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      Generation and transfer of squeezed states in a cavity magnomechanical system by two-tone microwave fields

      , , , , ,
      Optics Express
      Optica Publishing Group

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          Abstract

          We propose a scheme to generate squeezed states of magnon and phonon modes and verify squeezing transfer between different modes of distinct frequencies in a cavity magnomechanical system which is composed of a microwave cavity and a yttrium iron garnet sphere. We present that by activating the magnetostrictive force in the ferrimagnet, realized by driving the magnon mode with red-detuned and blue-detuned microwave fields, the driven magnon mode can be prepared in a squeezed state. Moreover, the squeezing can be transferred to the cavity mode via the cavity-magnon beamsplitter interaction with strong magnomechanical coupling. We show that under the weak coupling regime, large mechanical squeezing of phonon mode can be achieved, which verifies that our scheme can find the existence of quantum effects at macroscopic scales. Furthermore, distinct parameter regimes for obtaining large squeezing of the magnons and phonons are given, which is the principal feature of our scheme. The considered scheme can be extended to hybrid optical systems, and can facilitate the advancement for realization of strong mechanical squeezing in cavity magnomechanical systems.

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          Most cited references52

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          Decoherence and the Transition from Quantum to Classical

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            Approaching the quantum limit of a nanomechanical resonator.

            By coupling a single-electron transistor to a high-quality factor, 19.7-megahertz nanomechanical resonator, we demonstrate position detection approaching that set by the Heisenberg uncertainty principle limit. At millikelvin temperatures, position resolution a factor of 4.3 above the quantum limit is achieved and demonstrates the near-ideal performance of the single-electron transistor as a linear amplifier. We have observed the resonator's thermal motion at temperatures as low as 56 millikelvin, with quantum occupation factors of NTH = 58. The implications of this experiment reach from the ultimate limits of force microscopy to qubit readout for quantum information devices.
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              Theory of ground state cooling of a mechanical oscillator using dynamical backaction.

              A quantum theory of cooling of a mechanical oscillator by radiation pressure-induced dynamical backaction is developed, which is analogous to sideband cooling of trapped ions. We find that final occupancies well below unity can be attained when the mechanical oscillation frequency is larger than the optical cavity linewidth. It is shown that the final average occupancy can be retrieved directly from the optical output spectrum.
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                Author and article information

                Contributors
                Journal
                OPEXFF
                Optics Express
                Opt. Express
                Optica Publishing Group
                1094-4087
                2021
                2021
                March 31 2021
                April 12 2021
                : 29
                : 8
                : 11773
                Article
                10.1364/OE.418531
                33984952
                e0abed1f-92f8-4f2d-a909-d74ebf280dee
                © 2021

                https://doi.org/10.1364/OA_License_v1#VOR-OA

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