Vital sign monitoring device

Abstract

A vital sign monitoring device includes a single-photon source, a light out-coupling element for coupling light out of the device, a light in-coupling element for coupling light in the device, a controllable delay element to delay light within the device, and a controllable beam splitter. The controllable beam splitter is configured to couple the single-photon source either to the light out-coupling element or to the controllable delay element. The vital sign monitoring device further includes a first photon detector, a second photon detector, and a Hong-Ou-Mandel interferometer. The Hong-Ou-Mandel interferometer has a first input coupled to the controllable delay element, a second input coupled to the light in-coupling element, a first output coupled to the first photon detector, and a second output coupled to the second photon detector.

Dependencies are inferred from the claim text.