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Diamond optomechanics for coherent manipulation of light (Conference Presentation)

Paul E. Barclay

Published Mar 10, 2020• 0 citations
Publisher

Abstract

Diamond cavity optomechanical devices enable coherent conversion of information between optical and mechanical domains, thanks to a combination of low optical and mechanical loss, the ability to support intense optical fields without suffering from multi-photon optical absorption, and enhanced optomechanical coupling arising from nanoscale device geometry. In this talk we will review our progress in using these devices to create optical memories, wavelength conversion devices, and phase sensitive all-optical switches.

DOI
10.1117/12.2550371

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Diamond cavity optomechanical devices enable coherent conversion of information between optical and mechanical domains, thanks to a combination of low optical and mechanical loss, the ability to support intense optical fields without suffering from multi-photon optical absorption, and enhanced optomechanical coupling arising from nanoscale device geometry. In this talk we will review our progress in using these devices to create optical memories, wavelength conversion devices, and phase sensitive all-optical switches.
The polarizations of optical fields, besides field intensities, provide more degrees of freedom to manipulate coherent light-matter interactions. Here we propose how to achieve a coherent switch of optomechanical entanglement in a polarized-light-driven cavity system. We show that by tuning the polarizations of the driving field, the effective optomechanical coupling can be well controlled and, as a result, quantum entanglement between the mechanical oscillator and the optical transverse electric (TE) mode can be coherently and reversibly switched to that between the same phonon mode and the optical transverse magnetic (TM) mode. This ability of switching optomechanical entanglement with such a vectorial device can be important for building a quantum network being capable of efficient quantum information interchanges between processing nodes and flying photons.
The quantum level interaction between light and mechanical systems has become a cutting-edge research with broad implications for fundamental physics, quantum information processing, and sensing. Quantum optomechanical systems allow for the precise control and modulation of light-matter interactions by coupling photons with mechanical resonators. Novel approaches to the manipulation of light and matter quantum states have been made possible by recent developments in the fabrication of ultra-sensitive mechanical devices and the achievement of strong coupling regimes. the most recent advancements in quantum optomechanics, such as the realization of non-classical states of light and mechanical motion, the improvement of quantum coherence, and the cooling of mechanical systems to their quantum ground state. possible uses in quantum memory, extremely accurate measurement systems, and basic quantum mechanical experiments. In order to create more reliable and scalable quantum networks, the study concludes by outlining potential future avenues for combining quantum optomechanical systems with other quantum technologies.
Quantum optomechanical technologies benefit from mechanical oscillators that are high-frequency, can be coherently driven, and are capable of coupling to other quantum systems. Diamond supports all of these criteria: its large elastic modulus increases mechanical resonance frequency, its low nonlinear optical absorption increases the allowed intensity of fields used for coherent optomechanics, and it hosts spin qubits that interact with mechanical modes. Here we demonstrate a diamond optomechanical crystal cavity that supports multiple mechanical resonances with $\sim$12 GHz frequency and high Qm×fmQ_\text{m} \times f_\text{m}Qm​×fm​ product that can be coherently coupled to multiple optical modes. By exciting this sideband resolved system into mechanical self-sustained oscillations, we generate a frequency comb spanning 143 GHz. Analysis of the comb spectrum, combined with systematic characterization of the system's optomechanical coupling, allows us to quantitatively show that its mechanical oscillation amplitude reaches 130 pm. This corresponds to a maximum total dynamic strain of 1.1×10−31.1 \times 10^{-3}1.1×10−3 that is sufficiently high for future demonstrations of optomechanical control of diamond spin qubits.
The polarizations of optical fields, besides field intensities, provide more degrees of freedom to manipulate coherent light-matter interactions. Here, we propose how to achieve a coherent switch of optomechanical entanglement in a polarized-light-driven cavity system. We show that by tuning the polarizations of the driving field, the effective optomechanical coupling can be well controlled and, as a result, quantum entanglement between the mechanical oscillator and the optical transverse electric mode can be coherently and reversibly switched to that between the same phonon mode and the optical transverse magnetic mode. This ability to switch optomechanical entanglement with such a vectorial device can be important for building a quantum network being capable of efficient quantum information interchanges between processing nodes and flying photons.
Multimode cavity optomechanical systems allow light to couple otherwise non-interacting mechanical resonators, enabling non-Hermitian phenomena such as exceptional points, where eigenfrequencies and eigenvectors of coupled modes coalesce. Accessing an exceptional point and its nearby parameter space is a first step towards chiral mode dynamics and topological state transfer. Diamond optomechanical devices support strong coherent optomechanical coupling required to tune resonances to an exceptional point, as well as strain-coupling to spin-defects for hybrid quantum technologies, but have not yet been used for multimode non-Hermitian physics. Here we tune to an exceptional point in a diamond optomechanical crystal, which uses structural symmetry breaking to produce two high-frequency mechanical resonances coupled to an optical cavity. The exceptional point is reached within a stable operating window below the phonon-lasing threshold, and we observe asymmetric redistribution of optomechanical damping and anti-damping between hybridized modes. These results establish diamond optomechanical crystals as a platform for non-Hermitian optomechanics, opening routes to topological mechanical dynamics in hybrid spin-phonon interfaces.
Integrated photonic devices in diamond have tremendous potential for many quantum applications, including long-distance quantum communication, quantum information processing, and quantum sensing. These devices benefit from diamond's combination of exceptional thermal, optical, and mechanical properties. Its wide electronic bandgap makes diamond an ideal host for a variety of optical active spin qubits that are key building blocks for quantum technologies. In landmark experiments, diamond spin qubits have enabled demonstrations of remote entanglement, memory-enhanced quantum communication, and multi-qubit spin registers with fault-tolerant quantum error correction, leading to the realization of multinode quantum networks. These advances put diamond at the forefront of solid-state material platforms for quantum information processing. Recent developments in diamond nanofabrication techniques provide a promising route to further scaling of these landmark experiments towards real-life quantum technologies. In this paper, we focus on the recent progress in creating integrated diamond quantum photonic devices, with particular emphasis on spin-photon interfaces, cavity optomechanical devices, and spin-phonon transduction. Finally, we discuss prospects and remaining challenges for the use of diamond in scalable quantum technologies.