This paper proposes a #stacked #intelligent #metasurfaces (#SIM)-aided #downlink #multiuser transmission scheme, where the SIM at the #base #station (#BS) is designed by combining nearly passive layers, i.e., with phase-only reconfiguration capabilities, and active layers integrated with amplifier chips to enable amplitude control. Their design aims at maximizing the sum rate for the best group of users by jointly optimizing the transmit #power #allocation at the BS and the #wave-#based #beamforming at the SIM. ---- Donatella Darsena, Francesco Verde, Ivan Iudice, Vincenzo Galdi More details can be found at this link: https://lnkd.in/eZ9CPXkb

This paper investigates the impact of #flexible #intelligent #metasurface (#FIM) on #wireless #sensing performance. Specifically, the authors focus on the maximization of the cumulated power of the probing signals at the target locations under the per-antenna power constraint by jointly optimizing the transmit covariance matrix and the surface shape of the transmitting FIM. They propose a #block #coordinate #descend (#BCD) algorithm to find a locally optimal solution, by alternatively updating the FIM surface shape and the transmit covariance matrix, while keeping the other one fixed at each step. Furthermore, they analyze the computational complexity and convergence properties of the proposed algorithm and demonstrate that FIM enhances wireless sensing by providing a new design degree-of-freedom to coordinate the correlation between steering vectors at different angles. ---- Zihao Teng, Jiancheng An, Lu Gan, Naofal Al-Dhahir, Zhu Han More details can be found at this link: https://lnkd.in/d_2vHASP

This paper introduces a novel #stacked #intelligent #metasurface (#SIM) design. Specifically, they investigate the integration of SIM into the #downlink of a #multiuser #multiple-#input #single-#output (#MISO) #communication #system, where an SIM, consisting of a #multilayer #metasurface #structure, is deployed at the #base #station (#BS) to facilitate #transmit #beamforming in the #electromagnetic #wave #domain. This eliminates the need for conventional digital beamforming and high-resolution #digital-#to-#analog #converters at the BS. To this end, an optimization problem is formulated to maximize the sum rate of all user equipments by jointly optimizing the transmit power allocation at the BS and the wave-based beamforming at the SIM, subject to constraints on the transmit power budget and discrete #phase #shifts. Furthermore, they propose a computationally efficient algorithm for solving the formulated joint optimization problem and elaborate on the potential benefits of employing SIM in wireless networks. ---- Jiancheng An; Marco Di Renzo; Merouane Debbah; Janne H.; Chau Yuen More details can be found at this link: https://lnkd.in/gw42C4-q

𝐇𝐨𝐰 𝐝𝐨 𝐲𝐨𝐮 𝐛𝐮𝐢𝐥𝐝 𝐚 𝐛𝐫𝐢𝐝𝐠𝐞 𝐛𝐞𝐭𝐰𝐞𝐞𝐧 𝐫𝐨𝐨𝐦 𝐭𝐞𝐦𝐩𝐞𝐫𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐦𝐢𝐥𝐥𝐢𝐤𝐞𝐥𝐯𝐢𝐧? ❄️ In this week interview David Gunnarsson CBDO at Bluefors is interviewed by Gilad Ben-Shach. David shares what it takes to build the cryogenic backbone of quantum computing and how Quantum Machines and Bluefors are working together to deliver fully integrated infrastructure for quantum labs around the world. From 80K to just a few millikelvin, Bluefors systems are more than dilution refrigerators they’re precision-engineered “elevators” that carry signals, wiring, and control into the ultra-cold environments where quantum devices thrive. ✅Why cryogenic measurement infrastructure matters ✅How QM QFilter and Q-Cage sample holder complement their stack ✅What’s next: higher cooling power, flexible wiring, and compact systems for scalable integration If you're thinking about the future of quantum system integration, this conversation is worth your time. Watch the full interview here:https://hubs.la/Q03KjV_40 #QuantumComputing #Cryogenics #QuantumInfrastructure #Bluefors #QuantumMachines #HybridControl #QuantumTechnology #SuperconductingQubits #QuantumHardware

Off-shell Photonic Density of States Links Lorentzian Broadening to Exponential Attenuation in Non-Reciprocal Materials Researchers have extended the established understanding of light propagation to encompass near-field effects and unconventional materials, revealing a direct link between light attenuation and the behaviour of light waves near their source and paving the way for advances in technologies like 6G communications and novel photonic devices. #quantum #quantumcomputing #technology https://lnkd.in/efs5XE9A

Photonic Systems Support up to 3D Channels, Predictively Bounding Singular Values for Information Capacity Researchers have established a broadly applicable method to accurately predict the signal strength limits within complex electromagnetic systems, enabling improved design of devices like waveguides, metasurfaces and detectors, and facilitating calculations crucial for information transmission and sensing. #quantum #quantumcomputing #technology https://lnkd.in/ezpuWAtx

Photonic Systems Support up to 3D Channels, Predictively Bounding Singular Values for Information Capacity Researchers have established a broadly applicable method to accurately predict the signal strength limits within complex electromagnetic systems, enabling improved design of devices like waveguides, metasurfaces and detectors, and facilitating calculations crucial for information transmission and sensing. #quantum #quantumcomputing #technology https://lnkd.in/eA_EcjHG

🔬 The project will demonstrate its capabilities through experimental and real-world field trials, integrating physical sensing devices, the intelligent control platform, and network controls to validate performance, reliability, and resilience. 🌐 iconproject.eu #FieldTrials #NetworkInnovation #ResearchImpact

Single- and Two-Photon Drives Sense Weak Anharmonicity Via Critical Point Sensitivity in Optical Cavities Scientists now precisely measure the subtle nonlinear properties of light within optical cavities by monitoring changes in light intensity near a critical point, achieving improved sensitivity and reduced noise through the combined use of single and two-photon light sources. #quantum #quantumcomputing #technology https://lnkd.in/eH66-QQF

Quantum systems that use dilution refrigerators and ultra-low-temperature set ups, require high-density, non-magnetic interconnects with excellent signal integrity at cryogenic temperatures. At HUBER+SUHNER, we offer a full range of non-magnetic SMA connectors and cable assemblies designed specifically for these needs. Our solutions offer key advantages: ✔️Maintaining vacuum in cold environments ✔️Enabling efficient heat transfer ✔️A compact design with low signal loss ✔️Durable performance in extreme cold Learn more about our solutions for quantum computing: https://bit.ly/46wKent #SMA #Connector #RF #Quantum #QuantumComputing