公开(公告)号：MY152705A

公开(公告)日：2014-11-28

申请号：MYPI2010004732

申请日：2010-10-07

Applicant: MIMOS BERHAD

Inventor： KHIR MOHD FARED ABDUL ,  YUSOF ZALHAN MD ,  SAHARUDIN SUHAIRI DR ,  SURYADI DR ,  ZAIN MOHD NOR ZALIMAN MOHD ,  WAHIDDIN MOHAMED RIDZA PROF DR ,  SAARI SAHBUDIN PROF DR

IPC: H04L9/08

Abstract: AN APPARATUS FOR FLIPPING THE POLARIZATION STATE OF AN OPTICAL PULSE BETWEEN A TRANSMITTER (2) AND A RECEIVER (4) IN A QUANTUM KEY DISTRIBUTION SYSTEM COMPRISING: A PASSIVE NON FLIPPING COMPONENT (340) THAT PRESERVES THE POLARIZATION STATE OF SAID OPTICAL PULSE; A PASSIVE FLIPPING COMPONENT (350) THAT ROTATES THE POLARIZATION STATE OF SAID OPTICAL PULSE ORTHOGONALLY; AND AN ACTIVE OPTICAL SWITCH (320) THAT RECEIVES SAID OPTICAL PULSE AND SENDS SAID OPTICAL PULSE TO EITHER THE SAID PASSIVE NON FLIPPING COMPONENT (340) OR THE SAID PASSIVE FLIPPING COMPONENT (350) WHEREBY THE SAID OPTICAL PULSE UPON ENTERING SAID ACTIVE OPTICAL SWITCH (320) IS DIRECTED EITHER TOWARDS THE PASSIVE NON FLIPPING COMPONENT (340) WHERE ITS POLARIZATION STATE IS PRESERVED OR TOWARDS THE PASSIVE FLIPPING COMPONENT (350) WHERE ITS POLARIZATION STATE IS ROTATED ORTHOGONALLY. (FIGURE 4)

公开(公告)号：MY149425A

公开(公告)日：2013-08-30

申请号：MYPI2010005726

申请日：2010-12-02

Applicant: MIMOS BERHAD

Inventor： SURYADI ,  ZAIN MOHD NORZALIMAN BIN MOHD ,  KHIR MOHD FARED ABDUL ,  YUSOF ZALHAN MD ,  SAHARUDIN SUHAIRI ,  WAHIDDIN MOHAMED RIDZA

IPC: H04L9/00

Abstract: THE PRESENT INVENTION PROVIDES A SYSTEM (100) FOR PERFORMING QUANTUM KEY DISTRIBUTION BY SECURELY SWITCHING BETWEEN DETERMINISTIC AND NON-DETERMINISTIC PROTOCOL. THE SYSTEM COMPRISING AT LEAST ONE RANDOM POLARIZATION ENCODED PHOTON SOURCE (102, 104), AT LEAST ONE OPTICAL SWITCH (108), AT LEAST ONE SET OF DETECTOR FOR DETERMINISTIC PROTOCOL (116) AND A SET OF DETECTOR FOR NON-DETERMINISTIC PROTOCOL (122) AND A PLURALITY OF ELECTRONIC LOGIC GATES (118,120). THE SAID RANDOM POLARIZATION ENCODED PHOTON SOURCE (102, 104) COMPRISING ATTENUATED PULSE LASER PUMPS AND OPTICAL COMPONENTS FOR RANDOMLY GENERATING POLARIZATION PHOTON STATES WHILE THE SAID OPTICAL SWITCH (108) HAVING AT LEAST ONE INPUT PORT AND AT LEAST TWO OUTPUT PORTS FOR SWITCHING SINGLE PHOTONS. THE SAID POLARIZATION ENCODED PHOTON FLIPPER (110) RANDOMLY FLIP POLARIZATION STATE OF ENCODED PHOTON WHILE THE SAID DETECTOR FOR DETERMINISTIC PROTOCOL (116) AND DETECTOR FOR NON- DETERMINISTIC PROTOCOL (122) HAVING ACTIVE BASIS SELECTOR (114) AND OPTICAL COMPONENTS FOR MEASURING AND DISCRIMINATING SINGLE PHOTON POLARIZATION STATES AND THE SAID ELECTRONIC LOGIC GATES COMPRISING ELECTRONIC CONTROLLER, TIMER AND ANALYZER (118, 120) FOR CONTROLLING POLARIZATION STATES OF PHOTON TO BE SENT, CONTROLLING OPTICAL SWITCH BASED ON QUANTUM BIT ERROR RATE (QBER), CONTROLLING POLARIZATION ENCODED PHOTON FLIPPER (110) AND CONTROLLING ACTIVE BASIS SELECTOR (114). ANOTHER EMBODIMENT OF THE PRESENT INVENTION PROVIDES A METHOD (200) FOR PERFORMING QUANTUM KEY DISTRIBUTION BY SECURELY SWITCHING BETWEEN DETERMINISTIC AND NON-DETERMINISTIC PROTOCOL. THE METHOD COMPRISING STEPS OF GENERATING RANDOM POLARIZATION ENCODED PHOTONS (202), TRANSMITTING ENCODED PHOTONS TO OPTICAL SWITCH (204), SENDING ENCODED PHOTON TO POLARIZATION ENCODED PHOTON FLIPPER TO FLIP POLARIZATION STATE OF ENCODED PHOTON (206), ROTATING POLARIZATION STATE OF ENCODED PHOTON USING ACTIVE BASIS SELECTOR (208), FORWARDING ENCODED PHOTON TO DETERMINISTIC DETECTOR TO MEASURE POLARIZATION STATE OF ENCODED PHOTON (210), CALCULATING QUANTUM BIT ERROR RATE (QBER) TO DETERMINE TYPE OF PROTOCOL TO BE USED (212), DETERMINING EXCHANGE OF DETERMINISTIC PROTOCOL TO NON-DETERMINISTIC PROTOCOL BASED ON CALCULATION OF QUANTUM BIT ERROR RATE (QBER) (214), SWITCHING ENCODED PHOTON TO NON-DETERMINISTIC DETECTOR WHEN QUANTUM BIT ERROR RATE (QBER) IN DETERMINISTIC PROTOCOL IS GREATER THAN MAXIMUM THRESHOLD VALUE (216) AND PERFORMING ERROR CORRECTION WHEN QUANTUM BIT ERROR RATE (QBER) IS LOWER THAN MAXIMUM THRESHOLD VALUE TO CONTINUE WITH DETERMINISTIC PROTOCOL (226).