Technical Name Source of Biphoton Quantum Light
Project Operator National Tsing Hua University
Project Host 余怡德
Summary
We employed an atomic vapor cell, a practical component, to develop the source of biphoton quantum light. For the first time, we utilized the all-copropagation scheme and developed a high isolation technique. The source's linewidth and spectral brightness are the world records to date. It has a stable frequency with a wide adjustable range, a highly tunable linewidth compatible with various quantum devices, and ultrahigh brightness, leading to a key apparatus in the future quantum communication.
Scientific Breakthrough
For the first time, we utilized the all-copropagation scheme and developed a 130-dB high isolation technique. Our biphoton quantum source has a linewidth down to 290 kHz, the narrowest one of all single-mode sources made of room-temperature or hot media. The spectral brightness of our source is 3.8*10^5 pairs/s/MHz, a world record to date among all kinds of media (hot/cold atoms, crystals, photonic chips, etc.), and is close to the ultimate limit, an important milestone in quantum communication.
Industrial Applicability
Our biphoton quantum source is based on a commercially-available atomic vapor cell. It also includes 2 low-power lasers and a few optical components. The narrow-linewidth source has a world-record spectral brightness. The source's entity is a movable apparatus. It can run uninterrupted 24 hours a day in the environment like a telecom hub nowadays. The superior performances of our source will become the reliable machine in network hubs and play an influential role in quantum communication.
Keyword quantum communication quantum information biphoton heralded single photon quantum light source photonic qubit
Notes
  • Contact
  • Ite A. Yu