Important Research in Photonic Sensing during 2022
Here is a sampling of seven ground-breaking papers regarding photonic sensing published this year from researchers around the world.
All this research used one or more of the following ID Quantique products:
- ID281 Superconducting Nanowire Series Detectors
- ID230 Infrared Single-Photon Detectors
- Time Controller Series Devices
- ID220 Single Photon Counters (precursors to the
ID Qube NIR Series)
Below are summaries and links for each of these papers:
- Linking silicon qubits to photonic qubits: At the heart of the Quantum Internet lies the ability to interconvert flying photonic qubits (fast and far-reaching) and matter-based qubits (stationary and useful). Recently, researchers at Simon Fraser University were able to optically address the spin-qubits of their silicon-based devices with photons in the telecom O band. This is a foundational opportunity to develop some of the key infrastructure components for future scalable and high-performance quantum telecommunication infrastructure. (Paper: “Optical observation of single spins in silicon”)
- Increasing laser power without sacrificing size: Scaling up the power of a laser isn’t generally feasible without harming the coherence of the laser light, where desired single modes are overcome by higher-order transverse modes as the cavity size increases. Researchers at UC Berkeley and the Berkeley Lab have been able to demonstrate a novel laser cavity design, where its unconventional behavior is exploited to allow larger and larger lasers to operate. This work opens a range of applications and avenues of investigation in light-matter interaction and cavity quantum electrodynamics. (Paper: “Scalable single-mode surface emitting laser via open-Dirac singularities”)
- Advances in fiber-integrated quantum memories: Photons can be hard to steer without destroying their useful quantum coherence properties, so the investigation of quantum memories for “buffering” photonic states is important for future quantum computing and communication architectures. In this work, researchers at ICFO, IFN-CNR and Heriot-Watt University demonstrate entanglement between a fiber-integrated quantum memory and a telecommunications-wavelength photon, an important stepping stone for long-distance quantum communication. (Paper: “Storage and analysis of light-matter entanglement in a fiber-integrated system”)
- Single-photon control with quantum memories: While fiber-integration is important for quantum memories to be useful, they must also have sufficiently precise and efficient storage and reading out of their photonic inputs. Researchers at ICFO in Spain demonstrate the storage and retrieval of single photons in a low-noise Raman quantum memory. (Paper: “Raman Storage of Quasideterministic Single Photons Generated by Rydberg Collective Excitations in a Low-Noise Quantum Memory”)
- Simultaneous pairwise QKD: Researchers at the Technical University of Darmstadt have demonstrated a scalable star-shaped QKD network, with an entanglement-based protocol involving simultaneous key exchanges between four participants. (Paper: “Scalable Network for Simultaneous Pairwise Quantum Key Distribution via Entanglement-Based Time-Bin Coding”)
- Exploiting quantum asymmetry: Like quantum coherence, quantum asymmetry is a physical resource that can increase the sensitivity of measuring equipment. In this work, researchers at the University of Warsaw demonstrate an interferometric experiment that sees an increase in sensitivity despite a decrease in correlation between the reference signal fluctuations. (Paper: “Quantum Asymmetry and Noisy Multimode Interferometry”)
- Scalable and high-capacity quantum light sources: As a resource for quantum computation and communication, the photon pairs generated with time-frequency entanglement are relatively easy to generate, and have a high capacity for encoding information. Researchers at the University of Oregon demonstrated this in a versatile and scalable entanglement swapping experiment, which required no special source engineering. (Paper: “Spectrally resolved four-photon interference of time-frequency-entangled photons”)
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