Majumder, S and Bera, T and Suresh, R and Singh, V (2022) A Fast Tunable 3D-Transmon Architecture for Superconducting Qubit-Based Hybrid Devices. In: Journal of Low Temperature Physics, 207 (3-4). pp. 210-219.
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Abstract
Superconducting qubits utilize the strong non-linearity of Josephson junctions. Control over the Josephson nonlinearity, either by a current bias or by the magnetic flux, can be a valuable resource that brings tunability in the hybrid system consisting of superconducting qubits. To enable such a control, here we incorporate a fast-flux line for a frequency tunable transmon qubit in 3D cavity architecture. We investigate the flux-dependent dynamic range, relaxation from unconfined states, and the bandwidth of the flux-line. Using time-domain measurements, we probe the transmon’s relaxation from higher energy levels after populating the cavity with ≈ 2.1 × 10 4 photons. For the device used in the experiment, we find a resurgence time corresponding to the recovery of coherence to be 4.8μs. We use a fast-flux line to tune the qubit frequency and demonstrate the swap of a single excitation between cavity and qubit mode. By measuring the deviation in the transferred population from the theoretical prediction, we estimate the bandwidth of the flux line to be ≈ 100 MHz, limited by the parasitic effect in the design. These results suggest that the approach taken here to implement a fast-flux line in a 3D cavity could be helpful for the hybrid devices based on the superconducting qubit. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Low Temperature Physics |
| Publisher: | Springer |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Hybrid systems; Quantum optics; Qubits, 3D cavity; Fast flux; Fast tunable; Flux lines; Hybrid devices; Josephson; Josephson-junction; Superconducting qubits; Tunabilities; Tunables, Bandwidth |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 18 May 2022 10:51 |
| Last Modified: | 18 May 2022 10:51 |
| URI: | https://eprints.iisc.ac.in/id/eprint/71856 |
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