Cavity Quantum Acoustic Device in the Multimode Strong Coupling Regime
| Autor: | Lucas Sletten, Konrad Lehnert, J. J. Viennot, Bradley A. Moores |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Phonon FOS: Physical sciences Physics::Optics General Physics and Astronomy 02 engineering and technology Transmon 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Laser linewidth Circuit quantum electrodynamics Qubit Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Physics::Accelerator Physics Spontaneous emission Atomic physics Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Free spectral range |
| Zdroj: | Physical Review Letters. 120 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We investigate an acoustical analog of circuit quantum electrodynamics that facilitates compact high-Q (${>}20,000$) microwave-frequency cavities with dense spectra. We fabricate and characterize a device that comprises a flux tunable transmon coupled to a $300\,\mathrm{��m}$ long surface acoustic wave resonator. For some modes, the qubit-cavity coupling reaches $6.5\,\mathrm{MHz}$, exceeding the cavity loss rate ($200\,\mathrm{kHz}$), qubit linewidth ($1.1\,\mathrm{MHz}$), and the cavity free spectral range ($4.8\,\mathrm{MHz}$), placing the device in both the strong coupling and strong multimode regimes. With the qubit detuned from the cavity, we show that the dispersive shift behaves according to predictions from a generalized Jaynes-Cummings Hamiltonian. Finally, we observe that the qubit linewidth strongly depends on its frequency, as expected for spontaneous emission of phonons, and we identify operating frequencies where this emission rate is suppressed. |
| Databáze: | OpenAIRE |
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