Hybrid diamond quantum photonics

Tsung‐Ju Lu, Noel Wan, Kevin C. Chen +8 more

Assegid M. Flatae, Florian Sledz, Haritha Kambalathmana +8 more

Single-color centers in thin polycrystalline diamond membranes allow the platform to be used in integrated quantum photonics, hybrid quantum systems, and other complex functional materials. While single-crystal diamond membranes are still technologically challenging to fabricate as they cannot be grown on a non-diamond substrate, free-standing polycrystalline diamond membranes can be conveniently fabricated at large-scale from nanocrystalline diamond seeds on a substrate that can be selectively etched. However, their practical application for quantum photonics is so far limited by crystallographic defects, impurities, graphitic grain boundaries, small grain sizes, scattering loss, and strain. In this paper, we report on a single-photon source based on silicon-vacancy color centers in a polycrystalline diamond membrane. We discuss the spectroscopic approach and quantify the photon statistics, obtaining a g2(0) ≈ 0.04. Our findings hold promise for introducing polycrystalline diamond to quantum photonics and hybrid quantum systems.

Lin Jin, Wolfram H. P. Pernice

Constantin Dory, Dries Vercruysse, Ki Youl Yang +9 more

Ryota Katsumi, Kosuke Takada, Fedor Jelezko +1 more

Point defects in diamond, particularly nitrogen-vacancy (NV) centers, have emerged as powerful tools for a broad range of quantum technologies. These defects are promising candidates for quantum information science, serving as deterministic single-photon sources and solid-state quantum memories. They have also been employed as nanoscale quantum sensors to detect various physical quantities, including magnetic fields, electric fields, and temperature, owing to their long spin coherence time at room temperature. Development of these diamond-based quantum technologies has been rapidly boosted by a recent quantum leap in nanofabrication technologies for high-quality single-crystal diamond. Incorporating these color centers into diamond nanostructures with mature integrated photonics provides a promising route to build scalable and practical systems for quantum applications. This review discusses recent progress and challenges in the hybrid integration of diamond color centers on cutting-edge photonic platforms. Nitrogen-vacancy centers in diamond have emerged as powerful tools for a broad range of quantum technologies. This review discusses recent progress and challenges in the hybrid integration of diamond color centers on cutting-edge photonic platforms.

Brant C. Gibson, Stefania Castelletto, Timothy J Karle +11 more

Diamond is emerging as an optical supermaterial, due to its wide transparency bandwidth, excellent thermooptic properties and most notably its stable, large dipole moment, room temperature, single photon emitting colour centres. In this paper we present recent progress in the characterization of non radiative and radiative decay in single impurities and the fabrication of hybrid diamond-tellurite optical structures.. First, we present direct imaging of the emission pattern of individual ion implanted chromium-based single photon emitters in diamond and measure their quantum efficiency. By comparing the decay rates from the single chromium emitters at different depths in the diamond crystal, we measured an average quantum efficiency of 28%. Second, a hybrid approach involving a soft glass tellurite host material has been introduced, allowing nitrogen-vacancy (NV-) diamond emitters to be built into an optical fibre. The potential of integrating Cr-related centres in hybrid optical structures is also discussed.