Topologically protected quantum bits using Josephson junction arrays

L. B. Ioffe, M. V. Feigel'man, A. Ioselevich, D. Ivanov, M. Troyer, G. Blatter

Research output: Contribution to journalArticlepeer-review

184 Citations (Scopus)

Abstract

All physical implementations of quantum bits (or qubits, the logical elements in a putative quantum computer) must overcome conflicting requirements: The qubits should be manipulable through external signals, while remaining isolated from their environment. Proposals based on quantum optics emphasize optimal isolation, while those following the solid-state route exploit the variability and scalability of nanoscale fabrication techniques. Recently, various designs using superconducting structures have been successfully tested for quantum coherent operation, however, the ultimate goal of reaching coherent evolution over thousands of elementary operations remains a formidable task. Protecting qubits from decoherence by exploiting topological stability is a qualitatively new proposal that holds promise for long decoherence times, but its physical implementation has remained unclear. Here we show how strongly correlated systems developing an isolated twofold degenerate quantum dimer liquid ground state can be used in the construction of topologically stable qubits; we discuss their implementation using Josephson junction arrays. Although the complexity of their architecture challenges the technology base available today, such topological qubits greatly benefit from their built-in fault-tolerance.

Original languageEnglish
Pages (from-to)503-506
Number of pages4
JournalNature
Volume415
Issue number6871
DOIs
Publication statusPublished - 31 Jan 2002
Externally publishedYes

Fingerprint

Dive into the research topics of 'Topologically protected quantum bits using Josephson junction arrays'. Together they form a unique fingerprint.

Cite this