Short-range optical Quantum Connections
Calls: ERA-NET QuantERA
Start date: 2019-12-16 End date: 2022-12-15
Total Budget: EUR 1.500.000,00 INO share of the total budget: EUR 166.291,66
Scientific manager: Peter van Loock and for INO is: Bellini Marco
Organization/Institution/Company main assignee: Universität Mainz (UM)
other Organization/Institution/Company involved:
Max Planck Institute for the Science of Light (MPL)
Sorbonne Université (SU)
Technical University of Denmark (DTU)
Université libre de Bruxelles (ULB)
Univerzita Palackeho v Olomouci (UP)
In contrast to distances of 1000km or more, as usually envisaged with quantum repeaters, the channel lengths considered are as short as a few meters and no longer than 10km. However, fidelities for directly transmitting fragile highly non-classical states may be far from unity even at such short distances. Especially, errors that do not originate from transmission loss, such as instabilities through thermal noise or mechanical vibrations in a building, will become important. Reliably and efficiently connecting quantum computers through a future broadband local area network will require a high level of fault tolerance. Thus, optical quantum connections based on advanced quantum technology, including quantum error detection and correction, will become crucial in the deployment of future quantum data centers and their interconnects.
First, we will explore the fundamental limits and performance of direct quantum connections independent of active quantum error correction, only depending on the quantum optical engineering of modes, states, and channels. Second, we will include the possibility of quantum error detection in entanglement-based short-range relays or repeaters. In a third approach, we will incorporate channel-adapted quantum error correction codes to suppress errors that occur in a realistic short-range quantum link. The project will compare these approaches and determine the best combination of theoretical optimality and experimental feasibility.