Bera, T and Majumder, S and Sahu, SK and Singh, V (2021) Large flux-mediated coupling in hybrid electromechanical system with a transmon qubit. In: Communications Physics, 4 (1).
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Abstract
Control over the quantum states of a massive oscillator is important for several technological applications and to test the fundamental limits of quantum mechanics. Addition of an internal degree of freedom to the oscillator could be a valuable resource for such control. Recently, hybrid electromechanical systems using superconducting qubits, based on electric-charge mediated coupling, have been quite successful. Here, we show a hybrid device, consisting of a superconducting transmon qubit and a mechanical resonator coupled using the magnetic-flux. The coupling stems from the quantum-interference of the superconducting phase across the tunnel junctions. We demonstrate a vacuum electromechanical coupling rate up to 4 kHz by making the transmon qubit resonant with the readout cavity. Consequently, thermal-motion of the mechanical resonator is detected by driving the hybridized-mode with mean-occupancy well below one photon. By tuning qubit away from the cavity, electromechanical coupling can be enhanced to 40 kHz. In this limit, a small coherent drive on the mechanical resonator results in the splitting of qubit spectrum, and we observe interference signature arising from the Landau-Zener-Stückelberg effect. With improvements in qubit coherence, this system offers a platform to realize rich interactions and could potentially provide full control over the quantum motional states. © 2021, The Author(s).
| Item Type: | Journal Article |
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| Publication: | Communications Physics |
| Publisher: | Nature Research |
| Additional Information: | Copyright to this article belongs to Nature Research |
| Keywords: | Acoustic resonators; Degrees of freedom (mechanics); Electromechanical coupling; Quantum theory; Superconducting resonators; Tunnel junctions, Degree of freedom; Electromechanical systems; Hybridized modes; Mechanical resonators; Quantum interference; Superconducting phase; Superconducting qubits; Technological applications, Qubits |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 09 Feb 2021 07:53 |
| Last Modified: | 09 Feb 2021 07:53 |
| URI: | http://eprints.iisc.ac.in/id/eprint/67849 |
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