Abstract: The present disclosure relates to a sensor system sensing a physical quantity. The system includes an excitation source for generating an excitation signal. A sensing volume includes quantum system(s), wherein the sensing volume is arranged to receive the excitation signal. The excitation signal induces an emission and/or an adaption of an optical signal by the sensing volume. A characteristic(s) of the optical signal depends on the physical quantity. An imaging system applies a transformation to the optical signal, thereby generating a transformed optical signal at an image plane. A spatially dependent attenuator is arranged at the image plane and attenuates the transformed optical signal. An optical sensor captures the thus attenuated optical signal and detects an image formed by the optical signal. A processor extracts an information on the physical quantity from the captured image pattern.

Abstract: A sensor system for sensing EM radiation and a method for calibrating the system are provided. The system includes a sensing element that receives calibration signals or signal components with different frequencies. Recording device records responses of the sensing element to at least two calibration signals or signal components. A respective response to a calibration signal of the at least two calibration signals or signal components depends on an excitation of one or more of the resonances by the calibration signal. A part of the recorded responses to and/or information derived from at least a part of the recorded responses is stored in a model which correlates the responses to frequencies and/or signal levels of the corresponding calibration signals or signal components. Processor uses the model to convert a response of the sensing element to an EM signal to be analyzed into a frequency spectrum of the EM signal.

Abstract: The present disclosure relates a quantum sensor system for sensing electromagnetic, EM, radiation. The quantum sensor comprises an element configured to shape and/or focus the EM radiation to generate an inhomogeneous field distribution in an area; at least two quantum sensors which are arranged at different locations in the area, each of the quantum sensors comprising a sensing volume which is configured to interact with the EM radiation; at least one detector configured to detect an interaction of the EM radiation with each sensing volume, wherein the interaction is indicative of a power level of the EM radiation at the location of the respective sensing volume; and a processor which is configured to determine a signal characteristic of the EM radiation based on a correlation of the power levels at the locations of the sensing volumes.

Abstract: The invention relates to a method for device-independent quantum key generation and distribution between a first and a second receiver, the method comprising the steps of: a) Generating an entangled information pair, comprising two entangled quantum moieties that have at least one quantum state entangled with each other, such as a polarization, b) Transmitting a first entangled quantum moiety of the two entangled quantum moieties to the first receiver (A) and a second entangled quantum moiety of the two entangled quantum moieties to the second receiver (B), and measuring the quantum states of the entangled moieties with a set of selected detection settings chosen randomly at each receiver c) In a modification step, assigning each measurement value b1 measured with a detection setting B1 a complementary value b 1 ? according to a noise-probability p, wherein the noise-probability p is larger than 0 and lower than 1, such that a modified plurality of measurement values b 1 ˜ is obtained

Abstract: A system for measuring electromagnetic radiation, comprising at least one light source; a quantum converter arranged to be exposed to radiation emitted by the at least one light source and the electromagnetic radiation, and at least one detector for detecting optical radiation received from the quantum converter. The quantum converter comprises at least a first interaction zone and a second interaction zone, and the system establishes at least a first light beam path for exposing the first interaction zone and a second light beam path for exposing the second interaction zone with radiation emitted by the at least one light source. Each laser beam path is controllable to be in an activated state enabling exposure and in a deactivated state preventing exposure of the respective interaction zone.

Abstract: A system for measuring electromagnetic radiation, including at least one light source; a quantum converter arranged to be exposed to radiation emitted by the at least one light source and the electromagnetic radiation, and at least one detector for detecting optical radiation received from the quantum converter. The quantum converter includes at least a first interaction zone and a second interaction zone, and the system establishes at least a first light beam path for exposing the first interaction zone and a second light beam path for exposing the second interaction zone with radiation emitted by the at least one light source. Each laser beam path is controllable to be in an activated state enabling exposure and in a deactivated state preventing exposure of the respective interaction zone.