Universität zu Köln

Plugge, S., Landau, L. A., Sela, E., Altland, A., Flensberg, K. and Egger, R. (2016). Roadmap to Majorana surface codes. Phys. Rev. B, 94 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Surface codes offer a very promising avenue towards fault-tolerant quantum computation. We argue that two-dimensional interacting networks of Majorana bound states in topological superconductor/semiconductor heterostructures hold several key advantages in that direction, concerning both the hardware realization and the actual operation of the code. We here discuss how topologically protected logical qubits in this Majorana surface code architecture can be defined, initialized, manipulated, and read out. All physical ingredients needed to implement these operations are routinely used in topologically trivial quantum devices. By means of quantum interference terms in linear conductance measurements, single-electron pumping protocols, and gate-tunable tunnel barriers, the full set of quantum gates required for universal quantum computation can be achieved. In particular, we show that designated multistep pumping sequences via tunnel-coupled quantum dots realize high-fidelity ancilla states for phase gates.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Plugge, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Landau, L. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sela, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Altland, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Flensberg, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Egger, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-255488
DOI:	10.1103/PhysRevB.94.174514
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	17
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ERROR-DETECTION; HARD GAP; QUANTUM; FERMIONS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25548