Integrated quantum-random noise generator using quantum vacuum states of light
US9965250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2012 |
| Grant date | May 8, 2018 |
| Priority date | — |
| Expiry date | Dec 20, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/1626
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated quantum random noise source includes a substrate, an optical oscillator that may be integral to the substrate coupled by an optical waveguide to an optical directional coupler. The optical directional coupler has two outputs that are coupled by optical waveguides to a pair of photodetectors that are part of a balanced photodetector. The balanced photodetector in response outputs an analog signal proportional to the difference in photocurrents of the two photodetectors. The analog output signal from the balanced photodetector is a random Gaussian-distributed signal representative of quadrature measurements on the quantum vacuum state of light. The random noise source can be coupled other apparatus to provide a source of random bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.