Abstract: The technology described herein is directed towards a reconfigurable surface device that reflects an impinging electromagnetic signal, with a phase profile determined by curvature and vertical positioning of a flexible metallic ground plane beneath metallic resonating elements of the reconfigurable surface. The amount of curvature and vertical positioning forms different gaps between portions of the flexible ground plane and the respective metallic resonating elements above those portions, to determine the shape and direction of the reflected beam. In one implementation, four individually linear actuators and four vertical motors are mechanically coupled to the corners of the ground plane of a metasurface (panel). These actuators and motors are controlled to establish the phase profile, by determining the amount of curvature and vertical positioning of the flexible ground pane to shape and/or steer the reflected beam.

Abstract: The technology described herein is directed towards a reconfigurable intelligent surface that receives and redirects incoming electromagnetic signals based on power efficient subarrays of unit cells. Each subarray integrates a power amplifier and tunable delay device to selectively amplify and delay the reflected signal. For example, the power amplifier and tunable delay device is shared by a m×n (e.g., 3×3) subarray of unit cells, which can be arranged as a module of a larger reconfigurable intelligent surface. Proper impedance matching between the power amplifier and the reconfigurable intelligent surface elements is maintained by using a matching circuit to minimize signal reflection. The system design thus provides a device for receiving and reflecting the electromagnetic signal in the same polarization by coupling the RF energy, processing, amplifying, and adding delay to mitigate any interference. The technology facilitates estimation of the angle of arrival of the incoming signal.

Abstract: The technology described herein is directed towards phase-change material-based (e.g., chalcogenide) radio frequency components that can be used in unit cells of a reconfigurable intelligent surface. A tunable device for reconfigurable operation is described, in which the operational width of phase-change material in the conductive state is controlled to controllably vary the phase shift of each unit cell. The width can be selectively controlled by heating elements that change the operational width of the material's lower-resistance state relative to its higher resistance state, resulting in a phase change of a unit cell with respect to redirecting an electromagnetic wave. By arranging the heating elements below the material, and actuating each one to provide resistive or conductive states within the overall unit cell surface, an analog-like device is provided to provide more granular phase shift control of the cells of a reconfigurable intelligent surface.

Abstract: The technology described herein is directed towards remotely controlling the direction and the signal strength of a beam reflected from a reconfigurable intelligent surface. A modular design of interconnected, communicatively coupled fundamental modules of unit cells facilitates a straightforward assembly process in which the aperture of the reconfigurable intelligent surface can be scaled by tiling together the modules. The reconfigurable intelligent surface aperture can be remotely fine-tuned with respect to gain and beam reflection direction upon receiving a control signal (e.g., a nine-bit digital code through infrared). Depending on a given scenario, the reflected beam be controlled to reflect an electromagnetic wave (e.g., mmWave) as a concentrated, high-gain coverage beam in a specified direction, a more expansive, low-gain coverage area beam in the specified direction, or something in between, e.g., medium signal strength and medium coverage area.

Abstract: The technology described herein is directed towards determining a phase shift matrix for an intelligent reflective surface based on active tag-enhanced sensing that provides calibrated orientation data and distance data of the intelligent reflective surface relative to a transmission-reception point, such as a radar system, base station or wireless access point. The calibration data is based on accurate estimation of element distances to the intelligent reflective surface elements. Based on the calibration data, a phase shift matrix for the elements of the intelligent reflective surface is determined. The phase shift matrix can be used in optimizing the intelligent reflective surface for redirected communications with a target. Other calibration data can be obtained at the target for element distances of the intelligent reflective surface relative to the target.

Abstract: The technology described herein is directed towards using a wearable passive metasurface (e.g., configured as a ring) to reflect signals representative of user interaction with computer peripheral devices (e.g., a mouse and keyboard) coupled to a computing device. The reflected signals indicate current user interaction with the device obtained over a timeframe. A short term classifier model set processes features of the user interaction patterns, extracted from time and frequency domain analyses, to recognize activity from the interaction pattern data of a user, as well as detect any deviations from the user's ordinary interaction behavior, possibly indicating a different user. A long term classification model inputs the user interaction pattern data and the recognized activity, to output authentication response data, such as confidence level data, for comparison with a confidence level threshold, to determine via the interaction pattern data whether the user is an authorized user of the computing device.

Abstract: The technology described herein is directed towards determining a phase shift matrix for an intelligent reflective surface based on active tag-enhanced sensing that provides calibrated orientation data and distance data of the intelligent reflective surface relative to a transmission-reception point, such as a radar system, base station or wireless access point. The calibration data is based on accurate estimation of element distances to the intelligent reflective surface elements. Based on the calibration data, a phase shift matrix for the elements of the intelligent reflective surface is determined. The phase shift matrix can be used in optimizing the intelligent reflective surface for redirected communications with a target. Other calibration data can be obtained at the target for element distances of the intelligent reflective surface relative to the target.

