Self-referenced continuous-variable quantum key distribution
| DWPI Title: System for performing self-referenced continuous-variable quantum key distribution, has integrated circuit for identifying phase value of optical pulse, and decoding encoded data based upon phase value of optical pulse |
| Abstract: Various technologies for continuous-variable quantum key distribution without transmitting a transmitter's local oscillator are described herein. A receiver on an optical transmission channel uses an oscillator signal generated by a light source at the receiver's location to perform interferometric detection on received signals. An optical reference pulse is sent by the transmitter on the transmission channel and the receiver computes a phase offset of the transmission based on quadrature measurements of the reference pulse. The receiver can then compensate for the phase offset between the transmitter's reference and the receiver's reference when measuring quadratures of received data pulses. |
| Use: System for performing self-referenced continuous-variable quantum key distribution (CV-QKD) for facilitating generation of secured shared randomness between two communicating parties. |
| Advantage: The system enables separating local oscillator and data signal prior to encoding information on the data signal permitting phase and amplitude modulation components to encode data on the data signal without introducing noise and interference from a high-power local oscillator signal. The system enables increasing precision of amplitude and phase quadrature measurements to permit P-Q space that to be more finely segmented, thus allowing more information to be encoded on a single pulse. |
| Novelty: The system (100) has an integrated circuit placed to receive a first optical pulse and a second optical pulse, where the second optical pulse comprises an encoded data. The circuit generates a single-frequency optical signal, identifies a phase value of the first optical pulse based upon interferometric detection between the single-frequency optical signal and the first optical pulse, and decodes the encoded data based upon the phase value of the first optical pulse. A phase quadrature value and an amplitude quadrature value of the first optical pulse are measured. |
| Filed: 11/17/2015 |
| Application Number: US14943373A |
| Tech ID: SD 13196.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
| Data from Derwent World Patents Index, provided by Clarivate All rights reserved. Republication or redistribution of Clarivate content, including by framing or similar means, is prohibited without the prior written consent of Clarivate. Clarivate and its logo, as well as all other trademarks used herein are trademarks of their respective owners and used under license. |