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Enhancing QKD via Multi-Photon-Lane Systems With a Card-Shuffling-Based Approach
(2025-01-01)
Chaiyasoonthorn, Sawatsakorn
;
Youplao, Pirada
;
Youplao, Phichai
;
Sarapat, Napatsakon
;
Mitatha, Somsak
This paper introduces a modified quantum key distribution (QKD) protocol based on card-shuffling, designed to enhance security against eavesdropper photon number splitting (PNS) strategies. The proposed technique accommodates light pulses with few photons, substantially augmenting the effectiveness and reliability of QKD. It can be implemented as multi-photon-lane systems, enabling concurrent key distribution to multiple users or amalgamation of key data to amplify individual use r key rates. The study assesses the proposed technique utilizing three well-established polarization-encrypted QKD protocols, BB84, B92, and SSP99, and simulations utilizing 4-photon lane systems with wavelengths of 800 nm, 1300 nm, and 1550 nm. The findings, encompassing correlations such as useful key rate, maximum key distribution distance, quantum bit error rate, and photon number probability, are analyzed and compared under different conditions. The outcomes reveal that combining the technique with BB84-based systems employing 1300 nm light pulses and a photon number probability of 1.0 attains a maximum QKD effectiveness of 12.34 Gbit-km/s. Moreover, the effectiveness can be increased to 49.36 Gbit-km/s by implementing the proposed 4-photon-lane system as the serial key-combining scheme. The potential of using multi-photon-lane implementations alongside the proposed technique to enhance the effectiveness and reliability of QKD is theoretically investigated and discussed.
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An Optical Heterodyne Technique for Dynamic Eddy-Current Damping Force Evaluation
(2021-01-01)
Youplao, Phichai
;
Takita, Akihiro
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Nasbey, Hadi
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Mitatha, Somsak
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Fujii, Yusaku
This work presents and discusses a method for evaluating a dynamic eddy-current damping (ECD) force that is automatically generated in response to eddy currents induced within a conductive plate while moving across a magnetic field in relative motion to a nearby stationary magnet. In the experiment, a Doppler shift frequency signal between the optical interference fringe frequencies was used to calculate the velocity of the moving conductive plate. The other relevant mechanical quantities acting on the plate, such as the displacement, acceleration, and resultant force, were then evaluated by performing numerical calculations of the velocity. Finally, the evaluation of the ECD force could be achieved by performing a calculation to remove the frictional force component from the resultant force. Furthermore, an approximation analysis used to calculate the value of the ECD force was proposed and compared with the measured value as well. From the experimental results, the combined standard uncertainty for evaluating the ECD force was approximately 3.57 mN, corresponding to 3.13% of the maximum eddy-current force of approximately 114.0 mN.
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High capacity terahertz frequency combs generated by small scale optical mesh network
(2014-01-01)
Youplao, Phichai
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Pornsuwancharoen, Nithiroth
;
Yupapin, Preecha P.
A novel design of mesh ring resonator system is proposed and simulated to obtain the multi frequency comb bands, in which the frequency band less than 10 GHz (about 0.084 nm) of comb lines spacing with commercialized ring parameters is achieved. The proposed system is used to enhance the capacity of optical frequency comb for redundancy networks against the network element failures and to increase the survivability of the communication systems. The dependence of the mesh ring transmission characteristics with coupling coefficients of directional couplers is analyzed and studied. In application, such a system can be employed as an on-chip optical device for redundancy networks against the network element failures and to increase the survivability of the communication systems. The potential for improving the reliability and availability of the optical networks is discussed. Moreover, the proposed system can also be employed as multi sensing devices, where the microscale, for instance, as an atom/molecule force sensor can be measured by the shifted parameters of the Vernier filters. © 2014 World Scientific Publishing Company.
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Novel multi optical trapping tool generation within add/drop filter system controlled by light
(2011-05-02)
Youplao, Phichai
;
Mitatha, Somsak
;
Yupapin, Preecha
We propose a novel system of multi optical trapping tool using a bright soliton pulses propagating within the add/drop optical filter system. The multiplexing signals with different wavelengths of the bright solition are controlled and amplified within the system. The dynamic behavior of bright soliton interaction is analyzed and described. The signal is controlled and tuned to be an optical probe which can be configured as the multi optical tweezers. By using some suitable parameters, we found that the tweezers widths in add/drop at the drop ports are about 18 nm is achieved. Therefore, the generated multi optical tweezers can be amplified within the design system. In application, the optical tweezers train can be trapped light/atom, which can be transmitted and recovered by using the proposed system.

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