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).

公开(公告)号：MY153911A

公开(公告)日：2015-04-15

申请号：MYPI2010004432

申请日：2010-09-23

Applicant: MIMOS BERHAD

Inventor： HASIM NORSHAMSURI ALI ,  SAHARUDIN SUHAIRI ,  WAHIDDIN MOHAMED RIDZA

IPC: H04L9/08

Abstract: AN APPARATUS AND METHOD (100) FOR DUAL CODING COHERENT PHASE PROTOCOL IN QUANTUM KEY DISTRIBUTION (QKD) SYSTEM USING A COHERENT LASER SOURCE (102), AN INTENSITY MODULATOR (103) AND A PHASE MODULATOR (105) IS DISCLOSED. THE SYSTEM COMPRISES TWO LEVELS OF ENCODING AND SIX TYPES OF DECOY BITS TO FURTHER IMPROVE SECURITY OF THE SECRET KEYS. THE SYSTEM COMPRISES AN INTENSITY MODULATOR FOR INTENSITY CODING WHEREIN A SECRET KEY IS CODED, MEANS TO GENERATE A TRAIN OF PULSES WITH BITS ?1? FOR WEAK COHERENCE PULSE (WCP AND BITS ?0? FOR VACUUM PULSE; AND A PHASE MODULATOR FOR DIFFERENTIAL PHASE CODING COMPRISES THE INTENSITY CODED SECRET KEY FURTHER CODED WITH BITS ?1? FOR PHASE DIFFERENCE OF 0; BITS ?0? FOR PHASE DIFFERENCE OF ? FOR WEAK COHERENCE PULSE (WCP); AND DECOY BITS FOR OTHER ORIENTATION PHASE DIFFERENCE OF VACUUM PULSE AND WCP.