20240039635. Apparatus And Method For Adjusting The Phase-Modulator's Modulating Signal Time Reference In A Quantum-Key-Distribution System simplified abstract (CENTRE FOR DEVELOPMENT OF TELEMATICS)
Apparatus And Method For Adjusting The Phase-Modulator's Modulating Signal Time Reference In A Quantum-Key-Distribution System
Organization Name
CENTRE FOR DEVELOPMENT OF TELEMATICS
Inventor(s)
Prasanta Halder of New Delhi (IN)
Roshan Lal Sharma of New Delhi (IN)
Atul Kumar Gupta of New Delhi (IN)
Prashant Kumar Rathore of New Delhi (IN)
Apparatus And Method For Adjusting The Phase-Modulator's Modulating Signal Time Reference In A Quantum-Key-Distribution System - A simplified explanation of the abstract
This abstract first appeared for US patent application 20240039635 titled 'Apparatus And Method For Adjusting The Phase-Modulator's Modulating Signal Time Reference In A Quantum-Key-Distribution System
Simplified Explanation
The present disclosure is about an apparatus and method for adjusting the time reference of the phase modulator's modulating signal in a phase-based quantum key distribution (QKD) system. The QKD system consists of a pulse generator that generates optical pulses and a phase modulator that modulates the phase of each pulse.
- The apparatus includes a beam splitter/tap, a 1-bit delay interferometer, two photodetectors, and a processing device.
- The beam splitter/tap feeds the phase modulated optical pulses to the interferometer.
- Two photodetectors are connected to the constructive and destructive output legs of the interferometer.
- The output of the photodetectors is converted to digital signals and sent to the processing device.
- The processing device measures the average power at both legs of the interferometer to detect the delay between the optical signal and modulating signal.
- The processing device adjusts the delay to accurately align the phase modulator with the pulse generator.
Potential applications of this technology:
- Quantum key distribution (QKD) systems
- Secure communication networks
- Quantum cryptography
Problems solved by this technology:
- Accurate alignment of the phase modulator with the pulse generator in a QKD system
- Ensuring the correct timing of the modulating signal for secure communication
Benefits of this technology:
- Improved security in quantum key distribution systems
- Enhanced accuracy in aligning the phase modulator and pulse generator
- Reliable and efficient quantum cryptography
Original Abstract Submitted
the present disclosure relates to the field quantum key distribution (qkd) and discloses an apparatus () and method () for adjusting the phase modulator's modulating signal time reference in a phase-based qkd system. the qkd system comprises a pulse generator () that generates optical pulses and a phase modulator () that modulates the phase of each of the pulses. the apparatus () comprises abeam splitter/tap (), a 1-bit delay interferometer (), two photodetectors (), and a processing device (). the splitter feeds the phase modulated optical pulses to the interferometer (). two photo detectors are connected to the constructive and destructive output legs () of the interferometer (). the photo detectors' output are then converted to digital signals and fed to the processing device (). the processing device () measures the average power at both the legs of the interferometer () to detect delay between optical signal and modulating signal and adjusts the delay to accurately align the phase modulator () with the pulse generator ().
