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Photonic Quantum Technology
Investigation of Key Components, QKD Protocol, and System Integration toward Fiber-based WDM Optical Quantum Communication—from Engineering Viewpoint

     The objective of this project is to develop key components, quantum key distribution (QKD) protocol, and system integration of fiber-based optical quantum communication (OQC) system from engineering viewpoints. In sub- project 1, we will develop distributed feedback (DFB) lasers with linewidth below kHz for reducing the quantum bit error rate (QBER). In sub-project 2, low-noise and fast-gating single photon avalanche photodiodes (SPADs) for telecom wavelength will be designed with Ge-on-Si technology. In sub-project 3, metasurfaces are simulated and arranged in OQC system to manipulate photons. In sub-project 4, silicon (Si) and silicon nitride (Si3N4) chip-based quantum photonic integrated circuit (QPIC) components are designed and fabricated. We will also develop QKD simulator to examine the algorithm of different QKD protocol in sub-project 5. In sub- project 6, we will combine all of the key components for constructing the QKD and OQC systems with the currently available fiber-optic networks. 

The 4-channel WDM transmission and receiving OQC network at C-band using the single-/dual-wavelength DFBLD transmitter under master-to-slave seeding control with QKD encryption and decryption

<100-kHz-linewidth Single/Dual/Multi-mode wavelength Injection-locked semiconductor laser quantum-key generator as wavelength decoy single-photon-pulse QKD transmitter and all related devices/modules/circuits/control-loops/sub-systems for linking with the wavelength division multiplexing (WDM) passive optical fiber networks (PON).

Members
  • Co-PI
  • Chao-Hsin Wu (National Taiwan University)
  • Yuh-Renn Wu (National Taiwan University)
  • Guo-Dung Su (National Taiwan University)
  • Ding-wei Huang (National Taiwan University)
  • Jau-Yang Wu (Yuan Ze University)
Technical Highlights
Wavelength Decoy DPS/COW-QKD System Based on Injection-Locked Semiconductor Laser

     The “Wavelength Decoy DPS/COW-QKD System Based on Injection-Locked Semiconductor Laser” technology develops key components required for distributing the single-photon-pulse quantum key and linking the wavelength division multiplexing (WDM) passive optical fiber networks (PON), all self-made key components include

  1.  <100-kHz-linewidth Single/Dual/Multi-mode wavelength Injection-locked semiconductor laser as wavelength decoy QKD transmitter

  2. External or internal encoder with single-photon DPS/COW protocols and high-speed/adiabatic packaging with software PID/HCS hybrid feedback servo loop and driving circuits for precision wavelength/temperature/power/phase control,

  3. Ultra-stable adiabatic polarized 1-bit-delay fiber interferometric decoder, silicon photonic waveguide-typed quantum key transceiver system-on-chip,

  4. Liquid-cooled low-temperature silicon germanium avalanche photodiode single photon detector and driver,

  5. Metasurface polarized entangled-photon fiberized processor Silicon-based QKD integrated photonic circuits and system-on-chip

  6. PEBB84/DPS/COW-protocol simulator, generator, corrector, decoying and anti-attacking software controller interface

Wavelength Decoy DPS/COW-QKD System Based on Injection-Locked Semiconductor Laser

All developed key components including liquid-cooled low-temperature silicon germanium avalanche photodiode single photon detector and driver, ultra-stable adiabatic polarized 1-bit-delay fiber interferometric decoder, silicon photonic waveguide-typed quantum key transceiver system-on-chip, metasurface polarized entangled-photon fiberized processor, silicon-based QKD integrated photonic circuits and system-on-chip, PEBB84/DPS/COW-protocol simulator, generator, corrector, decoying and anti-attacking software controller interface, external or internal encoder with single-photon DPS/COW protocols and high-speed/adiabatic packaging with software PID/HCS hybrid feedback servo loop and driving circuits for precision wavelength/temperature/power/phase control.

References: 

  1. Novel single-photon differential phase-shift keying with asymmetric high-bit-rate coding and low-bit-rate gated receiving coding data format | IEEE Journals & Magazine | IEEE Xplore
  2. O-band single-photon quantum key distributor master-to-slave injection-locked DFBLD pair (optica.org)
  3. Adiabatic weak coherent MHz linewidth O-band single-photon carrier for low erroneous phase decoding (optica.org)