Entangling logical qubits with lattice surgery

Alexander Erhard, Hendrik Poulsen Nautrup, Michael Meth, Lukas Postler, Roman Stricker, Martin Stadler, Vlad Negnevitsky, Martin Ringbauer, Philipp Schindler, Hans J. Briegel, Rainer Blatt, Nicolai Friis () and Thomas Monz ()
Additional contact information
Alexander Erhard: University of Innsbruck
Hendrik Poulsen Nautrup: University of Innsbruck
Michael Meth: University of Innsbruck
Lukas Postler: University of Innsbruck
Roman Stricker: University of Innsbruck
Martin Stadler: ETH Zürich
Vlad Negnevitsky: ETH Zürich
Martin Ringbauer: University of Innsbruck
Philipp Schindler: University of Innsbruck
Hans J. Briegel: University of Innsbruck
Rainer Blatt: University of Innsbruck
Nicolai Friis: University of Innsbruck
Thomas Monz: University of Innsbruck

Nature, 2021, vol. 589, issue 7841, 220-224

Abstract: Abstract The development of quantum computing architectures from early designs and current noisy devices to fully fledged quantum computers hinges on achieving fault tolerance using quantum error correction1–4. However, these correction capabilities come with an overhead for performing the necessary fault-tolerant logical operations on logical qubits (qubits that are encoded in ensembles of physical qubits and protected by error-correction codes)5–8. One of the most resource-efficient ways to implement logical operations is lattice surgery9–11, where groups of physical qubits, arranged on lattices, can be merged and split to realize entangling gates and teleport logical information. Here we report the experimental realization of lattice surgery between two qubits protected via a topological error-correction code in a ten-qubit ion-trap quantum information processor. In this system, we can carry out the necessary quantum non-demolition measurements through a series of local and entangling gates, as well as measurements on auxiliary qubits. In particular, we demonstrate entanglement between two logical qubits and we implement logical state teleportation between them. The demonstration of these operations—fundamental building blocks for quantum computation—through lattice surgery represents a step towards the efficient realization of fault-tolerant quantum computation.

Date: 2021
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/s41586-020-03079-6 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:589:y:2021:i:7841:d:10.1038_s41586-020-03079-6

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/s41586-020-03079-6

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().