Control and coherence time enhancement of the 0–π qubit
Kitaev’s 0– π qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0– π device can surpass that of today’s best superconducting qubits (Groszkowski et al 2018 New J. Ph...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ab09b0 |
| _version_ | 1797750151949844480 |
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| author | Agustin Di Paolo Arne L Grimsmo Peter Groszkowski Jens Koch Alexandre Blais |
| author_facet | Agustin Di Paolo Arne L Grimsmo Peter Groszkowski Jens Koch Alexandre Blais |
| author_sort | Agustin Di Paolo |
| collection | DOAJ |
| description | Kitaev’s 0– π qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0– π device can surpass that of today’s best superconducting qubits (Groszkowski et al 2018 New J. Phys. 20 043053). Here we address controllability of the 0– π qubit. Specifically, we investigate the potential for dispersive control and readout, and introduce a new, fast and high-fidelity single-qubit gate that can interpolate smoothly between logical X and Z . We characterize the action of this gate using a multi-level treatment of the device, and analyze the impact of circuit-element disorder and deviations in control and circuit parameters from their optimal values. Furthermore, we propose a cooling scheme to decrease the photon shot-noise dephasing rate, which we previously found to limit the coherence times of 0– π devices within reach of current experiments. Using this approach, we predict coherence time enhancements between one and three orders of magnitude, depending on parameter regime. |
| first_indexed | 2024-03-12T16:29:33Z |
| format | Article |
| id | doaj.art-88723ba8beaa4ef98fdd57eb77b187f7 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:29:33Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-88723ba8beaa4ef98fdd57eb77b187f72023-08-08T15:35:23ZengIOP PublishingNew Journal of Physics1367-26302019-01-0121404300210.1088/1367-2630/ab09b0Control and coherence time enhancement of the 0–π qubitAgustin Di Paolo0Arne L Grimsmo1Peter Groszkowski2Jens Koch3Alexandre Blais4Institut quantique and Département de Physique, Université de Sherbrooke , Sherbrooke, QC, CanadaInstitut quantique and Département de Physique, Université de Sherbrooke , Sherbrooke, QC, Canada; Centre for Engineered Quantum Systems, School of Physics, The University of Sydney , Sydney, NSW, AustraliaDepartment of Physics and Astronomy, Northwestern University , Evanston, IL 60208, United States of AmericaDepartment of Physics and Astronomy, Northwestern University , Evanston, IL 60208, United States of AmericaInstitut quantique and Département de Physique, Université de Sherbrooke , Sherbrooke, QC, Canada; Canadian Institute for Advanced Research , Toronto, ON, CanadaKitaev’s 0– π qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0– π device can surpass that of today’s best superconducting qubits (Groszkowski et al 2018 New J. Phys. 20 043053). Here we address controllability of the 0– π qubit. Specifically, we investigate the potential for dispersive control and readout, and introduce a new, fast and high-fidelity single-qubit gate that can interpolate smoothly between logical X and Z . We characterize the action of this gate using a multi-level treatment of the device, and analyze the impact of circuit-element disorder and deviations in control and circuit parameters from their optimal values. Furthermore, we propose a cooling scheme to decrease the photon shot-noise dephasing rate, which we previously found to limit the coherence times of 0– π devices within reach of current experiments. Using this approach, we predict coherence time enhancements between one and three orders of magnitude, depending on parameter regime.https://doi.org/10.1088/1367-2630/ab09b0superconducting qubitsquantum informationsuperinductances |
| spellingShingle | Agustin Di Paolo Arne L Grimsmo Peter Groszkowski Jens Koch Alexandre Blais Control and coherence time enhancement of the 0–π qubit New Journal of Physics superconducting qubits quantum information superinductances |
| title | Control and coherence time enhancement of the 0–π qubit |
| title_full | Control and coherence time enhancement of the 0–π qubit |
| title_fullStr | Control and coherence time enhancement of the 0–π qubit |
| title_full_unstemmed | Control and coherence time enhancement of the 0–π qubit |
| title_short | Control and coherence time enhancement of the 0–π qubit |
| title_sort | control and coherence time enhancement of the 0 π qubit |
| topic | superconducting qubits quantum information superinductances |
| url | https://doi.org/10.1088/1367-2630/ab09b0 |
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