Method and apparatus for free-space quantum key distribution in daylight
Abstract
A quantum cryptography apparatus securely generates a key to be used for secure transmission between a sender and a receiver connected by an atmospheric transmission link. A first laser outputs a timing bright light pulse; other lasers output polarized optical data pulses after having been enabled by a random bit generator. Output optics transmit output light from the lasers that is received by receiving optics. A first beam splitter receives light from the receiving optics, where a received timing bright light pulse is directed to a delay circuit for establishing a timing window for receiving light from the lasers and where an optical data pulse from one of the lasers has a probability of being either transmitted by the beam splitter or reflected by the beam splitter. A first polarizer receives transmitted optical data pulses to output one data bit value and a second polarizer receives reflected optical data pulses to output a second data bit value. A computer receives pulses representing receipt of a timing bright timing pulse and the first and second data bit values, where receipt of the first and second data bit values is indexed by the bright timing pulse.
- Inventors:
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1174891
- Patent Number(s):
- 6748083
- Application Number:
- 09/844,176
- Assignee:
- University Of California, The Regents Of
- Patent Classifications (CPCs):
-
H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04B - TRANSMISSION
H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04L - TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- DOE Contract Number:
- W-7405-ENG-36
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Hughes, Richard J., Buttler, William T., Lamoreaux, Steve K., Morgan, George L., Nordholt, Jane E., Peterson, C. Glen, and Kwiat, Paul G. Method and apparatus for free-space quantum key distribution in daylight. United States: N. p., 2004.
Web.
Hughes, Richard J., Buttler, William T., Lamoreaux, Steve K., Morgan, George L., Nordholt, Jane E., Peterson, C. Glen, & Kwiat, Paul G. Method and apparatus for free-space quantum key distribution in daylight. United States.
Hughes, Richard J., Buttler, William T., Lamoreaux, Steve K., Morgan, George L., Nordholt, Jane E., Peterson, C. Glen, and Kwiat, Paul G. Tue .
"Method and apparatus for free-space quantum key distribution in daylight". United States. https://www.osti.gov/servlets/purl/1174891.
@article{osti_1174891,
title = {Method and apparatus for free-space quantum key distribution in daylight},
author = {Hughes, Richard J. and Buttler, William T. and Lamoreaux, Steve K. and Morgan, George L. and Nordholt, Jane E. and Peterson, C. Glen and Kwiat, Paul G.},
abstractNote = {A quantum cryptography apparatus securely generates a key to be used for secure transmission between a sender and a receiver connected by an atmospheric transmission link. A first laser outputs a timing bright light pulse; other lasers output polarized optical data pulses after having been enabled by a random bit generator. Output optics transmit output light from the lasers that is received by receiving optics. A first beam splitter receives light from the receiving optics, where a received timing bright light pulse is directed to a delay circuit for establishing a timing window for receiving light from the lasers and where an optical data pulse from one of the lasers has a probability of being either transmitted by the beam splitter or reflected by the beam splitter. A first polarizer receives transmitted optical data pulses to output one data bit value and a second polarizer receives reflected optical data pulses to output a second data bit value. A computer receives pulses representing receipt of a timing bright timing pulse and the first and second data bit values, where receipt of the first and second data bit values is indexed by the bright timing pulse.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 08 00:00:00 EDT 2004},
month = {Tue Jun 08 00:00:00 EDT 2004}
}
Works referenced in this record:
An autocompensating fiber-optic quantum cryptography system based on polarization splitting of light
journal, March 2000
- Bethune, D. S.; Risk, W. P.
- IEEE Journal of Quantum Electronics, Vol. 36, Issue 3