Majorana box qubits

By S. Plugge, Asbjørn Rasmussen, R. Egger, K. Flensberg. 2016

294 citations recorded by the source corpus.

Quantum information protected by the topology of the storage medium is expected to exhibit long coherence times. Another feature is topologically protected gates generated through braiding of Majorana bound states (MBSs). However, braiding requires structures with branched topological segments which have inherent difficulties in the semiconductor–superconductor heterostructures now believed to host MBSs. In this paper, we construct quantum bits taking advantage of the topological protection and non-local properties of MBSs in a network of parallel wires, but without relying on braiding for quantum gates. The elementary unit is made from three topological wires, two wires coupled by a trivial superconductor and the third acting as an interference arm. Coulomb blockade of the combined wires spawns a fractionalized spin, non-locally addressable by quantum dots used for single-qubit readout, initialization, and manipulation. We describe how the same tools allow for measurement-based implementation of the Clifford gates, in total making the architecture universal. Proof-of-principle demonstration of topologically protected qubits using existing techniques is therefore within reach.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/dca13c8812158f224947c3a89348970359303249

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Effects of Gate-Induced Electric Fields on Semiconductor Majorana Nanowires (2018, unknown): “[79] Stephan Plugge, Asbjørn Rasmussen, Reinhold Egger,”
Quantum information processing with superconducting circuits: a review (2016, background): “A major issue is how to manipulate topologically protected qubits to allow universal quantum computation [170, 171].”
Scalable designs for quasiparticle-poisoning-protected topological quantum computation with Majorana zero modes (2016, background): “[26], and measurements are performed by detecting frequency shifts of double-dot systems.”