Quantum state control & manipulation - development of quantum computer hardware

Project funded by Swedish Research Council (Project grant), grant 2010-04520_VR. Participating organisations named by the source: Lund University. Funded amount: SEK 2,850,000, as stated by the source. Runs 2011-01-01 to 2013-12-31. Keywords: Oklassificerat, Unclassified. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2025-12-05); national funding data, not CORDIS. Abstract given by the source: We develop quantum computer hardware based on rare-earth-ion doped crystals. This requires the development of methods and techniques for the creation and control of superposition and entangled states and it requires characterisation and elimination of decoherence processes for increasingly complex quantum mechanical systems. High fidelity (>90%) arbitrary single-qubit operations and qubit-qubit interactions for qubits that consist of millions of ions have been demonstrated. Such qubits give strong signals, but elaborate pulse sequences are required to ascertain that all ions within the qubit have identical wave functions. To be able to efficiently work with multi-qubit systems we develop techniques where each qubit consists of a single ion. The development and characterisation of qubits, each consisting of a single ion, is the key objective in the proposal. A highly stabilised laser system has been built in order to get sufficient precision in controlling the qubit wave functions. Typical experiments involve of the order of 1000 optical pulses. The action of the excitation sequences is simulated and we have extensive computer control of the experiments allowing us to proceed to increasingly complicated pulse sequences. The experiments in front of us are highly challenging as well as technically and scientifically inspiring. Many students approach us for diploma works and the projects constitute an excellent educational environment for graduate students and postdocs.

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Swedish Research Council. Retrieved 2026-10-22. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: A project funded by the Swedish Research Council, running from 2011 to 2013, aims to develop quantum computer hardware using rare-earth-ion doped crystals, focusing on state control and decoherence elimination. Suggested technology pillar: computing. Generated by AI from the public source text; it may contain errors and the original source is authoritative.