Browsing by Author "Crump, Wayne"

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    Acoustic Integration of Superconducting Qubit Circuits
    (2022-08-25) Tuuliainen, Leo; Crump, Wayne; Perustieteiden korkeakoulu; Sillanpää, Mika
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    Coupling high-overtone bulk acoustic wave resonators via superconducting qubits
    (American Institute of Physics, 2023-09-25) Crump, Wayne; Välimaa, Alpo; Sillanpää, Mika A.; Department of Applied Physics; Quantum Nanomechanics; Centre of Excellence in Quantum Technology, QTF
    In this work, we present a device consisting of two coupled transmon qubits, each of which are coupled to an independent high-overtone bulk acoustic wave resonator (HBAR). Both HBAR resonators support a plethora of acoustic modes, which can couple to the qubit near resonantly. We first show qubit-qubit interaction in the multimode system and, finally, quantum state transfer where an excitation is swapped from an HBAR mode of one qubit to an HBAR mode of the other qubit.
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    Multiphonon Transitions in a Quantum Electromechanical System
    (American Physical Society, 2022-06) Välimaa, Alpo; Crump, Wayne; Kervinen, Mikael; Sillanpää, Mika A.; Department of Applied Physics; Centre of Excellence in Quantum Technology, QTF; Quantum Nanomechanics
    Studies of micromechanical and acoustic modes in the quantum regime have shed light on quantum properties of massive objects. Integrating these systems into superconducting circuits shows great promise for applications as quantum memory elements, bosonic codes, or in frequency conversion. To this end, investigation of nonclassical properties of acoustic degrees of freedom is critical also for applications. Here, we investigate a strongly driven system consisting of a transmon qubit interacting with a high-overtone bulk acoustic resonator. We observe multiphonon transitions, which enable mapping the energy landscape in the coupled system. At a high driving amplitude comparable to the qubit-oscillator coupling, we observe a shift of the multiphonon spectral lines, reminiscent of Stark shift, which is explained using a simple model. Our work thus also provides insight in multiquanta transitions in other qubit-oscillator systems, not limited to acoustics or circuit quantum electrodynamics.