Quantum Entanglement Applications

Scientists Discover New Method to Entangle Light and Sound Researchers at the Max Planck Institute for the Science of Light (MPL) have unveiled a groundbreaking technique for entangling photons (quanta of light) with acoustic phonons (traveling sound waves). Published in Physical Review Letters, this study demonstrates a robust method of creating quantum entanglement that resists external noise—overcoming a significant challenge in advancing quantum technologies. Why It Matters Quantum entanglement, where particles are interconnected so the state of one influences the other regardless of distance, is fundamental to many emerging technologies, including: • Secure Quantum Communications: Enhancing encryption through unbreakable quantum protocols. • High-Dimensional Quantum Computing: Enabling advanced computational systems capable of solving complex problems. While photon entanglement is well-established, entangling photons with phonons presents unique advantages, particularly in bridging fast optical signals with slower, localized acoustic waves. Breakthrough in Optoacoustic Entanglement The MPL team developed a new optoacoustic entanglement scheme that pairs photons with phonons. Key highlights include: 1. Enhanced Robustness: The entanglement demonstrated resistance to external noise, addressing a critical limitation of most quantum systems. 2. Efficient Coupling: By leveraging nonlinear optical methods, scientists efficiently linked the fast propagation of photons with the localized nature of phonons. 3. Versatility: This approach enables the transfer of quantum information between light and sound, creating a hybrid platform for various quantum applications. Applications of Light-Sound Entanglement 1. Quantum Memory: Phonons, with their slower speeds and longer lifetimes, can act as quantum storage for information carried by photons. 2. Hybrid Quantum Networks: Connecting quantum systems operating at different scales, such as optical and mechanical devices. 3. Resilient Quantum Devices: Building systems that are less prone to environmental disturbances, enabling practical quantum computing and communication technologies. Future Implications The ability to entangle light and sound opens the door to: • Integrating quantum technologies with classical systems. • Developing ultra-stable quantum networks that operate across varying mediums. • Expanding the range of materials and mechanisms available for quantum device engineering. This breakthrough represents a critical step toward scalable and resilient quantum systems, bridging the gap between fast optical data transmission and long-lived acoustic storage. It highlights the transformative potential of interdisciplinary quantum research.

Breakthrough for the #quantum internet: For the first time a major telco provider has successfully conducted entangled photon experiments - on its own infrastructure. ➡️ 30 kilometers, 17 days, 99 per cent fidelity. Our teams at T-Labs have successfully transmitted entangled photons over a fiber-optic network. Over a distance comparable to travelling from Berlin to Potsdam. The system automatically compensated for changing environmental conditions in the network.   Together with our partner Qunnect we have demonstrated that quantum entanglement works reliably. The goal: a quantum internet that supports applications beyond secure point-to-point networks. Therefore, it is necessary to distribute the types of entangled photons. The so-called qubits, that are used for #QuantumComputing, sensors or memory. Polarization qubits, like the ones used for this test, are highly compatible with many quantum devices. But: they are difficult to stabilize in fibers.   From the lab to the streets of Berlin: This success is a decisive step towards the quantum internet. 🔬 It shows how existing telecommunications infrastructure can support the quantum technologies of tomorrow. This opens the door to new forms of communication.   Why does this matter for people and society?   🗨️ Improved communications: The quantum internet promises faster and more efficient long-distance communications. 🔐 Maximum security: Entanglement can be used in quantum key distribution protocols. Enabling ultra-secure communication links for enterprises and government institutions 💡Technological advancement: high-precision time synchronization for satellite networks and highly accurate sensing in industrial IoT environments will need entanglement.   Developing quantum technologies isn’t just a technical challenge. A #humancentered approach asks how these systems can be built to serve real needs and be part of everyday infrastructure. With 2025 designated as the International Year of Quantum Science and Technology, now is the time to move from research to readiness. Matheus Sena, Marc Geitz, Riccardo Pascotto, Dr. Oliver Holschke, Abdu Mudesir

India just crossed a major milestone in the race for quantum-secure communication — and it's not science fiction anymore. DRDO & IIT Delhi have successfully demonstrated Quantum Entanglement-Based Free-Space Secure Communication — over 1 km using an optical link on campus. Here’s why these matters: 1) Entangled photons were used to create secure cryptographic keys 2) No optical fiber needed — it worked over free space. 3) Achieved ~240 bits/sec secure key rate. 4) Quantum Bit Error Rate was below 7%. So, what’s the big deal? 1) It proves that we can build secure communication systems without needing underground cables — perfect for difficult terrains, defense zones, or remote areas. 2) Even if someone tries to intercept the message, the quantum state changes — making the intrusion detectable. 3) It’s another step toward building the Quantum Internet in India. The work was led by Prof. Bhaskar Kanseri’s team at IIT Delhi and supported by DRDO under its “Centres of Excellence” initiative. #QuantumComputing #QuantumCommunication #DRDO #IITDelhi #QuantumIndia #QuantumSecurity #Photonics #Research #QuantumInternet

Check out the latest from MIT EQuS and Lincoln Laboratory published in @NaturePhysics! In this work, we demonstrate a quantum interconnect using a waveguide to connect two superconducting, multi-qubit modules located in separate microwave packages. We emit and absorb microwave photons on demand and in a chosen direction between these modules using quantum entanglement and quantum interference. To optimize the emission and absorption protocol, we use a reinforcement learning algorithm to shape the photon for maximal absorption efficiency, exceeding 60% in both directions. By halting the emission process halfway through its duration, we generate remote entanglement between modules in the form of a four-qubit W state with concurrence exceeding 60%. This quantum network architecture enables all-to-all connectivity between non-local processors for modular, distributed, and extensible quantum computation. Read the full paper here: https://lnkd.in/eN4MagvU (paywall), view-only link https://rdcu.be/eeuBF, or arXiv https://lnkd.in/ez3Xz7KT. See also the related MIT News article: https://lnkd.in/e_4pv8cs. Congratulations Aziza Almanakly, Beatriz Yankelevich, and all co-authors with the MIT EQuS Group and MIT Lincoln Laboratory! Massachusetts Institute of Technology, MIT Center for Quantum Engineering, MIT EECS, MIT Department of Physics, MIT School of Engineering, MIT School of Science, Research Laboratory of Electronics at MIT, MIT Lincoln Laboratory, MIT xPRO, Will Oliver

