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IEEE Electron Devices Technology & Manufacturing Conference (EDTM)

Microwave Coherent Storage Based on the Long Lifetime Cavity Electromechanical System

Tiefu Li

Published Mar 9, 2025• 0 citations
Publisher

Abstract

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.

DOI
10.1109/edtm61175.2025.11041110

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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.
Abstract Mechanical resonators, due to their capability to host ultralong-lived phonon modes, are particularly attractive for quantum state storage and as memory elements in conjunction with quantum computing and communication networks. Here we demonstrate absorptive-type coherent memory based on long-lived mechanical excitations. The itinerant coherent microwave field is captured, stored, and retrieved from a mechanical memory oscillator which is pre-cooled to the ground state. The phase space distribution allows us to distinguish between coherent and thermal components and study their evolution as a function of storage time. Our device exhibits attractive functions with an energy decay time of T 1 = 15.9 s, a thermal decoherence rate of Γ th = 2.85 Hz, and acquires less than one quantum noise during the τ coh = 55.7 ms storage period. We demonstrate that both the amplitude and phase information of microwave coherent states can be recovered, indicating the coherence of our memory device. These results suggest that high- Q mechanical resonators and long coherence time phonons could be ideal candidates for the construction of long-lived and on-demand microwave quantum memories.
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.
We demonstrate a memory for light based on optomechanically induced transparency. We achieve a long storage time by leveraging the ultralow dissipation of a soft-clamped mechanical membrane resonator, which oscillates at MHz frequencies. At room temperature, we demonstrate a lifetime ${T}_{1}\ensuremath{\approx}23\text{ }\text{ }\mathrm{ms}$ and a retrieval efficiency $\ensuremath{\eta}\ensuremath{\approx}40%$ for classical coherent pulses. We anticipate the storage of quantum light to be possible at moderate cryogenic conditions ($T\ensuremath{\approx}10\text{ }\text{ }\mathrm{K}$). 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.
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.
Superconducting 3D microwave cavities offer state-of-the-art coherence times and a well controlled environment for superconducting qubits. In order to realize at the same time fast readout and long-lived quantum information storage, one can couple the qubit both to a low-quality readout and a high-quality storage cavity. However, such systems are bulky compared to their less coherent 2D counterparts. A more compact and scalable approach is achieved by making use of the multimode structure of a 3D cavity. In our work, we investigate such a device where a transmon qubit is capacitively coupled to two modes of a single 3D cavity. The external coupling is engineered so that the memory mode has an about 100 times larger quality factor than the readout mode. Using an all-microwave second-order protocol, we realize a lifetime enhancement of the stored state over the qubit lifetime by a factor of 666 with a ZZZ-fidelity of 82%82\%82%. We also find that this enhancement is not limited by fundamental constraints.
Superconducting 3D microwave cavities offer state-of-the-art coherence times and a well-controlled environment for superconducting qubits. In order to realize at the same time fast readout and long-lived quantum information storage, one can couple the qubit to both a low-quality readout and a high-quality storage cavity. However, such systems are bulky compared to their less coherent 2D counterparts. A more compact and scalable approach is achieved by making use of the multimode structure of a 3D cavity. In our work, we investigate such a device where a transmon qubit is capacitively coupled to two modes of a single 3D cavity. External coupling is engineered so that the memory mode has an about 100 times larger quality factor than the readout mode. Using an all-microwave second-order protocol, we realize a lifetime enhancement of the stored state over the qubit lifetime by a factor of 6 with a fidelity of approximately 80% determined via quantum process tomography. We also find that this enhancement is not limited by fundamental constraints.