Abstract: A method for training a hybrid quantum-classical computation system for approximating a labeling function for an input feature vector, the system comprising a variational quantum circuit, a machine learning model, and a labeling module configured to receive a first output generated by the variational quantum circuit and a second output generated by the machine learning model and to generate an output label, wherein the method comprises an iterative process comprising providing an input feature vector of the sample dataset, providing the first output and the second output to the labeling module, and determining a parameter update of the variational parameters, the machine-learning parameters, and the trainable combination parameters based on a value of a cost function for the output label for the input feature vector.

Abstract: A system or a method for optical signal amplification includes determining a target operating gain of an optical amplifier; determining a target maximum gain of the optical amplifier; determining an active fiber section length such that the optical signals are amplified with at most the target maximum gain; determining a core cross-sectional area size of the active fiber section based on a maximum allowable pulse shape distortion and a target maximum energy per pulse such that high-energy pulses with the target maximum energy per pulse are distorted by at most the maximum allowable pulse shape distortion; and determining an operating pumping power of the pumping device below the maximum pumping power such that the optical signals are amplified with the target operating gain.

Abstract: A method for quantum key distribution includes determining a ratio between a target maximum gain and a target operating gain of an optical amplifier; determining an active fiber section length such that the optical signals with a target maximum signal power are amplified with at most the target maximum gain; determining an operating pumping power of a pumping device below the maximum pumping power such that the optical signals are amplified with a target operating gain according to the determined ratio between the target maximum gain and the target operating gain; and determining a shared key between a first data processing device and a second data processing device by quantum key distribution comprising amplifying the optical signals via the optical amplifier by operating the pumping device at the operating pumping power.

Abstract: A system and method for encoding a dataset in a quantum circuit for quantum machine learning in a system includes providing a dataset comprising a plurality of input features; for each input feature of the plurality of input features, applying the plurality of encoding quantum gates on one quantum bit (qubit) or a plurality of qubits, wherein each of the plurality of encoding quantum gates rotates the one qubit or the plurality of qubits by a rotation angle which is proportional to the input feature and one of a plurality of scaling factors, each of the plurality of encoding quantum gates is assigned a different one of the plurality of scaling factors, and the plurality of scaling factors comprises powers of two; applying the plurality of variational quantum gates; determining a plurality of measurement values for the qubit; adjusting the quantum circuit; and determining output data.

Abstract: A laser system suitable for modification of a calcified blood vessel includes a laser source; a feedback controller configured to regulate a dosimetry of the laser source to produce spatially and/or temporally modulated laser light; a catheter comprising a first optical delivery element, the first optical delivery element configured to guide the modulated laser light to an in-vivo object in the blood vessel; and a detecting element, configured to detect one or more physical, chemical, mechanical and/or dimensional characteristics of an area of the in-vivo object in real-time, wherein the feedback controller is configured to process the real-time detected information pertaining to the one or more physical, chemical, mechanical and/or dimensional characteristics of the area in real-time, wherein the feedback controller is further configured to regulate the dosimetry of the laser source for a controlled formation of a porous structure and/or a zone of denaturized tissue in the in-vivo object.

Abstract: A ferroelectric nanoparticle capacitor-device comprises a pair of conductive elements electrically insulated from each other, and ferroelectric nanoparticles arranged between the conductive elements of the pair. The ferroelectric nanoparticles are adapted to provide at least three polarization states with different total ferroelectric polarizations.

Abstract: A ferroelectric nanoparticle capacitor-device comprises a pair of conductive elements electrically insulated from each other, and ferroelectric nanoparticles arranged between the conductive elements of the pair. The ferroelectric nanoparticles are adapted to provide at least three polarization states with different total ferroelectric polarizations.

Abstract: A laser system for changing an IOP of an eye includes a laser source; a feedback controller, configured to regulate a dosimetry of the laser source to produce spatially and/or temporally modulated laser light; a first optical delivery element, configured to guide the spatially and/or temporally modulated laser light to irradiate a first area on the eye; and a detecting element, configured to detect one or more physical, chemical, mechanical and/or structural characteristics in a second area on the eye in a real-time during the change of the IOP, wherein the feedback controller is configured to regulate the dosimetry of the laser source in a real-time based on the real-time detected information pertaining to the one or more physical, chemical, mechanical and/or structural characteristics in the second area.

Abstract: A laser system suitable for a treatment of a cartilage tissue in a joint includes a laser source; a feedback controller, configured to regulate a dosimetry of the laser source to produce spatially and/or temporally modulated laser light; a first optical delivery element, configured to guide the spatially and/or temporally modulated laser light to an area in the joint to irradiate a first part of the area; and a detecting element, configured to detect one or more physical, chemical, mechanical and/or structural characteristics in the area in a real-time; wherein the feedback controller is configured to regulate in a real-time the dosimetry of the laser source based on the real-time detected information pertaining to the one or more physical, chemical, mechanical and/or structural characteristics in the area for a controlled activation of a stem cell outside of the first part of the area to form a hyaline cartilage tissue.

Abstract: A system for quantum key distribution includes a first data processing device; a second data processing device; and a transmission line extending between the first data processing device and the second data processing device. The transmission line comprises an inner optical fiber, a shielding layer surrounding the inner optical fiber, and an outer optical fiber surrounding the shielding layer. The first data processing device and the second data processing device are configured to determine a shared key by quantum key distribution via quantum signals along the inner optical fiber. The system is configured to determine outer signal losses along the outer optical fiber.