Abstract: A reconfigurable thermally actuated transmissive and reflective panel or surface is disclosed. A panel includes a metallization layer that includes unit cells configured to resonate at a desired frequency or range of frequencies. The panel includes a switch layer formed of a metal insulator transition material that is thermally controlled with a refractory heater layer to be in a metallic state or an insulator state. The state determines whether the panel operates in a reflective mode in which incident signals are reflected or a transmission mode in which incident signals are transmitted through the panel. The refractory heater layer, when provided with a voltage, generates heat to heat the switch layer and switch to the metallic state. Removing (or lowering) the voltage allows the temperature of the switch layer to drop until the switch layer transitions to the insulation state and the panel operates in the transmission mode.

Abstract: The technology described herein is directed towards a wearable device that includes a passive metasurface that interacts with a transceiver coupled to a computing device, such as a personal computer or laptop. The transceiver transmits a wireless radio frequency signal towards the metasurface integrated into the wearable device, whereby the metasurface reflects an altered instance of the incoming signal back to the transceiver. The radiation pattern of the reflected signal can be distinctly altered per metasurface, providing a distinct signature of that particular metasurface that can be detected by a computing device expecting that signature. The receipt of an expected, matched signal's signature at the computing device, can, for example, facilitate proximity detection of the user, authentication of the user and so on, in a seamless way that is efficient and secure. Various wearable designs for the devices are described, including rings and wristbands that incorporate metasurfaces.

Abstract: A device for selectively reflecting signals is disclosed. The device may include a flexible reconfigurable intelligent substrate. Different portions or segments of the reconfigurable intelligent substrate can be exposed in an illumination window. Each of the segments has a different phase response. Positioning a particular segment in the illumination window achieves a particular reflection direction. The reflection direction can be tuned manually using a tuning mechanism configured to reposition the reconfigurable intelligent substrate relative to the illumination window.

Abstract: The technology described herein is directed towards monitoring phase noise errors in quantum circuits via a classical (non-quantum) computing device, along with phase control based on the monitoring. A phase shifter, operating at cryogenic temperatures, is deployed between a microwave photon source and the qubits to ensure precise phase alignment. By placing the phase shifter in close proximity to the qubits, the system reduces thermal noise and increases coherence during quantum gate operations, thus improving overall quantum computation performance. The classical computing device monitors the phase of the qubits following qubit interaction with a microwave signal from the photon source, detecting any deviations or noise-induced errors. Based on the monitored phase, the computing device adjusts the phase of subsequent microwave signals in real time via control of the phase shifter to mitigate phase noise, thereby reducing phase drift and noise, which ensures better stability and fidelity of qubit operations.

Abstract: A metasurface unit cell array of a plurality of metasurface unit cells to manipulate reflection of incoming radiofrequency (RF) signals comprising a microcontroller unit executing code instructions of a metasurface hardware geofencing system to identify an angle of arrival of the incoming RF signals from consecutive metasurface unit cells to determine an expected phase delay of the incoming RF signals and to compare it to a measured phase delay of the incoming RF signals from a reconfigurable delay detection network having plural fixed transmission line segments with known capacitance load to identify a phase delay deviation indicating compromised integrity of the incoming RF signals, where each metasurface unit cell includes a reflective pattern structure of conductive material on a substrate, a electromagnetically coupled RF signal probe to detect the incoming RF signals from a voltage line with a substrate integrated waveguide embedded in the substrate.

Abstract: The technology described herein is directed towards using active qubits for quantum circuit execution, in which operations on active qubits are replicated onto spare qubits for purposes of quantum state measurement data integrity verification. Spare qubits are available qubits in a quantum system that are not actively used for executing quantum operations. Via the information measured from the spare qubits, state measurement data integrity can be verified with fewer repeated multiple executions (shots) that use only active qubits. Variable, known amounts of phase shift, rotation and/or delay can be applied to a spare qubit. When measured, the spare qubit measurement data can be evaluated for whether the applied phase shift, rotation and/or delay remained the same following quantum operations; if so, the probability of the measured data being correct is increased. Active qubits can be measured in the Z-basis; spare qubits can be measured in the X-basis and Y-basis.

Abstract: The technology described herein is directed towards a wearable device that includes a passive metasurface of unit cells with a distinct signature corresponding to a physical radiation pattern of signals reflected by the metasurface. The distinct signature facilitates remote management of the metasurface, such as to activate or deactivate the metasurface with respect to a device, system and/or user account. The metasurface interacts with a transceiver coupled to a computing device. The transceiver transmits a wireless radio frequency signal towards the metasurface, whereby the metasurface reflects an altered instance of the incoming signal back to the transceiver. The radiation pattern of the reflected signal is distinct per metasurface, providing a signature of that particular metasurface. When activated, the receipt of an expected, matched signal's signature at the computing device, can, for example, facilitate proximity detection of the user and/or authentication of the user.

