Perspective on Solid‐State Single‐Photon Sources in the Infrared for Quantum Technology

Abstract

Solid‐state single‐photon sources in the infrared region are crucial for advancing quantum technologies, in particular long‐distance fiber or on‐chip quantum communication, quantum key distribution, quantum computing, quantum sensing and metrology, and fundamental research. The ability to generate and manipulate individual photons in the infrared spectrum is an area of expansion due to the availability of advanced material quality or new emerging materials. The latest advancements in the discovery and utilization of single‐photon sources in various material platforms and their foreseeable future development are here summarized.

Gallium Nitride Nanomaterials and Color Centers for Quantum Technologies

“…Both SPSs and optical spin-read-out systems are building blocks for quantum technologies such as quantum communication and computation (SPSs and spin-qubits); 11,18 the spinoptical read-out can be used for quantum sensing 19 and bright single-photon emission can be used for quantum radiometry. 20 The availability of RE doping in GaN opens the opportunity to have in the same material quantum memories, 21 while spin shows a dip at g (2) (0) ∼ 0 in the case the stream of photons is made of separate single photons (antibunching), in contrast with coherent light (random distribution of photons arrivals) with a g (2) (0) = 1 or a classical light with g (2) (0) > 1 (bunching).…”

“…Both SPSs and optical spin-read-out systems are building blocks for quantum technologies such as quantum communication and computation (SPSs and spin-qubits); , the spin-optical read-out can be used for quantum sensing and bright single-photon emission can be used for quantum radiometry . The availability of RE doping in GaN opens the opportunity to have in the same material quantum memories, while spin defect coherent control could open the opportunity to explore spin-qubits in this material and spin-photon entanglement distribution , if the spin coherence will be determined to be long enough.…”

Quantum Sensing for the Cities of the Future

“…Quantum sensing bears many benefits compared to the conventional manner of sensing by promising to surpass the restrictions of the usual sensing methods (Vashist, 2023;Castelletto, 2023).…”

“…The spatial control of fluorescent colloidal nanodiamonds illustrates the flexibility of quantum sensors to achieve accurate and localized measurements (Vashist, 2023). The advancement of the solid-state single-photon sources at the infrared region is expected to improve the performance of quantum sensing applications (Castelletto, 2023).…”

Room temperature optical coupling of neodymium ions to photonic crystal L3 cavity in gallium nitride semiconductor

“…[6][7][8] They can also be integrated with nanophotonic devices to enhance photon emission and attain strong lightmatter interactions. 9) Recently, significant progress has been made in the nanophotonic integration of solid-state qubits, including color centers in diamond and SiC, 1,10,11) quantum dots, 12,13) and lanthanoid ions. 14) Isolated lanthanoid (Ln) ions in a crystal are a promising candidate for SPSs and qubits because of their superior photon emission properties and long spin coherence times.…”