Abstract: The invention relates to a mechanical oscillator device comprising an unsupported membrane with a multitude of discrete mass elements distributed to form Phononic crystal cells in the form of regions of additional mass each comprising a plurality of mass elements. The phononic crystal structure has a defect for confining a mechanical oscillation mode having a resonance frequency, f, with the mass elements have a smallest lateral dimension of less than 1/10 of a wavelength of the mechanical oscillation mode. The invention is based on a distribution of tiny additional mass elements providing a periodic density contrast pattern to create the bandgap. This approach keeps the tensile stress uniform which ensures perfect overlap between the tensile stress distribution and mode-shape. This again reduces the damping and thus allows for very high quality factors, Q.

Abstract: A measurement based photonic quantum computing system includes an optical input generator configured for receiving first optical paired inputs, and second optical paired inputs, inducing a first predefined relative time delay into each optical paired inputs for making one mode of the first and one mode of the second optical paired inputs into coexisting optical inputs, representing a logic level of the quantum computing system, a delocalized measurement architecture configured for optically interfering coexisting optical inputs for generating intermediate outputs, optically interfering by first and second variable path-couplers for each intermediate output a first mode of the intermediate outputs to a second mode of first or second neighboring intermediate outputs, respectively, for generating interfered outputs, and detecting by two optical detectors, preferably homodyne optical detectors, each mode of the intermediate outputs and interfered outputs, such that the delocalized measurement architecture is conf

Abstract: A quantum random number generator includes an entropy source having a laser source, a single photodiode configured for generating photo current based on received light from the laser source, where the photodiode has a non-unity quantum efficiency for allowing interference of the light from the laser source with a vacuum state to obtain entropy from the vacuum state, a transimpedance amplifier to convert the photo current into voltage, an analog-to-digital converter for converting the analog voltage to a digital output, a security proof which establishes a lower bound on the entropy from the vacuum state, and a processing unit configured to convert the digital output from the analog-to-digital converter to random numbers based on the security proof.

Abstract: The present invention relates to a magnetometer (100) using optically detected magnetic resonance (ODMR), where a solid state material (10), such as diamond, with an ensemble of paramagnetic defects, such as nitrogen vacancies centers NV, is applied. An optical cavity (20) is optically excited by an irradiation laser (25) arranged therefore. A coupling structure (30) causes a microwave excitation (?) of the paramagnetic defects, and a permanent magnetic field (40, B_C) causes a Zeeman splitting of the energy levels in the paramagnetic defects. A probing volume (PV) in the solid state material is thereby defined by the spatially overlapping volume of the optical excitation by the irradiation laser (25), the coupling structure (30) also exciting the defects, and the constant magnetic field. The magnetometer then measures an unknown magnetic field by detecting emission (27), e.g.

Abstract: A squeezed light generator (SLG) for generating squeezed light (SQL) is disclosed, said squeezed light generator (SLG) comprising: —a waveguide (WG) being arranged to receive fundamental wavelength laser light (FWL), the waveguide (WG) comprising a second harmonic generator (SHG) for generating second harmonic light (SHL) from the fundamental wavelength light (FWL), —an optical cavity (OC) resonant for both fundamental wavelength light (FWL) and the second harmonic light (SHL), the optical cavity (OC) being arranged to receive the second harmonic light (SHL), and —a parametric down converter (PDC) arranged inside said optical cavity (OC), the parametric down converter (PDC) being adapted for generating said squeezed light (SQL) using said second harmonic light (SHL). Also, a method for generating squeezed light (SQL) is disclosed.

Abstract: A squeezed light generator (SLG) for generating squeezed light (SQL) is disclosed, said squeezed light generator (SLG) comprising: —a waveguide (WG) being arranged to receive fundamental wavelength laser light (FWL), the waveguide (WG) comprising a second harmonic generator (SHG) for generating second harmonic light (SHL) from the fundamental wavelength light (FWL), —an optical cavity (OC) resonant for both fundamental wavelength light (FWL) and the second harmonic light (SHL), the optical cavity (OC) being arranged to receive the second harmonic light (SHL), and —a parametric down converter (PDC) arranged inside said optical cavity (OC), the parametric down converter (PDC) being adapted for generating said squeezed light (SQL) using said second harmonic light (SHL). Also, a method for generating squeezed light (SQL) is disclosed.

Abstract: The present invention relates to a magnetometer (100) using optically detected magnetic resonance (ODMR), where a solid state material (10), such as diamond, with an ensemble of paramagnetic defects, such as nitrogen vacancies centers NV, is applied. An optical cavity (20) is optically excited by an irradiation laser (25) arranged therefore. A coupling structure (30) causes a microwave excitation (?) of the paramagnetic defects, and a permanent magnetic field (40, B_C) causes a Zeeman splitting of the energy levels in the paramagnetic defects. A probing volume (PV) in the solid state material is thereby defined by the spatially overlapping volume of the optical excitation by the irradiation laser (25), the coupling structure (30) also exciting the defects, and the constant magnetic field. The magnetometer then measures an unknown magnetic field by detecting emission (27), e.g.