Abstract: The technology described herein is directed towards a design and implementation of a reconfigurable surface that reflects an impinging electromagnetic signal, with a phase profile determined by the curvature of a flexible metallic ground plane beneath metallic resonating elements of the reconfigurable surface. The amount of curvature forms different gaps between portions of the flexible ground plane and the respective metallic resonating elements above those portions, thereby determining the shape of the reflected beam. In one implementation, four individually controllable linear actuators are mechanically coupled to the corners of the ground plane of a metasurface (panel). These actuators enable a curvature phase profile, by determining the amount of curvature of a flexible, metallic ground, which allows a reflected beam to be shaped. Compensation for unwanted flex resulting from one or more external stimuli (e.g., motion and/or vibration) is also provided.

Abstract: A system and method for operating a reconfigurable metasurface unit cell array of a virtual line-of-sight (LoS) Wi-Fi sensing system having a reconfigurable metasurface unit cell array to establish a virtual LoS portion of a Wi-Fi wireless link between a transmitter device and receiver device and a reconfigurable metasurface microcontroller unit to receive a Wi-Fi sensing request from the transmitter device. The reconfigurable metasurface microcontroller unit executes to monitor for angle of arrival and time of flight of a target object present within the virtual LoS. The reconfigurable metasurface microcontroller unit to determine a direction and location of the target object within the virtual LoS based and create a beamforming pattern at the reconfigurable metasurface to increase signal propagation of the Wi-Fi wireless link with Wi-Fi sensing to the target object and to report the direction and location of the target object to the transmitter device.

Abstract: Example embodiments and implementations of the technology described herein are generally directed towards integrating a neural processing unit (NPU) within the controller chip of a high-frequency (e.g., millimeter wave or terahertz (THz)) reconfigurable intelligent surface (RIS). The RIS controller and NPU manages RIS functions for signal control and communication management between access points and client devices by leveraging the computational power and efficiency of NPUs, e.g., by running artificial intelligence models directly on-site with the RIS controller. Other example embodiments and implementations of the technology described herein are generally directed towards a high-frequency (e.g., THz) communication system that reduces interference and noise in high-frequency wireless networks utilizing AI-driven optimization.

Abstract: A system and method of mitigating an electromagnetic field (EMF) at a metasurface unit cell array formed on an information handling system includes with a hardware processor executing computer-readable program code instructions of an adaptive mitigation system module to receive received signal strength indicator (RSSI) data from an RSSI sensor, receive signal-to-interference-plus-noise ratio (SINR) data from an SINR sensor, or determine wireless bandwidth requirements at the information handling system, and with a tunable delay circuit, phase shift electromagnetic (EM) waves of a captured, incident radiofrequency signal to create interference patterns in the EM waves of the incident radiofrequency signals with a reflected radiofrequency signal at the metasurface unit cell array to create a null region of reduced EMF on one side of the information handling system for a user and reducing the null region when radiofrequency communication metrics indicate need for increased radiofrequency signal.

Abstract: The technology described herein is directed towards a passive wearable device with a metasurface, such as in the form of a ring or wristband. The wearable device reflects a transmitted scanning signal to a receiver coupled to a computing device, such as for automatic user proximity detection, user authentication and/or other security purposes. In one implementation, unit cells having resonators in the shape of symmetrical concentric rings around a central disk provide a wide-angle, orientation insensitive ultra-thin and compact wearable device. The symmetry of the unit cells results in the orientation insensitivity, (polarization insensitivity in electromagnetic terms), as well as operating generally independent of the angle of incidence of the transmitted scanning signal. In another implementation, the unit cells for passive wearable devices have resonators in the shape of notched rings, which results in a wide-angle, distance insensitive wearable device that is also significantly orientation insensitive.

Abstract: The technology described herein is directed towards a passive wearable device with a metasurface, such as in the form of a ring or wristband. The wearable device reflects a transmitted scanning signal to a receiver coupled to a computing device, such as for automatic user proximity detection, user authentication and/or other security purposes. In one implementation, unit cells having resonators in the shape of symmetrical concentric rings around a central disk provide a wide-angle, orientation insensitive ultra-thin and compact wearable device. The symmetry of the unit cells results in the orientation insensitivity, (polarization insensitivity in electromagnetic terms), as well as operating generally independent of the angle of incidence of the transmitted scanning signal. In another implementation, the unit cells for passive wearable devices have resonators in the shape of notched rings, which results in a wide-angle, distance insensitive wearable device that is also significantly orientation insensitive.