|Quantum Computation & Simulation||Quantum Communication||Quantum Meteorology & Sensing||Fundamental Research|
*To scale superconducting qubits some photonic link ideas have been demonstrated.
Not an exhaustive list
One advantage is that photons are easy to manipulate using standard components like phase shifters and beam splitters. Networking of quantum computer hardware like photonic chips or ion-trapped modules is slightly easier when utilizing photonics since there is no need for transducers. Photonic components are embedded in the hardware, so it is easier to transport quantum information from one chip to another via optical fibers. One of the scaling architectures currently being investigated for trapped ions, a quantum computing qubit modality that uses photonics, is a network of ion-trapped modules which are linked via optical fibers . The ability to network and transport information is vital to overcome challenges like scaling.
For quantum communication that requires sending information over long distances like a quantum network, the photon has demonstrated itself as a reliable carrier of information as it has been tried and tested in other fields such as optical fiber networks.
Quantum sensing exploits quantum systems’ extreme sensitivity to environmental factors to measure physical properties with more precision .
One of the areas of active research in quantum sensing involves nitrogen vacancies (NV). NVs can act as high-sensitivity probes of magnetic fields, electric fields, charge, voltage, and pressure. NVs have attractive properties that include long coherence times on the order of milliseconds at room temperature.
Examples of photonic components used in NV:
Figure 1. Experimental setup using nitrogen vacancy
Check out some of our past webinars.
Another resource is WIRED Magazine's video on quantum sensing, presented by Prof. Chandrasekhar Ramanathan of Dartmouth College.
 Brown, K., Kim, J. & Monroe, C. Co-designing a scalable quantum computer with trapped atomic ions. npj Quantum Inf 2, 16034 (2016). https://doi.org/10.1038/npjqi.2016.34.
 T. Hausken et al., “OIDA Quantum Photonics Roadmap,” OSA Industry Development Associates Report, 2020.
 M. Barbiero, S. Castelletto, and M. Gu, “Multi-focal laser fabrication of nitrogen vacancy centres in a bulk diamond,” OSA Continuum 3(12), 3416–3423 (2020).
 F. M. Stürner et al., “Integrated and portable magnetometer based on nitrogen-vacancy ensembles in diamond,” Adv. Quantum Technol., vol. 4, no. 4, Apr. 2021, Art. no. 2000111.
 Jeong Hyun Shim, Seong-Joo Lee, Santosh Ghimire, Ju Il Hwang, Kwang-Geol Lee, Kiwoong Kim, Matthew J. Turner, Connor A. Hart, Ronald L. Walsworth, and Sangwon Oh. Multiplexed sensing of magnetic field and temperature in real time using a nitrogen vacancy spin ensemble in diamond. Phys. Rev. Applied, 17(1):014009, January 2022.
 Chen Y, Balasubramanian P, Cai Y, et al. Quantum calibration of multi-pixel photon counter and its application in high-sensitivity magnetometry with NV center ensemble. IEEE J Sel Top Quantum Electron. 2020;26(3):1-7. https://doi.org/10.1109/JSTQE.2020.2991432.
 Basso L., Sacco M., Bazzanella N., Cazzanelli M., Barge A., Orlandi M., Bifone A., Miotello A. Laser-Synthesis of NV-Centers-Enriched Nanodiamonds: Effect of Different Nitrogen Sources. Micromachines. 2020;11:579. doi: 10.3390/mi11060579
Klea Dhimitri is an applications engineer out of Hamamatsu’s office in Bridgewater, NJ, where she focuses on product offerings for emerging quantum technology applications that utilize photonics. Her expertise includes photodetectors such as photomultiplier tubes (PMTs), SPPC (SPAD), MPPC (SiPM), photodiodes, and avalanche photodiodes (APD), as well as their role in quantum applications. Klea leads Hamamatsu's efforts in bringing our R&D from Japan together with researchers and early adopters in North America to provide a range of photonic solutions, from detectors to light modulators to cameras, for the current and future quantum landscape. She also manages Hamamatsu Corporation’s engagement and activities in North American quantum hubs like Chicago Quantum Exchange (CQE). In her spare time, she enjoys endurance-based sports such as running and biking, and is currently training to run her first marathon in the fall.
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