Multiple output quantum random number generator

Patent metadata

Field	Value
Publication number	US-9710231-B2
Application number	US-201615144771-A
Country	US
Kind code	B2
Filing date	May 2, 2016
Priority date	May 13, 2015
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A multiple output quantum random number generator coherently measures an optical source noise and outputs a random number sequence based on the independent and coherent measurement of optical source noise. Therefore, it is possible to output a random number sequence at a high speed and to perform multiple outputs.

First claim

What is claimed is:

1. A multiple output quantum random number generator comprising:
an optical hybrid including first and second input ports to which optical source noises are respectively input, the optical hybrid configured to mix a first optical source noise input to the first input port and a second optical source noise input to the second input port and to divide a mixed optical source noise into an in-phase component and a quadrature component;
a plurality of optical detectors configured to respectively convert optical source noises of in-phase components and optical source noises of quadrature components that are output from the optical hybrid into electric noises;
a plurality of analog-to-digital (AD) converters configured to respectively convert electric noises output from the plurality of optical detectors to digital values; and
a random number extractor, including a first channel and a second channel, configured to post-process outputs of AD converters to thereby generate two true random number sequences, and to respectively output the two random number sequences through the first and second channels.

2. The multiple output quantum random number generator of claim 1 , wherein the random number extractor outputs the random number sequences from which biased components of 0s and 1s are removed.

3. The multiple output quantum random number generator of claim 1 , wherein
the first optical source noise and the second optical source noise have the same polarization state;
the random number sequence outputted through the first channel is generated based on an electric noise of an in-phase component sampled by one of the plurality of AD converters; and
the random number sequence outputted through the second channel is generated based on an electric noise of a quadrature component sampled by one of the plurality of AD converters.

4. The multiple output quantum random number generator of claim 3 , further comprising a polarization splitter configured to divide an optical source noise into an X polarized component and a Y polarized component,
wherein an optical source noise output from the polarization splitter is input to at least one of the first input port of the optical hybrid and the second input port of the optical hybrid.

5. The multiple output quantum random number generator of claim 1 , further comprising at least one optical splitter configured to divide an optical source noise,
wherein at least one of two optical source noises divided by the optical splitter is input to the optical hybrid.

6. The multiple output quantum random number generator of claim 5 ,
wherein optical source noises input to the optical splitter are X polarized or Y polarized, and
wherein, in the optical hybrid, two optical source noises divided by the optical splitter are respectively input as a first optical source noise and a second optical source noise.

7. The multiple output quantum random number generator of claim 1 , further comprising:
at least one optical splitter configured to divide an optical source noise; and
a plurality of polarization splitter configured to divide an optical source noise divided by the optical splitter into an X polarized component and a Y polarized component,
wherein the optical hybrid comprises:
a first optical hybrid to which optical source noises of X polarized components respectively output from the plurality of polarization splitter are input; and
a second optical hybrid to which optical source noises of Y polarized components respectively output from the plurality of polarization splitter are input.

8. The multiple output quantum random number generator of claim 7 , wherein the plurality of optical detectors respectively convert an optical source noise of an X polarized in-phase component output from a first optical hybrid, an optical source noise of an X polarized quadrature component output from a first optical hybrid, an optical source noise of a Y polarized in-phase component output from a second optical hybrid, and an optical source noise of a Y polarized quadrature component output from a second optical hybrid into electric noises.

9. The multiple output quantum random number generator of claim 8 , wherein the random number extractor has a plurality of channels including the first and second channels, post-processes the outputs of AD converters to thereby generate a plurality of random number sequences including the two random number sequences, and respectively outputs the plurality of random number sequences through the plurality of channels, the plurality of random number sequences including at least two of
a first random number sequence generated based on an electric noise of an X polarized in-phase component sampled by one of the plurality of AD converters,
a second random number sequence generated based on an electric noise of an X polarized quadrature component sampled by one of the plurality of AD converters,
a third random number sequence generated based on an electric noise of a Y polarized in-phase component sampled by one of the plurality of AD converters, and
a fourth random number sequence generated based on an electric noise of a Y polarized quadrature component sampled by one of the plurality of AD converters.

10. The multiple output quantum random number generator of claim 1 , further comprising at least one light source configured to generate the optical source noise.

11. The multiple output quantum random number generator of claim 10 , wherein the at least one light source comprises a laser light source or a spontaneous emission light source.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Youn Chun Ju
• Choe Joong Seon
• Kim Jong Hoi

Classifications

• G06N99/002

  Physics · mapped topic

• G06F7/588 Primary

  Random number generators, i.e. based on natural stochastic processes · CPC title

• H04L9/0852

  Quantum cryptography (transmission systems employing electromagnetic waves other than radio waves, e.g. light, infrared H04B10/00; wavelength-division multiplex systems H04J14/02; WDM arrangements H04J14/03) · CPC title