NIST researchers have developed a new quantum dot transistor that can count individual photons with high accuracy. The device, called a QDOGFET, uses quantum dots to trap positively charged holes created when photons are absorbed, allowing scientists to measure the number of photons based on the resulting current in the transistor channel.
Key points:
– The QDOGFET can count 1, 2, or 3 photons with 83% accuracy
– It’s the first transistor-based detector to count photon numbers
– Potential applications include quantum key distribution and precision optical metrology
– The device has the potential to operate at higher temperatures than other single-photon detectors
– NIST researchers are working on improving the detector’s efficiency and speed
This breakthrough could enable more advanced quantum technologies by providing a reliable way to count individual photons, a crucial component in many quantum applications.
Source: https://www.nist.gov/news-events/news/2007/10/new-quantum-dot-transistor-counts-individual-photons
Keywords: Photons, Quantum dots, Transistor, Metrology, Detector
