Majorana box qubits
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2017-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aa54e1 |
| _version_ | 1827873617812127744 |
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| author | Stephan Plugge Asbjørn Rasmussen Reinhold Egger Karsten Flensberg |
| author_facet | Stephan Plugge Asbjørn Rasmussen Reinhold Egger Karsten Flensberg |
| author_sort | Stephan Plugge |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T16:39:39Z |
| format | Article |
| id | doaj.art-96759819c9c04a519a8cbed529de12cb |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:39:39Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-96759819c9c04a519a8cbed529de12cb2023-08-08T14:35:06ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119101200110.1088/1367-2630/aa54e1Majorana box qubitsStephan Plugge0Asbjørn Rasmussen1Reinhold Egger2Karsten Flensberg3Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , DK-2100 Copenhagen, Denmark; Institut für Theoretische Physik, Heinrich-Heine-Universität , D-40225 Düsseldorf, GermanyCenter for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , DK-2100 Copenhagen, DenmarkInstitut für Theoretische Physik, Heinrich-Heine-Universität , D-40225 Düsseldorf, GermanyCenter for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen , DK-2100 Copenhagen, DenmarkQuantum 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.https://doi.org/10.1088/1367-2630/aa54e1topological qubitMajorana bound statesquantum devices |
| spellingShingle | Stephan Plugge Asbjørn Rasmussen Reinhold Egger Karsten Flensberg Majorana box qubits New Journal of Physics topological qubit Majorana bound states quantum devices |
| title | Majorana box qubits |
| title_full | Majorana box qubits |
| title_fullStr | Majorana box qubits |
| title_full_unstemmed | Majorana box qubits |
| title_short | Majorana box qubits |
| title_sort | majorana box qubits |
| topic | topological qubit Majorana bound states quantum devices |
| url | https://doi.org/10.1088/1367-2630/aa54e1 |
| work_keys_str_mv | AT stephanplugge majoranaboxqubits AT asbjørnrasmussen majoranaboxqubits AT reinholdegger majoranaboxqubits AT karstenflensberg majoranaboxqubits |