Approaches to single photon detection

Approaches to Single Photon Detection

We present recent results on our development of single photon detectors, including: gated and free-running InGaAs/InP avalanche photodiodes; hybrid detection systems based on sum-frequency generation and Si APDs; and SSPDs (superconducting single photon detectors), for telecom wavelengths; as well as SiPM (Silicon photomultiplier) detectors operating in the visible regime.

Statistical approaches for probing single-molecule dynamics photon-by-photon

The recently developed photon-by-photon approach [H. Yang, X.S. Xie, J. Chem. Phys., 2002 (in press)] for singlemolecule fluorescence experiments allows measurements of conformational fluctuation with time resolution on a vast range of time scales. In that method, each photon represents a data point, thereby affording better statistics. Here, we utilize the information carried by each detected ...

Near-Infrared Single-Photon Detection

Infrared single-photon detection by two-photon absorption in silicon

We propose a scheme for infrared single-photon detection based on two-photon absorption at room temperature in Si avalanche photodiodes, where the detected photon’s energy is lower than the band gap and the energy difference is complemented by a pump field. A quantum nonperturbative model is developed for nondegenerate two-photon absorption in direct and indirect semiconductors yielding proper ...

Atom-atom entanglement by single-photon detection.

A scheme for entangling distant atoms is realized, as proposed in the seminal paper by [C. Cabrillo et al., Phys. Rev. A 59, 1025 (1999)]. The protocol is based on quantum interference and detection of a single photon scattered from two effectively one meter distant laser cooled and trapped atomic ions. The detection of a single photon heralds entanglement of two internal states of the trapped ...