Abstract: A quantum key distribution device comprises an input signal path receiving a plurality of optical input signals from a transmitter device, an output signal path connected to the input signal path at a first end and emitting a plurality of first optical output signals at a second end, and a detector signal path connected to the input signal path at a third end and comprising a photon detector device at a fourth end opposite to the third end. The photon detector detects optical input signals from the transmitter device, and the quantum key distribution device establishes a shared quantum cryptographic key with the transmitter device based on the detected optical input signals. The input signal path forms an input path of a Mach-Zehnder interferometer, and the output signal path and the detector signal path form output paths of the Mach-Zehnder interferometer.

Abstract: A system method for quantum key includes providing an initial key in a first data processing device and a second data processing device; providing, in the second data processing device, a quantum signal comprising a plurality of quantum states; determining, in the second data processing device, a plurality of quantum measurement parameters, a raw signal by quantum measuring the plurality of quantum states employing the plurality of quantum measurement parameters; generating with the initial key, in the second data processing device, an encrypted signal; determining, in at least one of the first data processing device and the second data processing device, a reconciled signal from the encrypted signal; determining, in at least one of the first data processing device and the second data processing device, a shared key from the reconciled signal by correcting the first reconciled signal.

Abstract: A computer-implemented method includes encoding a QUBO problem in a corresponding QUBO graph problem, wherein each binary variable of the QUBO problem corresponds to a node of the QUBO graph problem and edges between two nodes encode coefficients of terms containing both binary variables corresponding to the two nodes, or receiving a QUBO graph problem in a QUBO graph representation; providing the QUBO graph problem as an input to a trained graph neural network on a processing system; retrieving a predicted performance metric for solving the QUBO problem with a variational quantum solver from an output of the trained graph neural network to the QUBO graph problem provided at the input; and, based on the predicted performance metric, providing the QUBO problem to the variational quantum solver implemented on quantum hardware.

Abstract: A system and method for quantum key distribution includes determining an intrinsic loss along a quantum channel; generating a pulse sequence; transmitting the pulse sequence via the quantum channel; receiving the pulse sequence; determining invalid signal positions and providing the invalid signal positions; determining a first reconciled signal from the first signal and the invalid signal positions, and determining a second reconciled signal from the second signal and the invalid signal positions; determining a total loss along the quantum channel from the at least one test pulse received, determining a signal loss from the total loss and the intrinsic loss, and providing the signal loss; determining a shared by error correcting the first reconciled signal and the second reconciled signal; and determining an amplified key from the shared key by shortening the shared key by a shortening amount that is determined from the signal loss.

Abstract: A method employs a device with a heterostructure as a resonator for electrons of an electrical circuit or for a terahertz electromagnetic wave. The heterostructure comprises at least one dielectric layer and at least one ferroelectric layer. The at least one ferroelectric layer comprises a plurality of ferroelectric polarization domains. The plurality of ferroelectric polarization domains forms a polarization pattern. The polarization pattern is adapted to perform an oscillation with a resonance frequency in a terahertz frequency range. The method comprises functionally coupling the oscillation of the polarization pattern and an oscillation of the electrons of the electrical circuit or of the terahertz electromagnetic wave by the device.

Abstract: A method for natural language processing comprises: receiving a sample comprising natural language; processing the sample, wherein processing the sample comprises generating a plurality of response hypotheses and generating a plurality of confidence values, wherein each response hypothesis is associated with the corresponding confidence value; and selecting a response, comprising selecting the response randomly among the plurality of response hypotheses based at least in part on the corresponding confidence value by utilizing a quantum random number generator.

Abstract: A system and method for authenticating an optical fiber key includes selecting a plurality of at least partially randomized challenge pulse parameters, generating a first optical challenge pulse based on the plurality of at least partially randomized challenge pulse parameters, determining an optical response signal based on a reflected signal of the first optical challenge pulse from the optical fiber key, applying a comparing algorithm the optical response signal and an expected response based on previously recorded optical response signals of the optical fiber key to a reference optical challenge pulse for determining a similarity metric, and authenticating the optical fiber key based on the similarity metric.

Abstract: A superconductor device comprises a graphite structure, a first electrode, a second electrode, and a wrinkle region. The graphite structure comprises at least one topmost atomic layer. The first electrode is arranged over the at least one topmost atomic layer. The second electrode is arranged over the at least one topmost atomic layer and spaced apart from the first electrode. The wrinkle region is comprised in the at least one topmost atomic layer. The wrinkle region is arranged between the first electrode and the second electrode and comprises a plurality of wrinkles with a pair of wrinkles. The first electrode and the second electrode both electrically contact both wrinkles of the pair. A distance between the wrinkles of the pair is at most 0.2 ?m.

Abstract: A method and system for encrypted messaging includes first and second client devices and a quantum key device having a quantum random number generator. The generator provides a first quantum random signal, and the key device provides a symmetric first master key from the first quantum random signal. The master key is transmitted to the first client device and stored. The key device uses the master key to generate an encrypted package by encrypting one of a plurality of keys. The key device generates a second encrypted package. The first pairing key is provided to the first client device by decrypting the first encrypted package using the first master key and providing the first pairing key in the second client device by decrypting the second encrypted package using the second master key to establish an encrypted connection between the first and second client devices.

Abstract: A waveguide device comprises a substrate comprising an electro-optical material; a waveguide formed in the electro-optical material; and a plurality of electrodes formed in a vicinity of the waveguide. The electro-optical material has a first refractive index. The waveguide comprises a plurality of tracks. The tracks comprise a second refractive index smaller than the first refractive index, are parallel to each other with a common direction defining a direction of the waveguide, and form an arrangement in a plane perpendicular to the direction of the waveguide. The arrangement comprises at least 40 equilateral triangles of identical side lengths, wherein all three corners of each of the equilateral triangles each coincide with a different track of the plurality of tracks in the plane perpendicular to the direction of the waveguide.