A Long-lived and Efficient Optomechanical Memory for Light

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 \(T_1 \approx 23\,\mathrm{ms}\) and a retrieval efficiency \(\eta \approx 40\%\) for classical coherent pulses. We anticipate storage of quantum light to be possible at moderate cryogenic conditions (\(T\approx 10\,\mathrm{K}\)). 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.