Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits
We show that the microwave (MW) spectra in semiconductor-nanowire-based transmon qubits provide a strong signature of the presence of Majorana bound states in the junction. This occurs as an external magnetic field tunes the wire into the topological regime and the energy splitting of the emergent M...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020-09-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.033493 |
| _version_ | 1797211261293821952 |
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| author | J. Ávila E. Prada P. San-Jose R. Aguado |
| author_facet | J. Ávila E. Prada P. San-Jose R. Aguado |
| author_sort | J. Ávila |
| collection | DOAJ |
| description | We show that the microwave (MW) spectra in semiconductor-nanowire-based transmon qubits provide a strong signature of the presence of Majorana bound states in the junction. This occurs as an external magnetic field tunes the wire into the topological regime and the energy splitting of the emergent Majorana modes oscillates around zero energy owing to their wave function spatial overlap in finite-length wires. In particular, we discuss how these Majorana oscillations, and the concomitant fermion parity switches in the ground state of the junction, result in distinct spectroscopic features—in the form of an intermittent visibility of absorption lines—that strongly deviate from standard transmon behavior. In contrast, nonoscillating zero modes, such as topologically trivial Andreev bound states resulting from sufficiently smooth potentials, exhibit an overall standard transmon response. These differences in the MW response could help determine whether the junction contains topological Majoranas or not. |
| first_indexed | 2024-04-24T10:23:41Z |
| format | Article |
| id | doaj.art-4ff78bb9e18d4dbbb0a7bcc24151e10f |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:23:41Z |
| publishDate | 2020-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-4ff78bb9e18d4dbbb0a7bcc24151e10f2024-04-12T17:01:22ZengAmerican Physical SocietyPhysical Review Research2643-15642020-09-012303349310.1103/PhysRevResearch.2.033493Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubitsJ. ÁvilaE. PradaP. San-JoseR. AguadoWe show that the microwave (MW) spectra in semiconductor-nanowire-based transmon qubits provide a strong signature of the presence of Majorana bound states in the junction. This occurs as an external magnetic field tunes the wire into the topological regime and the energy splitting of the emergent Majorana modes oscillates around zero energy owing to their wave function spatial overlap in finite-length wires. In particular, we discuss how these Majorana oscillations, and the concomitant fermion parity switches in the ground state of the junction, result in distinct spectroscopic features—in the form of an intermittent visibility of absorption lines—that strongly deviate from standard transmon behavior. In contrast, nonoscillating zero modes, such as topologically trivial Andreev bound states resulting from sufficiently smooth potentials, exhibit an overall standard transmon response. These differences in the MW response could help determine whether the junction contains topological Majoranas or not.http://doi.org/10.1103/PhysRevResearch.2.033493 |
| spellingShingle | J. Ávila E. Prada P. San-Jose R. Aguado Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits Physical Review Research |
| title | Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits |
| title_full | Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits |
| title_fullStr | Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits |
| title_full_unstemmed | Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits |
| title_short | Majorana oscillations and parity crossings in semiconductor nanowire-based transmon qubits |
| title_sort | majorana oscillations and parity crossings in semiconductor nanowire based transmon qubits |
| url | http://doi.org/10.1103/PhysRevResearch.2.033493 |
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