Certification of quantum technologies

Projektinformationen

CERQUTE

ID Finanzhilfevereinbarung: 834266

DOI

10.3030/834266

Projekt abgeschlossen

EK-Unterschriftsdatum 26 April 2019

Startdatum 1 Januar 2020

Enddatum 31 Dezember 2025

Finanziert unter

• EXCELLENT SCIENCE - European Research Council (ERC)

Gesamtkosten

€ 1 735 043,75

EU-Beitrag

€ 1 735 043,75

Koordiniert durch

FUNDACIO INSTITUT DE CIENCIES FOTONIQUES
Spain

Periodic Reporting for period 4 - CERQUTE (Certification of quantum technologies)

Berichtszeitraum: 2024-07-01 bis 2025-12-31

Zusammenfassung vom Kontext und den Gesamtzielen des Projekts

In recent years, quantum information technologies are rapidly advancing and moving from the labs to commercial applications. This opens new challenges, as one needs to certify using our current limited classical tools that these powerful quantum devices with no classical analogue behave as expected. The concept of quantum certification addresses this question and, given a quantum system, typical questions it considers are: (i) is the system entangled or Bell nonlocal? (ii) does it produce intrinsically quantum randomness? (iii) does it provide quantum safe security? (iv) does it perform a quantum computation correctly? Solving these questions is not only essential for the current development of quantum information technologies but, from a foundational perspective, goes at the heart of the fundamental question of what makes quantum physics special when compared to classical physics. CERQUTE successfully addressed all these questions by obtaining the following main outcomes:

1. Scalable and efficient methods for the detection of relevant quantum properties of many-body quantum systems
2. Improved proposals for the implementations of device-independent quantum information protocols
3. Study of quantum causal networks and understanding causality in the presence of quantum information
4. Construction of novel quantum information protocols in quantum networks taking advantage of network topologies
5. Novel security proofs for quantum cryptography protocols

CERQUTE therefore fully achieved its main goal, providing the concepts and tools needed for the quantum certification of quantum phenomena and devices.

Arbeit, die ab Beginn des Projekts bis zum Ende des durch den Bericht erfassten Berichtszeitraums geleistet wurde, und die wichtigsten bis dahin erzielten Ergebnisse

Quantum certification is a transversal concept covering many different aspects of quantum information science and technologies. The work in CERQUTE has followed this transversal character and considered different questions, systems and applications. The main results achieved are:

1. A new approach to certify the outputs of quantum optimisers
2. Methods to detect quantum correlations with no classical analogue in quantum networks
3. Novel protocols for fully or semi-device-independent quantum cryptography protocols with minimal assumptions on the devices used in the protocol
4. Application of machine learning methods to the characterization of many-body quantum systems
5. Proof that complex numbers are needed in the Hilbert-space description of quantum physics
6. Protocols to self-test arbitrary multi-qubit entangled states
7. A general framework to certify the randomness of quantum states and measurements
8. Methods to certify properties of quantum many-body states in a scalable way

All these results were published in high-impact journals and presented in top events in the field.

Fortschritte, die über den aktuellen Stand der Technik hinausgehen und voraussichtliche potenzielle Auswirkungen (einschließlich der bis dato erzielten sozioökonomischen Auswirkungen und weiter gefassten gesellschaftlichen Auswirkungen des Projekts)

The obtained results have significantly advanced our understanding of fundamental quantum phenomena and their use for the certification and development of novel quantum information technologies with no classical analogue. Expected results until the end of the project are:

1. Scalable and efficient methods for the detection of relevant quantum properties of many-body quantum systems
2. Improved proposals for the implementations of device-independent quantum information protocols
3. Study of quantum causal networks and understanding causality in the presence of quantum information
4. Construction of novel quantum information protocols in quantum networks taking advantage of the network topology and constraints
5. Novel security proofs for quantum cryptography protocols

CERQUTE certifies that systems and devices behave in a quantum way