Optomechanical devices sensitively transduce and actuate motion of nanomechanical structures using light. Single-crystal diamond promises to improve the performance of optomechanical devices, while also providing opportunities to interface nanomechanics with diamond color center spins and related quantum technologies. Here we demonstrate dissipative waveguide-optomechanical coupling exceeding 35 GHz/nm to diamond nanobeams supporting both optical waveguide modes and mechanical resonances, and use this optomechanical coupling to measure nanobeam displacement with a sensitivity of 9.5 fm/ √ Hz and optical bandwidth > 150nm. The nanobeams are fabricated from bulk optical grade single-crystal diamond using a scalable undercut etching process, and support mechanical resonances with quality factor 2.5 × 10 5 at room temperature, and 7.2 × 10 5 in cryogenic conditions (5K). Mechanical self-oscillations, resulting from interplay between photothermal and optomechanical effects, are observed with amplitude exceeding 200 nm for sub-µW absorbed optical power, demonstrating the potential for optomechanical excitation and manipulation of diamond nanomechanical structures.

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The implementation of quantum networks involving quantum memories and photonic channels without the need for cryogenics would be a major technological breakthrough. Nitrogen-vacancy centers have excellent spin properties even at room temperature, but phonon-induced broadening makes it challenging to coherently interface these spins with photons at non-cryogenic temperatures. Inspired by recent progress in achieving high mechanical quality factors, we propose that this challenge can be overcome using spin-optomechanical transduction. We quantify the coherence of the interface by calculating the indistinguishability and purity of single photons emitted from such a device and describe promising paths towards experimental implementation. Our results show that for ultra-high mechanical quality factor-frequency products, as have recently been achieved, our proposed interface could generate single photons with high indistinguishability, purity, and efficiency at room temperature-an important step towards room-temperature quantum networks.

We study the entanglement generated by a weak cross-Kerr nonlinearity between two initial coherent states, one of which has an amplitude close to the single-photon level, while the other one is macroscopic. We show that strong micro-macro entanglement is possible for weak phase shifts by choosing the amplitude of the macroscopic beam sufficiently large. We analyze the effects of loss and discuss possible experimental demonstrations of the micro-macro entanglement based on homodyne tomography and on a new entanglement witness

We present an optomechanical device designed to allow optical transduction of orbital angular momentum of light. An optically induced twist imparted on the device by light is detected using an integrated cavity optomechanical system based on a nanobeam slot-mode photonic crystal cavity. This device could allow measurement of the orbital angular momentum of light when photons are absorbed by the mechanical element, or detection of the presence of photons when they are scattered into new orbital angular momentum states by a sub-wavelength grating patterned on the device. Such a system allows detection of a l = 1 orbital angular momentum field with an average power of 3.9 × 10 3 photons modulated at the mechanical resonance frequency of the device and can be extended to higher order orbital angular momentum states.PACS numbers: