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The following table provides information about the project.
TECHNISCHE UNIVERSITEIT DELFT
|Coordinator Country||Netherlands [NL]|
|Total cost||1˙499˙910 €|
|EC max contribution||1˙499˙910 € (100%)|
1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
|Duration (year-month-day)||from 2019-11-01 to 2024-10-31|
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|1||TECHNISCHE UNIVERSITEIT DELFT||NL (DELFT)||coordinator||1˙499˙910.00|
A key question for quantum science is: Can quantum systems be protected from decoherence? This is not just a fundamental question; if we can reliably control large quantum states, it becomes possible to perform precise tests of quantum mechanics and computational tasks that go beyond classical physics.
A promising approach is to protect quantum states by distributing quantum error correction over quantum networks. These networks consist of nodes that contain quantum bits to store and process quantum states, and that are connected by entanglement links based on photons. This approach is naturally scalable to larger sizes by connecting independent modules, and a wide variety of fascinating error correction codes is enabled by different network topologies.
Pioneering experiments have demonstrated basic elements of quantum networks in various systems. However, due to the required precise understanding and control of complex quantum systems, protecting quantum networks against decoherence remains a major outstanding challenge in quantum science.
The goal of this proposal is to demonstrate the detection of quantum errors over a 4-node quantum network. This network forms a unit cell that demonstrates all key principles for larger error-corrected quantum networks. This ambitious goal can now be pursued due to two advances by my colleagues and me using NV centers in diamond: (1) Entanglement of two NV centers through photons and (2) Complete control over multiple nuclear spins coupled to single NV centers. To realize the network, I will develop robust quantum memories, non-destructive spin measurements, and a precise microscopic understanding and control of coupled spin systems in diamond.
Reaching this goal will be a potentially decisive step towards large quantum networks and distributed quantum computations: we will enter a new territory in which quantum states can be made more stable by making networks larger and larger, ultimately completely overcoming decoherence.
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