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Method and apparatus for clock synchronization using quantum mechanical non-locality effects
| Details |
Inventors: Parks, Allen D.; Balchin, Gregory A.; Spence, Scott E.;
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Examiner: Barron, Jr.; Gilberto
Assistant Examiner: Lanier; Benjamin E.
Attorney, Agent or Firm: Thielman, Esq.; Gerhard W., Boalick, Esq.; Scott R., Bechtel, Esq.; James B.
A method for synchronizing a master clock to a slave clock located in master and slave devices communicating with one another via a laser signal beam and a communications channel, each of the devices including a homodyne detector for determining a respective correlation pattern with respect to a phase tuned local oscillator includes steps for recording master and slave correlation patterns while the signal beam cycles between first and second operating modes, transmitting the master correlation pattern and associated first and second times at which the signal beam shifted between the first and second operating modes and between the second and first operating modes over the communications channel, comparing a portion of the master correlation pattern between the first and second times to the slave correlation pattern to thereby determine the time offset between the master and slave correlation patterns, and applying the time offset to the slave clock. A corresponding clock synchronization system is also described. |
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DETAILED DESCRIPTION Based on the above and foregoing, it can be appreciated that there presently exists a need in the art for a clock synchronization method and corresponding apparatus therefor which overcomes the above-described deficiencies.
The present invention was motivated by a desire to overcome the drawbacks and shortcomings of the presently available technology, and thereby fulfill this need in the art.
According to current state-of-the-art aspect, hereafter known as the continuous supply aspect, the present invention provides a method for synchronizing a slave clock to a master clock located in slave and master devices, respectively, communicating from the master system to the slave system via a laser signal beam and a communications channel, each of the master and slave devices including a homodyne detector system for measuring patterns with respect to a phase tuned local oscillator.
These patterns will range in a continuous manner from exhibiting Einstein-Podolsky-Rosen (EPR) correlation patterns to non-correlation patterns.
The process of going from non-correlation to correlation, and back to non-correlation is hereafter known as the V step method.
Advantageously, the continuous supply aspect method includes steps for recording master and slave patterns while the signal (and idler) beam(s) cycle in a V step operating mode, transmitting the slave correlation/non-correlated pattern to the slave system contained by the signal beam and keeping the master correlation/non-correlated pattern contained by the idler beam, comparing a portion of the slave V step correlation pattern to the master V step correlation pattern to thereby determine the time offset between the master and slave correlation patterns, and applying the time offset to the slave clock.
If desired, the variance between the master and slave correlation patterns can be determined in accordance with the expression: V=<[Î/λ)-(g/μ)Ĵ]2> where V is the variance μ is the phase offset associated with a master homodyne detector generating the master correlation pattern corresponding to Ĵ
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Audio Signal Processing 
