Periodic Reporting for period 2 - CERQUTE (Certification of quantum technologies)
Période du rapport: 2021-07-01 au 2022-12-31
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 aims at providing the concepts and tools needed for the quantum certification of quantum phenomena and devices.
Quantum certification is a transversal concept covering many different aspects of quantum information science and technologies. The work performed during the reported period has maintained this transversal character and considered different questions, systems and applications. So far, 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
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
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
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