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Superconducting nanocircuits for topologically protected qubits
- Source :
- Nature Physics, Nature Physics, Nature Publishing Group, 2008, 5, pp.48, Nature Physics, 2008, 5, pp.48
- Publication Year :
- 2008
- Publisher :
- HAL CCSD, 2008.
-
Abstract
- For successful realization of a quantum computer, its building blocks (qubits) should be simultaneously scalable and sufficiently protected from environmental noise. Recently, a novel approach to the protection of superconducting qubits has been proposed. The idea is to prevent errors at the "hardware" level, by building a fault-free (topologically protected) logical qubit from "faulty" physical qubits with properly engineered interactions between them. It has been predicted that the decoupling of a protected logical qubit from local noises would grow exponentially with the number of physical qubits. Here we report on the proof-of-concept experiments with a prototype device which consists of twelve physical qubits made of nanoscale Josephson junctions. We observed that due to properly tuned quantum fluctuations, this qubit is protected against magnetic flux variations well beyond linear order, in agreement with theoretical predictions. These results demonstrate the feasibility of topologically protected superconducting qubits.<br />Comment: 25 pages, 5 figures
- Subjects :
- Josephson effect
Flux qubit
[PHYS.COND.CM-SCE] Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
General Physics and Astronomy
FOS: Physical sciences
02 engineering and technology
Topology
01 natural sciences
Phase qubit
Superconductivity (cond-mat.supr-con)
Computer Science::Emerging Technologies
Quantum mechanics
0103 physical sciences
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Hardware_ARITHMETICANDLOGICSTRUCTURES
010306 general physics
Quantum fluctuation
ComputingMilieux_MISCELLANEOUS
Quantum computer
Physics
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed Matter - Superconductivity
Decoupling (cosmology)
Quantum Physics
021001 nanoscience & nanotechnology
Qubit
[PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
0210 nano-technology
Superconducting quantum computing
Subjects
Details
- Language :
- English
- ISSN :
- 17452473 and 14764636
- Database :
- OpenAIRE
- Journal :
- Nature Physics, Nature Physics, Nature Publishing Group, 2008, 5, pp.48, Nature Physics, 2008, 5, pp.48
- Accession number :
- edsair.doi.dedup.....15db90403b42de5c241ac87e8981c28c