Performance of single-photons communication using the multi-channel frequency coding scheme

Abstract

In this paper, optical communication at the single-photon level is experimentally demonstrated by using a multi-channel frequency coding scheme in which the information is decoded by using the single-photons modulation spectrum. By using the modulation spectrum, the coding scheme could work normally in a channel with high loss and noise. Besides, multiple modulation frequency components could be used in a wide bandwidth regardless of frequency aliasing; therefore, the multi-channel frequency coding scheme makes it possible for high-capacity single-photons communication.

Quantum Coherent Modulation-Enhanced Single-Molecule Imaging Microscopy

“…The signal-to-background (S/B) ratio in the time domain can be represented as where k S represents photons emitted per second from a single molecule and k B represents photons emitted per second from the background. The S/B ratio in the frequency domain can be described as − where t is the integration time (in s) and ξ is the slope factor of modulation, depending on the interaction strength between the single molecule and the pulse pair (for detailed derivation, see the Supporting Information, section 4). Although the S/B ratio does not change in the time domain once the k S and k B are determined, as given in eq , the R S/B (DFT) can be unlimitedly improved in theory by increasing the integration time, as given in eq .…”