Quantum squeezing in a nonlinear mechanical oscillator

• URL: http://arxiv.org/abs/2312.16169v1
• Date: Tue, 26 Dec 2023 18:57:01 GMT
• Title: Quantum squeezing in a nonlinear mechanical oscillator
• Authors: Stefano Marti, Uwe von L\"upke, Om Joshi, Yu Yang, Marius Bild, Andraz Omahen, Yiwen Chu, and Matteo Fadel
• Abstract summary: Mechanical degrees of freedom are natural candidates for continuous-variable quantum information processing. We demonstrate ground state squeezing of a gigahertz-frequency mechanical resonator coupled to a superconducting qubit.
• Score: 2.203084162322062
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Mechanical degrees of freedom are natural candidates for continuous-variable quantum information processing and bosonic quantum simulations. These applications, however, require the engineering of squeezing and nonlinearities in the quantum regime. Here we demonstrate ground state squeezing of a gigahertz-frequency mechanical resonator coupled to a superconducting qubit. This is achieved by parametrically driving the qubit, which results in an effective two-phonon drive. In addition, we show that the resonator mode inherits a nonlinearity from the off-resonant coupling with the qubit, which can be tuned by controlling the detuning. We thus realize a mechanical squeezed Kerr oscillator, where we demonstrate the preparation of non-Gaussian quantum states of motion with Wigner function negativities and high quantum Fisher information. This shows that our results also have applications in quantum metrology and sensing.

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