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Superconducting quantum circuits at the surface code threshold for fault tolerance
- Source :
- Nature, vol 508, iss 7497, Barends, R; Kelly, J; Megrant, A; Veitia, A; Sank, D; Jeffrey, E; et al.(2014). Superconducting quantum circuits at the surface code threshold for fault tolerance. Nature, 508(7497), 500-503. doi: 10.1038/nature13171. UC Riverside: Retrieved from: http://www.escholarship.org/uc/item/81f38826
- Publication Year :
- 2014
- Publisher :
- Springer Science and Business Media LLC, 2014.
-
Abstract
- A quantum computer can solve hard problems, such as prime factoring, database searching and quantum simulation, at the cost of needing to protect fragile quantum states from error. Quantum error correction provides this protection by distributing a logical state among many physical quantum bits (qubits) by means of quantum entanglement. Superconductivity is a useful phenomenon in this regard, because it allows the construction of large quantum circuits and is compatible with microfabrication. For superconducting qubits, the surface code approach to quantum computing is a natural choice for error correction, because it uses only nearest-neighbour coupling and rapidly cycled entangling gates. The gate fidelity requirements are modest: the per-step fidelity threshold is only about 99 per cent. Here we demonstrate a universal set of logic gates in a superconducting multi-qubit processor, achieving an average single-qubit gate fidelity of 99.92 per cent and a two-qubit gate fidelity of up to 99.4 per cent. This places Josephson quantum computing at the fault-tolerance threshold for surface code error correction. Our quantum processor is a first step towards the surface code, using five qubits arranged in a linear array with nearest-neighbour coupling. As a further demonstration, we construct a five-qubit Greenberger-Horne-Zeilinger state using the complete circuit and full set of gates. The results demonstrate that Josephson quantum computing is a high-fidelity technology, with a clear path to scaling up to large-scale, fault-tolerant quantum circuits. © 2014 Macmillan Publishers Limited.
- Subjects :
- Quantum network
cond-mat.supr-con
Multidisciplinary
General Science & Technology
Computer science
Quantum Physics
Quantum capacity
Topology
Quantum technology
Computer Science::Hardware Architecture
Computer Science::Emerging Technologies
Quantum gate
quant-ph
Quantum error correction
Quantum mechanics
cond-mat.mes-hall
Quantum algorithm
Quantum information
Quantum computer
Subjects
Details
- ISSN :
- 14764687 and 00280836
- Volume :
- 508
- Database :
- OpenAIRE
- Journal :
- Nature
- Accession number :
- edsair.doi.dedup.....ada78ba2c636a4e0f2e99608be3df104