CNT-QUBIT SIGNED
Carbon Nanotube Quantum Circuits
Total Cost €
0EC-Contrib. €
0Partnership
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0CNT-QUBIT project word cloud
Explore the words cloud of the CNT-QUBIT project. It provides you a very rough idea of what is the project "CNT-QUBIT" about.
Project "CNT-QUBIT" data sheet
The following table provides information about the project.
| Coordinator |
UNIVERSITY COLLEGE LONDON
Organization address contact info |
| Coordinator Country | United Kingdom [UK] |
| Total cost | 1˙998˙574 € |
| EC max contribution | 1˙998˙574 € (100%) |
| Programme |
1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC)) |
| Code Call | ERC-2014-CoG |
| Funding Scheme | ERC-COG |
| Starting year | 2015 |
| Duration (year-month-day) | from 2015-09-01 to 2020-08-31 |
Partnership
Take a look of project's partnership.
| # | ||||
|---|---|---|---|---|
| 1 | UNIVERSITY COLLEGE LONDON | UK (LONDON) | coordinator | 1˙998˙574.00 |
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Project objective
The aim of this proposal is to use spin qubits defined in carbon nanotube quantum dots to demonstrate measurement-based entanglement in an all-electrical and scalable solid-state architecture. The project makes use of spin-orbit interaction to drive spin rotations in the carbon nanotube host system and hyperfine interaction to store quantum information in the nuclear spin states. The proposal builds on techniques developed by the principal investigator for fast and non-invasive read-out of the electron spin qubits using radio-frequency reflectometry and spin-to-charge conversion.
Any quantum computer requires entanglement. One route to achieve entanglement between electron spin qubits in quantum dots is to use the direct interaction of neighbouring qubits due to their electron wavefunction overlap. This approach, however, becomes rapidly impractical for any large scale quantum processor, as distant qubits can only be entangled through the use of qubits in between. Here I propose an alternative strategy which makes use of an intriguing quantum mechanical effect by which two spatially separated spin qubits coupled to a single electrical resonator become entangled if a measurement cannot tell them apart.
The quantum information encoded in the entangled electron spin qubits will be transferred to carbon-13 nuclear spins which are used as a quantum memory with coherence times that exceed seconds. Entanglement with further qubits then proceeds again via projective measurements of the electron spin qubits without risk of losing the existing entanglement. When entanglement of the electron spin qubits is heralded – which might take several attempts – the quantum information is transferred again to the nuclear spin states. This allows for the coupling of large numbers of physically separated qubits, building up so-called graph or cluster states in an all-electrical and scalable solid-state architecture.
Publications
| year | authors and title | journal | last update |
|---|---|---|---|
| 2017 |
Z. V. Penfold-Fitch, F. Sfigakis, M. R. Buitelaar Microwave Spectroscopy of a Carbon Nanotube Charge Qubit published pages: , ISSN: 2331-7019, DOI: 10.1103/PhysRevApplied.7.054017 |
Physical Review Applied 7/5 | 2019-06-06 |
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