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Quantum Frontiers

Long-lifetime coherent storage for microwave photons in the magnomechanical resonator

Guan-Ting Xu, Yu Wang, Mai Zhang, Zhen Shen, Xi‐Feng Ren, Guang‐Can Guo, Chun‐Hua Dong

Published Nov 27, 2023• 1 citation
Publisher

Abstract

Abstract The storage of quantum states and information is essential for enabling large quantum networks. The direct implementation of storage in magnonic systems, which are emerging as crucial components in quantum networks, has also garnered attention. In this study, we present experimental investigations of magnomechanical microwave storage for the first time. By reducing the ambient temperature to 8 K, we can achieve a mechanical mode with a narrow linewidth as low as 6.4 Hz, resulting in an energy decay time of 24.8 ms. Furthermore, we employ Ramsey interferometry to investigate the coherence of the magnomechanical memory. The mechanical interference can be utilized to evaluate the decoherence lifetime of 19.5 ms. Our proposed scheme provides the potential to utilize magnomechanical systems as quantum memory for photonic quantum information.

DOI
10.1007/s44214-023-00044-y

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Abstract We show how a quantum state in a microwave cavity mode can be transferred to and stored in a phononic mode via an intermediate magnon mode in a magnomechanical system. For this we consider a ferrimagnetic yttrium iron garnet (YIG) sphere inserted in a microwave cavity, where the microwave and magnon modes are coupled via a magnetic-dipole interaction and the magnon and phonon modes in the YIG sphere are coupled via magnetostrictive forces. By modulating the cavity and magnon detunings and the driving of the magnon mode in time, a stimulated Raman adiabatic passage-like coherent transfer becomes possible between the cavity mode and the phonon mode. The phononic mode can be used to store the photonic quantum state for long periods as it possesses lower damping than the photonic and magnon modes. Thus our proposed scheme offers a possibility of using magnomechanical systems as quantum memory for photonic quantum information.
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We show how a quantum state in a microwave cavity mode can be transferred to and stored in a phononic mode via an intermediate magnon mode in a magnomechanical system. For this we consider a ferrimagnetic yttrium iron garnet (YIG) sphere inserted in a microwave cavity, where the microwave and magnon modes are coupled via a magnetic-dipole interaction and the magnon and phonon modes in the YIG sphere are coupled via magnetostrictive forces. By modulating the cavity and magnon detunings and the driving of the magnon mode in time, a stimulated Raman adiabatic passage-like coherent transfer becomes possible between the cavity mode and the phonon mode. The phononic mode can be used to store the photonic quantum state for long periods as it possesses lower damping than the photonic and magnon modes. Thus our proposed scheme offers a possibility of using magnomechanical systems as quantum memory for photonic quantum information.
Cavity optomechanical system holds potential for applications in ultrasensitive detection and serves as a fundamental element in the development of general quantum networks. Here we experimentally present the coherent storage of microwave signal utilizing a cavity electromechanical system comprising a high-quality factor SiN membrane resonator and superconducting cavity. It demonstrates that the coherent storage time is high to 50 ms, with acquisition of less than one quantum noise during this timeframe. These results indicate that long-coherent-time phonons could serve as ideal candidates for the development of quantum memories in quantum computers.
Long-lived mechanical oscillators are actively pursued as critical resources for quantum storage, sensing, and transduction. However, achieving deterministic quantum control while limiting mechanical dissipation remains a persistent challenge. Here, we demonstrate strong coupling between a transmon superconducting qubit and an ultra-long-lived nanomechanical oscillator (T1≈25 msT_\text{1} \approx 25 \text{ ms}T1​≈25 ms at 5 GHz, Q≈0.8×109Q \approx 0.8 \times 10^9Q≈0.8×109) by leveraging the low acoustic loss in silicon and phononic bandgap engineering. The qubit-oscillator system achieves large cooperativity (CT1≈1.5×105C_{T_1}\approx 1.5\times10^5CT1​​≈1.5×105, CT2≈150C_{T_2}\approx 150CT2​​≈150), enabling the generation of non-classical states and the investigation of mechanisms underlying mechanical decoherence. We show that dynamical decoupling$\unicode{x2014}$implemented through the qubit$\unicode{x2014}$can mitigate decoherence, leading to a mechanical coherence time of T2≈1 msT_2\approx 1 \text{ ms}T2​≈1 ms. These findings extend the exceptional storage capabilities of mechanical oscillators to the quantum regime, putting them forward as compact bosonic elements for future applications in quantum computing and metrology.
We demonstrate a memory for light based on optomechanically induced transparency. We achieve a long storage time by leveraging the ultra-low dissipation of a soft-clamped mechanical membrane resonator, which oscillates at MHz frequencies. At room temperature, we demonstrate a lifetime T1≈23 msT_1 \approx 23\,\mathrm{ms}T1​≈23ms and a retrieval efficiency η≈40%η\approx 40\%η≈40% for classical coherent pulses. We anticipate storage of quantum light to be possible at moderate cryogenic conditions (T≈10 KT\approx 10\,\mathrm{K}T≈10K). Such systems could find applications in emerging quantum networks, where they can serve as long-lived optical quantum memories by storing optical information in a phononic mode.