FastoSpintrolux · Fast and Nanoscale Spin Control via Single Flux Quanta in Superconductors
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2020-10-14 → 2022-10-13
- EU contribution
- €196,708
- Participants
- 1
- Scheme
- MSCA-IF
Lines connect the coordinator with its partners.
Results in brief
Fast and Nanoscale Spin Control via Single Flux Quanta in Superconductors
This project “FastoSpintrolux” aims to address two key problems in quantum science and technologies: the speed and spatial precision of coherent control over the quantum states of a qubit (an object which usually have two discrete spin states, i.e., a nitrogen-vacancy defect in diamond in this project). The importance of this subject is manifested in two aspects. First of all, in order to build large and scalable quantum networks, a large number of qubits are involved and could be densely distributed in a small region on microchips or photonic devices. Because of the large micrometer size, conventional microwave devices that are used for spin manipulation are not compatible with the (nanometer) small size and distance between qubits. In general, there is lack of effective tool which can address single qubits with nanometer precision. In addition, due to the interaction with local environment and the finite dephasing time, quantum properties of qubits usually do not last very long, which are detrimental for sufficient interrogations and quantum operations. An increase in the spin control rate will increase the number of coherent operations on the quantum states of qubit, thus improving the fidelity and accuracy of quantum measurements. Therefore, the overall objective of this project is to demonstrate and develop a novel and efficient method which allows the control over quantum states of single qubit with nanometer spatial precision and fast speed up to gigahertz (10^9 Hz), with the help of laser-manipulated microscopic vortices which is quantized flux in a superconductor and smallest magnetic object available so far. For the benefit of the society, the technology developed in the project not only increase the fidelity in quantum sensing which leads to an improvement in measurement accuracy, but also open new possibilities of efficiently coupling and entangling distant qubits, which are very important in quantum teleportation and communication. For the academic community, the project will fuel novel fundamental studies on the interplay between quantum qubit and microscopic vortices, as well as many-body problems.
Data: CORDIS, © European Union
Project objective
Quantum control of spin qubit plays a key role in spintronics, quantum sensing and quantum information processing. The spin control rate determines the quantum state fidelity and the accuracy in quantum sensing, and thus needs to be enhanced for many applications. Meanwhile, building scalable quantum technology often involves densely distributed qubits, which requires the feasibility of addressing individual spins with high spatial resolution. In order to cope with the growing demand for the operational rate and spatial precision, the experienced researcher proposes to use single flux quanta (Abrikosov vortices) in superconductors to individually address the electronic spin of nitrogen-vacancy (NV) centers with far-field optics. Optical manipulation of single vortices like optical tweezers enable the nanoscale addressability of individual spins. By rapidly passing a vortex and its strong field through the spin target, he aims at swiftly tuning the spin resonance and coherently driving spin transitions with gigahertz rate. This proposal opens new possibilities of exploring the coupling between mesoscopic flux quanta and single qubits, and provides a promising method for efficiently entangling multiple spins via optically driven Abrikosov vortices.
Original text from CORDIS.
Participants
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisCoordinatorFrance
Links
Data: CORDIS, © European Union