaters cannot be used and quantum repeaters are complex devices which is why a satellite relay can be an apealing solution for intercontinental links. Atmospheric turbulence can degrade the propagating signal which is why correction through adaptive optics is going to be considered.

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**Paul Hermouet**

Study of cryptographic quantum protocols. Evaluating security of these protocols through developing new security models, writing security proofs and studying their composability.

Development of quantum protocols libraries. Optimisation of quantum resources needed to efficiently implement these protocols.

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**Uta Isabella Meyer**

I study quantum networks with respect to multipartite entanglement and computational quantum advantage.

**Verena Yacoub**

Photonics experiments aimed to study the quantum advantage in different communication and computation tasks.

## OTHER MEMBERS

**Alisa Russanova -**Group Project Manager

I joined the group in July 2019 to assist the team on coordination and oversight of research projects as well as administrating grants, organising meetings and events, communications and administrative support to the projects.

I manage and track budgets & resources as well as accompanying members of the team with the HR procedures amongst other operations. I liaise with partners affiliated to the projects.

Broadly interested in Quantum Cryptography, I am currently working on Continuous Variable Quantum Key Distribution (CVQKD). This includes understanding the protocols and the security proofs but also characterizing the transmitter's and receiver's components and evaluating performances. The issue of deploying the system on real fiber networks is also addressed.

**Rhea Parekh**

Protocol Zoo

**Shraddha Singh**

Protocol Zoo

**Natansh Mathur**

Primarily interested in Quantum Communications and Algorithms. I contributed to the development of the Protocol Zoo. Undergraduate student in Computer Science and Engineering.

**G**özde Üstün

I am an intern creating code for quantum internet protocols in the Quantum Protocol Zoo’s Protocol Library, using Simulaqron and CQC. You can check over the codes of quantum internet protocols from my github page. I am also finding the missing points and bugs of the library and creating a library of utility functions on top of CQC.

## Alumni

**Shouvik Ghorai**

Thesis on the study and analysis of two quantum cryptographic protocols: quantum key distribution (QKD) and unforgeable quantum money in the continuous-variable (CV) framework. One of the pressing questions in CV-QKD was establishing security for two-way QKD protocols against general attacks. Quantum money exploits the no-cloning property of quantum mechanics to generate unforgeable tokens, banknotes, and credit cards. We propose a continuous-variable private-key quantum money scheme with classical verification. The motivation behind this protocol is to facilitate the process of practical implementation. Previous classical verification money schemes use single-photon detectors for verification, while our protocols require coherent detection.

**Rawad Mezher**

I am working on developing sources for pseudorandom unitaries which provably mimic genuinely (Haar) random unitaries up to a certain precision. My goal is to generate there pseudorandom unitaries in the framework of MBQC in the simplest way possible. I also aim at studying applications of these unitaries to various fields such as cryptography, thermodynamics and black hole physics.

**Niraj Kumar**

I am working on quantifying resources for quantum communication protocols (Equality, Euclidean Distance, Hidden matching to name a few) and drawing a comparison with their classical analogue. The work also involves experimental implementation to try to demonstrate quantum superiority. My other interests include quantum games, complexity.

Personal page here.

**Ulysse Chabaud**

I am working on various topics related to quantum computational supremacy. I investigate the necessary ressources for quantum advantage and how it translates to foundational questions, in the context of continuous variable quantum computational models in particular. I am also developing quantum information processing applications using linear optics.

**Mathieu Bozzio**

I am currently looking into improving quantum money protocols' practicality and providing the first experimental demonstration of an "on-the-fly" quantum credit card. The implementation and security proof takes into account the characteristics of quantum memories, and the next step is to investigate how this setup can be coupled to a state-of-the art quantum memory.

**Francesco Arzani**

My work has mostly been devoted to quantum information processing with systems described by infinite-dimensional Hilbert spaces, also known as continuous-variable systems. In particular, I am interested in the realisation of quantum computation and communication protocols with existing technology, especially in the quantum optics setting.

**Cyril Castagnet**

Web Developper. I joined the group in September 2019 to improve the Wiki protocol zoo and review the protocols existing code . The task requires to understand quantum algorithms to create a full simulation library with atomic functions, using mostly SimulaQron.

**Tom Douce**

Broadly speaking, I work on Continuous Variables quantum computing. I try to identify the non-classical resources that lead to quantum advantages. I also wish to establish connections between physical models and computer science tools.

I am interested in the application of structural and logical methods from mathematics and theoretical computer science to physics. Much of my work focusses on behaviours which are available to quantum systems but provably unachievable with classical systems such as nonlocality, contextuality and ψ-ontology. I am particularly concerned with developing general approaches to treating these phenomena and understanding how to systematically exploit them to obtain advantages over classical systems in information theoretic tasks, computational power, security or otherwise.

Personal page here.

**Shane Mansfield**I am interested in the application of structural and logical methods from mathematics and theoretical computer science to physics. Much of my work focusses on behaviours which are available to quantum systems but provably unachievable with classical systems such as nonlocality, contextuality and ψ-ontology. I am particularly concerned with developing general approaches to treating these phenomena and understanding how to systematically exploit them to obtain advantages over classical systems in information theoretic tasks, computational power, security or otherwise.

Personal page here.

**Adrien Cavailles**

I am focused on the experimental implementation of continuous-variable quantum key distribution and in particular its adaptation to the continuous-wave methods of classical telecom systems in order to reach higher transmission rates. I also work on the establishement of the Ile-de-France testbed for quantum secure communications which aims to link universities with a focus on interoperability of systems. Currently at its early stages, this testbed will be used to test different QKD systems, both commercial and lab-specific in CV and DV as well as multiplexing with classical signals.

**Adeline Orieux**

I am work on several discrete-variable quantum optics experiments at Telecom wavelength, spanning from photon-pair sources developpement to quantum cryptography protocols and communication complexity protocols.

CV-QKD has been my main subject of research during the last years, focusing mainly on practical implementation aspects. My main task is to improve the previous proof-of-principle CV-QKD prototypes to setups in consonance with current classical coherent optical communication systems, providing important advantages in terms of performance, deployment and cost. A second objective of my research is to study the performance of integrated devices in CV-QKD and, in a more theoretical approach, their performance in satellite scenarios.

**Luis Trigo Vidarte**CV-QKD has been my main subject of research during the last years, focusing mainly on practical implementation aspects. My main task is to improve the previous proof-of-principle CV-QKD prototypes to setups in consonance with current classical coherent optical communication systems, providing important advantages in terms of performance, deployment and cost. A second objective of my research is to study the performance of integrated devices in CV-QKD and, in a more theoretical approach, their performance in satellite scenarios.

**Leonardo DiSilvestro**