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.