World’s first quantum battery has done something no battery in history has ever achieved: the bigger it gets, the faster it charges, flipping classical physics upside down. Unlike traditional batteries, where charging slows as size increases, quantum batteries exploit entanglement and collective effects among particles, allowing energy to be absorbed simultaneously by all components. This effect dramatically reduces charging time and opens new possibilities for large-scale energy storage, ultra-fast electronics, and future quantum devices that require rapid power delivery. By demonstrating that quantum effects can fundamentally change how energy storage works, researchers are challenging long-held assumptions and revealing the untapped potential of quantum mechanics in practical technology. The quantum battery shows that the rules we take for granted in classical physics can be rewritten at the quantum scale, hinting at a future where energy systems are faster, smarter, and far more efficient.

Title: Revolutionizing PET Imaging: The Power of Photon Entanglement Main Text: Did you know that every time a positron annihilation occurs in PET imaging, the two 511 keV photons produced are quantum entangled? In traditional PET, we detect coincidences based only on timing and position. But the deeper quantum reality tells us: these photons are also linked in their polarization states! Photon entanglement means that their properties are correlated, even across large distances. Recent research shows that by analyzing this entanglement: We can reject scattered and random events more effectively. We can enhance image contrast and resolution. We can lower patient radiation doses or reduce scan times. Quantum-Enhanced PET (QE-PET) could be the future — combining quantum physics and advanced detector technologies (like CZT detectors) to achieve cleaner, sharper, and faster PET imaging. Imagine a PET system that not only knows when two photons arrived… but also knows if they were "born together". The future of molecular imaging is not just about faster or higher resolution — it's about smarter physics. #PET #QuantumPhysics #MedicalImaging #MolecularImaging #PhotonEntanglement #HealthcareInnovation --- Infographic Points (to design below): 1. Title: PET Imaging & Photon Entanglement 2. What Happens in PET? Positron meets electron. Two 511 keV photons are emitted — entangled! 3. Traditional PET: Detects photons based on timing. Accepts some noise (scatter and randoms). 4. Quantum-Enhanced PET: Detects timing and polarization entanglement. Rejects scatter and randoms more precisely. 5. Benefits: Sharper images. Lower radiation dose. Shorter scanning time. 6. How it works: CZT detectors measure Compton scatter patterns. Quantum analysis confirms true annihilation events. 7. The Future: Combining quantum physics with AI-driven PET systems. Toward smarter, safer molecular imaging! https://lnkd.in/eshp7Kny

Chinese engineers built a quantum radar system detecting stealth aircraft through any atmospheric condition reliably — a development with profound implications for global military technology balance, the future of stealth aviation, and the broader quantum sensing industry. The advantage that stealth technology has provided for 40 years may be approaching its technological ceiling. 🔬 Conventional radar works by emitting electromagnetic pulses and detecting their reflection from targets. Stealth aircraft defeat this by using radar-absorbing materials, geometric designs that scatter reflections away from the source radar, and electronic countermeasures that confuse or jam receiver systems. Quantum radar operates on an entirely different physical principle: it uses entangled photon pairs, where one photon is sent toward the target and the other is retained at the receiver. Because entangled photons share a quantum state regardless of distance, the retained photon provides a reference that allows the system to distinguish the genuine reflection of the sent photon from background noise — even when the reflected signal is billions of times weaker than conventional radar sensitivity thresholds. The system developed at the National University of Defense Technology in China demonstrated the ability to detect targets with radar cross-sections as small as 0.001 square meters — the cross-section of advanced stealth aircraft like the F-35 and B-21 — at ranges exceeding 150 kilometers, with performance unaffected by atmospheric conditions including heavy precipitation that degrades conventional radar. Electronic jamming was also found to be ineffective because the entanglement correlation cannot be mimicked by conventional radio frequency interference. 🌏 Whether this technology reshapes military balance or primarily drives quantum sensing applications in civilian medicine and environmental monitoring, the physics it demonstrated is real and consequential. Source: National University of Defense Technology, China, Physical Review Applied 2025

Quantum Entanglement meets Astronomy: our paper "Entanglement-assisted non-local optical interferometry in a quantum network" has been published in Nature! 🎉 https://lnkd.in/gy8u_wR7 We demonstrate how distributed quantum entanglement and quantum memories can enhance the sensitivity of non-local optical measurements — bridging quantum networks, sensing, and computing in a single experiment. The platform: a two-node quantum network built from Silicon-Vacancy centres in diamond nanophotonic chips. Using long-distance entanglement as a resource, we perform non-local phase measurements of signals at the single-photon level, overcoming fundamental limits of classical interferometry. One exciting application: telescope arrays observing faint astronomical objects could one day benefit from exactly this kind of entanglement-enhanced distributed sensing. A big congrats to the team!! — Pieter-Jan Stas , Yan-Cheng Wei, Maxim Sirotin, Yan Qi Huan, Umut Yazlar, Francisca Abdo Arias, Eugene Knyazev, Gefen Baranes, Bart Machielse, Samuele Grandi, Daniel Riedel, Johannes Borregaard, Hongkun Park, Marko Loncar, and Misha Lukin!