QUSON · Quantum Sensing with Quantum Optical Networks
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2018-06-04 → 2020-06-03
- EU contribution
- €183,455
- Participants
- 2
- Scheme
- MSCA-IF-EF-ST
Lines connect the coordinator with its partners.
Results in brief
Quantum Sensing with Quantum Optical Networks
Sensors play a key role in our modern society. They are an essential component in all kind of technologies, ranging from smartphones and cars to large-scale applications in industrial engineering. The new paradigm of quantum sensing is based on the idea of exploiting quantum effects, such as entanglement, to build measurement devices with greatly enhanced sensitivities. Prospective examples include clocks and sensors for applications in defence, gravity sensors for subsurface mapping in civil engineering, or quantum magnetometers for healthcare and diagnosis. In the last decade we have witnessed a significant advance in experimental platforms such as trapped ion setups and superconducting circuits. These systems are never free from noise and dissipation, given that they need to couple to the external world that we want to measure. Unfortunately, the dissipation induced by the coupling to the environment has very detrimental effects for the generation of quantum states that can be used in metrology. However, even in systems with strong dissipation, cooperative many-body effects may induce complex quantum dynamics, with emergent phenomena such as non-equilibrium phase transitions and multi-stability. The question then arises whether we can exploit those many-body effects in robust metrological protocols. In this project, we have investigated the potential to generate and harvest quantum correlations in dissipative many-body systems for its use in metrology. Our work has established several viable platforms where dissipation can become an asset rather than a liability, paving the way for a next generation of quantum sensors in dissipative environments.
Data: CORDIS, © European Union
Project objective
Quantum sensing exploits effects such as entanglement to enhance the sensitivity of measurement devices. In the last decade we have witnessed a significant advance in experimental platforms such as trapped ion setups and superconducting circuits. These systems are never free from noise and dissipation, however, interactions between qubits and photons or phonons can be controlled with lasers or external fields. Even in strong dissipative regimes, cooperative effects may induce complex quantum dynamics with emergent phenomena such as non-equilibrium phase transitions and multistability. The question then arises whether we can exploit those many-body effects in robust metrological protocols. My project will address this question in two main scenarios corresponding to different limits of a network of qubits coupled to photonic cavities. Firstly, I will consider a limit of weak coupling, in which cooperative radiative decay leads to the generation of entanglement. Secondly, I will investigate networks of qubits strongly coupled to photonic cavities. I will identify, and systematically investigate, points close to non-equilibrium phase transitions in which the abrupt response of the system can be used to accurately measure properties of driving fields. The project requires a rigorous theoretical description of the qubit-cavity network. Approximations such as a mean-field theory can be used for a preliminary study. However, to achieve my goals I will need to properly describe quantum correlations across the system. I will address this challenge by using Matrix Product States methods - an advanced quasi-exact numerical technique. My reference systems will be trapped ion setups and superconducting qubits coupled to microwave resonators. In my project, I will systematically investigate their performance as quantum sensors under realistic conditions. My work will lead to proposals for the accurate measurement of microwave fields, magnetic fields and ultra-weak forces.
Original text from CORDIS.
Participants
- THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD · OxfordCoordinatorUnited Kingdom
- THE UNIVERSITY OF SUSSEX · BrightonUnited Kingdom
Links
Data: CORDIS, © European Union